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Zyrtec (Cetirizine)
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Zyrtec

Zyrtec is a strong-active remedy which is taken in treatment and termination of bothersome outdoor and indoor allergy and its symptoms such as sneeze, itching, stuffy, runny nose and red, itchy, watery eyes. Zyrtec also makes great progress in treatment of chronic hives. Zyrtec is safety both for adults and children.

Other names for this medication:

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Also known as:  Cetirizine.

Description

Zyrtec is developed by medical scientists to combat troublesome symptoms of outdoor and indoor allergy. Target of Zyrtec is to control, ward off, terminate and treat outdoor and indoor allergy. Zyrtec operates by making the level of natural chemical histamine lower to ward off outdoor (seasonal) and indoor allergy symptoms. Zyrtec is "non- sedating"antihistamine.

Zyrtec is also known as Cetirizine, Reactine, Alercet, Alergex, Alerid, Certex-24, Cetrine, Cetzine, Cezin, Histazine, Riztec, Ryzen, Triz, Virlix, Xero-sed, Zirtin, Zyrzine.

Dosage

Zyrtec can be taken in tablets (5 mg, 10 mg), syrup (1ml), chewable tablets (5 mg, 10 mg). You should take it by mouth.

It would be better to take Zyrtec every day at the same time.

It is better to take Zyrtec once a day (with or without meals).

Zyrtec of 10 mg works for 24 hours.

Zyrtec can be given to children of 2 years and infants of 6 months. Elderly people who are over 60 years should use Zyrtec lowest dose.

If you want to achieve most effective results do not stop taking Zyrtec suddenly.

Overdose

If you overdose Zyrtec and you don't feel good you should visit your doctor or health care provider immediately. Symptoms of Zyrtec overdosage: extreme sleepiness, confused mental state, weakness.

Storage

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F) away from moisture and heat. Throw away any unused medicine after the expiration date. Keep out of the reach of children.

Side effects

The most common side effects associated with Zyrtec are:

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Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.

Contraindications

Do not take Zyrtec if you are allergic to Zyrtec components.

Try to be careful with Zyrtec if you're pregnant or you plan to have a baby, or you are a nursing mother. Zyrtec can harm your baby.

Try to be careful with Zyrtec usage in case of having kidney or liver disease.

Try to be careful with Zyrtec usage in case of taking cough, cold or allergy medication, depression medication (paroxetine as Paxil, nortriptyline as Pamelor, amitriptyline as Elavil; sertraline as Zoloft, fluoxetine as Prozac, doxepin as Sinequan), medicines for anxiety or sleep (triazolam as Halcion, chlordiazepoxide as Librium, alprazolam as Xanax, diazepam as Valium, temazepam as Restoril).

Try to avoid machine driving.

Zyrtec can be given to children of 2 years and infants of 6 months. Elderly people who are over 60 years should use Zyrtec lowest dose.

If you want to achieve most effective results without any side effects it is better to avoid alcohol.

Do not stop taking Zyrtec suddenly.

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Management of essential thrombocythemia (ET) in high-risk patients is difficult because high platelet numbers can lead to vascular occlusive events and bleeding. Therapeutic interventions in ET are limited to hydroxyurea and anagrelide; however, in Europe, anagrelide is contraindicated in patients with chronic renal disease.

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The present experiments were designed to study the effects of levocetirizine (a potent selective histamine H(1) antagonist) on the contraction induced by histamine on isolated rabbit bronchioles using the precision-cut lung slice technology. Histamine induced a concentration-dependent contraction of isolated rabbit bronchioles (pD(2) value of 5.6). Mepyramine (0.01-1 micromol/l) induced a shift to the right without any decrease in the concentration-response curve to histamine (pA(2) value of 8.2). Levocetirizine (0.03-0.1 micromol/l) induced both a shift to the right and a decrease in the maximal amplitude of the concentration-response curve to histamine (pA(2) and pD'(2) values of 7.9 and 7.0, respectively). The difference between both compounds could be explained in terms of the difference in the dissociation rate from the histamine H(1) receptor coupled to a putative low receptor reserve present in the rabbit bronchioles.

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A prospective medicine usage evaluation based on prescription monitoring was conducted in the medicine OPD of our university teaching hospital to know prescribing trends of different categories of medicines.

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Sensitive enantioselective liquid chromatographic assays using tandem mass spectrometric detection were developed and validated for the determination of S-cetirizine (S-CZE) and R-cetirizine (R-CZE) in guinea pig plasma, brain tissue, and microdialysis samples. Enantioselective separation was achieved on an alpha1-acid glycoprotein column within 14 min for all methods. A cetirizine analog, ucb 20028, was used as internal standard. Cetirizine and the internal standard were detected by multiple reaction monitoring using transitions m/z 389.1 --> 200.9 and 396.1 --> 276.1, respectively. The samples were prepared using protein precipitation with acetonitrile. For guinea pig plasma, the assay was linear over the range 0.25-5000 ng/mL for both S-CZE and R-CZE, with a lower limit of quantification (LLOQ) of 0.25 ng/mL. For the brain tissue and microdialysis samples, the assays were linear over the range 2.5-250 ng/g and 0.25-50 ng/mL, respectively, and the LLOQ values were 2.5 ng/g and 0.25 ng/mL, respectively. The intra- and inter-day precision values were < or =7.1% and < or =12.6%, respectively, and the intra- and inter-day accuracy varied by less than +/-8.0% and +/-6.0% of the nominal value, respectively, for both enantiomers in all the matrices investigated.

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Unsupervised learning: principal component analysis (PCA) and supervised learning: consensus orthogonal partial least squares discriminant analysis (OPLS-DA) were utilized to reveal the essential character of Cetirizine impurity profile; 16 differential impurities were finally found, their structures were speculated by HRMS(2) data.

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Summary Background There are no data directly comparing the relative efficacy of modern H(1)-antihistamines in allergic rhinitis using nasal provocation challenge. Objective We elected to study the comparative effectiveness of usual clinically recommended doses of desloratadine (DES), fexofenadine (FEX), and levocetirizine (LEV), on nasal adenosine monophosphate (AMP) challenge in patients with perennial allergic rhinitis (PAR). Methods 16 patients with PAR were randomized in double-blind cross-over fashion to receive single doses of DES 5 mg, FEX 180 mg, LEV 5 mg, or placebo (PL), with nasal AMP challenge performed 12 h after dosing. Measurements of peak nasal inspiratory flow (PNIF) were made over 60 min after nasal AMP challenge. Results Pre-challenge values (mean+/-SEM) for PNIF (L/min) were not significantly different comparing all groups; DES (129+/-9), FEX (128+/-11), LEV (128+/-13), and PL (128+/-12). The maximum % PNIF fall from baseline over 60 min after nasal AMP challenge was significantly attenuated (P<0.05) compared to PL (50+/-4), with DES (32+/-5), FEX (36+/-4), and LEV (36+/-4). The area under the 60-min time-response curve (%.min) was also significantly attenuated (P<0.05) compared to PL (2110+/-268), with DES (1126+/-285), FEX (1225+/-255), and LEV (1261+/-194). There were no significant differences between the three H(1)-antihistamines for any outcomes. Conclusion DES, FEX, and LEV were equally effective in attenuating the response to nasal AMP challenge. However, further long-term studies will be required to study their comparative effects on nasal symptoms, quality of life, as well as on nasal inflammatory cells.

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According to recent literature, the "anti-allergy" properties of antihistamines are linked to their antagonistic ability on receptor H1. In the majority of experimental models the immediate allergic responses is followed by a late phase. Especially at the pulmonary level, the presence of a late response after an allergic provocation is considered to correlate with the severity of asthma. The reference anti-allergy drugs, such as the inhaled corticosteroids or the cromones, without anti H1 activity, inhibit this late pulmonary response. Azelastine, ketotifen and cetirizine, three substances that are antagonistic to the anti-H1 receptor reduce the late pulmonary response. In addition, these three substances have other "anti-allergy" characteristics. Azelastine inhibits production of superoxide by the pulmonary neutrophils and eosinophils after PAF provocation in animals. Cetirizine significantly inhibits eosinophil infiltration in the bronchoalveolar lavage liquid in asthmatics with a late allergic bronchospasm. The presence of anti-histaminic and anti-allergy characteristics on the same molecule may perhaps convey a supplementary therapeutic benefit in the treatment of allergic symptoms.

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The initiation of the antihistamine effect of a single dose of acrivastine (8 mg) or cetirizine (10 mg) on wheals and itch induced by histamine dihydrochloride (10 mg/ml) in the prick test was studied in a randomized cross-over design employing 20 healthy medical students. The prick test was performed before ingestion of the drug and after 15, 20, 25, 30, 60 and 90 min and 2, 3 and 4 h. Local symptoms (itching) were recorded on a visual analogue scale. The inhibitory effect of acrivastine on the histamine wheal was first noticed 20 min (p < 0.01) after ingestion of the drug and that of cetirizine after 60 min (p < 0.001). The maximum effect of cetirizine, at 4 h, was greater than that of acrivastine, at 3 h (p < 0.001). The suppression of itching was first noticed 25 min after ingestion with both drugs.

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Following a single 10-mg oral dose of cetirizine dihydrochloride to 24 healthy volunteers, the analyte was quantified in human plasma. Protein precipitation using acetonitrile (ACN) was followed by reversed-phase liquid chromatography and tandem mass spectrometry. The MS/MS method was optimised using a PE Sciex API 2000 triple quadrupole mass spectrometer in selected reaction monitoring (SRM) mode, using electrospray with positive ionisation. Oxybutynin was used as the internal standard. The assay method represents a robust, high-throughput, highly specific and sensitive quantitative assay procedure, with 0.5 ng/ml being the lowest plasma concentration that could be reliably quantified. The procedure involves minimal sample preparation, and is well suited to clinical studies of the drug involving large numbers of generated samples. Pre-dose as well as post-dose samples up to and including 48 h were quantified, and the data generated were used to determine the pharmacokinetic profile of the drug.

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Bradykinin, 10 to 1000 micrograms given by aerosol into the nasal cavity of normal, healthy volunteers, produced a dose-related increase of nasal airway resistance. Bradykinin also reduced the minimal nasal cross-sectional area (Amin), increased albumin release into nasal lavage fluid and increased the symptoms of nasal inflammation. Pretreatment with cetirizine (10 mg orally) reduced the fall in Amin induced by bradykinin, 300 micrograms, but not by bradykinin, 100 micrograms. Pre-treatment of the subjects with the H1 histamine receptor antgonist cetirizine (10 mg, orally) or terfenadine (60 mg, orally) 3 h before bradykinin administration caused significant reduction of the bradykinin-induced increase in nasal airway resistance in the upper range of bradykinin doses (300-1000 micrograms) but not in the lower range (10-100 micrograms). Cetirizine reduced the albumin release into the nasal airway and the symptoms induced by bradykinin, 1000 micrograms. Following nasal challenge with bradykinin 300 micrograms or 1000 micrograms, no increase could be detected in the histamine content of nasal lavage fluid. Isolated human nasal cells released histamine in response to bradykinin, 33 and 100 microM, anti-IgE and calcium ionophore, A23187. We conclude that the actions of bradykinin in the human nasal airway are, in part, accounted for by the release of histamine.

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H(1)-antihistamines are first line treatment of chronic urticaria, but many patients do not get satisfactory relief with recommended doses. European guidelines recommend increased antihistamine doses of up to 4-fold.

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Allergic rhinitis affects 20 million of people in United States and a higher figure all around the world.

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The warm acupuncture in both summer and winter achieves the definite efficacy on AR and the effect mechanism is relevant with reducing serum IgE level.

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The synthesis and potential H1 receptor antagonistic activity of two novel series of condensed 2-arylaminoethylpyrimidin-4(3H)-ones (4, 5) and 4-amino-2-arylaminoethyl pyrimidines (6) have been reported. All the novel compounds were found to antagonize histamine in a competitive and reversible manner. When tested on guinea-pig ileum, compounds exhibited H1-antagonistic activity, (pA2 values) in the range of 8.6 to 9.7. Some of the lead compounds were evaluated by an in vivo method and were found to protect the guinea pigs against the histamine induced asphyxic shock at the doses comparable to or lower than those of the standard drugs, cetirizine (CAS 83881-51-0) and terfenadine (CAS 50679-08-8). The pA2 acetylcholine values of some of the lead compounds reflect about 1000-fold selectivity for histamine (H1) receptors. The 4-aminopyrimidines (6) were found to be more selective than their 4-one analogs (4, 5). In the radioligand binding study, one of the lead compounds, 6e, was found to bind reversibly at the histamine H1 receptor with the K1 value of 1.3 mumol/l and IC50 of 3.8 mumol/l. The lead compounds were found to have negligible sedative potential when tested in vivo. An indirect type of molecular modeling approach, using temelastine (CAS 86181-42-2) as the standard ligand, indicates that the potent activity of 4, 5 and 6 may be due to the increased spacer chain length between the pyrimidine nucleus and the side-chain aromatic ring.

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There is some evidence suggesting that factors other than autoantibodies to FceRI or IgE and histamine released from mast cells may play a role in skin autoreactivity that characterizes many patients with chronic urticaria (CU) and, possibly, in the pathogenesis of this disease.

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A dissolution test for a once daily combination tablet containing 10 mg of cetirizine dihydrochloride (cetirizine HCl) for immediate release and 240 mg of pseudoephedrine hydrochloride (pseudoephedrine HCl) for extended release was developed and validated according to current ICH and FDA guidelines. The cetirizine HCl is contained within an outer layer of the tablet while a semipermeable membrane of cellulose acetate and polyethylene glycol controls the rate at which pseudoephedrine HCl is released from the tablet core. The dissolution method, which uses USP apparatus 2 with paddles rotating at 50 rpm, 1000 ml of deaerated water as the dissolution medium, and reversed-phased HPLC for quantitation, was demonstrated to be robust, discriminating, and transferable. These test conditions were selected after it was demonstrated that the cetirizine HCl portion of the tablet rapidly dissolved in aqueous media over the physiologically relevant pH range of 1.1-7.5, and that the extended-release profile of pseudoephedrine HCl was independent of dissolution conditions (i.e., apparatus, pH, and agitation).

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The aim of the following study was to characterize a passive systemic anaphylaxis rat model of dinitrophenyl (DNP)-induced plasma extravasation in the trachea to determine if the model is appropriate for the evaluation of new drugs targeting airway mast cells by oral and intratracheal (i.t.) route. To this purpose we have used fluticasone and a range of anti-allergic drugs including compounds either active on mast cell activation, such as cromoglycate and the Syk inhibitor R406, or active on mast cell mediators, such as cetirizine and montelukast. To further characterize the model, the effect of fluticasone, cromoglycate and R406 on rat tracheal mast cell degranulation was also assessed histologically. DNP-induced tracheal plasma extravasation was inhibited by cromoglycate (i.v. and i.t.) and R406 (p.o.), but not by fluticasone (i.t.), cetirizine or montelukast (p.o.). Cromoglycate and R406 also showed inhibition of tracheal mast cell degranulation, whereas fluticasone was inactive. These results suggest that the DNP-induced tracheal plasma extravasation model constitutes a useful animal model for the evaluation, by oral and i.t. route, of new anti-allergic drugs intended to target airway mast cells.

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A total of 240 male Swiss mice, 10 weeks of age were synchronized for 3 weeks by 12 h light (rest span)/12 h dark (activity span). Different doses of cetirizine were administered orally at fixed times during the day to determine both the sublethal (TD(50)) and lethal (LD(50)) doses, which were, respectively, 55 +/- 0.35 and 750 +/- 0.40 mg/kg. In the chronotoxicologic study a single dose of cetirizine (DL(50)) was administered to comparable groups of animals at six different circadian stages [1, 5, 9, 13, 17, 21 h after light onset (HALO)].

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The efficiency of wastewater ozonation for the abatement of three nitrogen-containing pharmaceuticals, two antihistamine drugs, cetirizine (CTR) and fexofenadine (FXF), and the diuretic drug, hydrochlorothiazide (HCTZ), was investigated. Species-specific second-order rate constants for the reactions of the molecular, protonated (CTR, FXF) or deprotonated (HCTZ) forms of these compounds with ozone were determined. All three compounds are very reactive with ozone (apparent second order rate constants at pH 7: kO3,pH7 = 1.7·10(5) M(-1)s(-1), 8.5·10(4) M(-1)s(-1) and 9.0·10(3) M(-1)s(-1) for CTR, HCTZ and FXF, respectively). Transformation product (TP) structures were elucidated using liquid chromatography coupled with high-resolution tandem mass spectrometry, including isotope-labeled standards. For cetirizine and hydrochlorothiazide 8 TPs each and for fexofenadine 7 TPs were identified. The main TPs of cetirizine and fexofenadine are their respective N-oxides, whereas chlorothiazide forms to almost 100% from hydrochlorothiazide. In the bacteria bioluminescence assay the toxicity was slightly increased only during the ozonation of cetirizine at very high cetirizine concentrations. The main TPs detected in bench-scale experiments were also detected in full-scale ozonation of a municipal wastewater, for >90% elimination of the parent compounds.

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Although all kinds of medications should be avoided during pregnancy, the majority of pregnant women receive at least one drug and 6% of them during the high-risk period of the first trimester. The aim of the present paper is to discuss the appropriate management of rhinologic and laryngeal conditions that may be encountered during pregnancy. A literature review from Medline and database sources was carried out. Related books and written guidelines were also included. Controlled clinical trials, prospective and retrospective studies, case-control studies, laboratory studies, clinical and systematic reviews, metanalyses, and case reports were analysed. The following drugs are considered relatively safe: beta-lactam antibiotics (with dose adjustment), macrolides (although the use of erythromycin and clarithromycin carries a certain risk), clindamycin, metronidazole (better avoided in the first trimester), amphotericin-B (especially in immunocompromised situations during the second and third trimester) and acyclovir. First-line antituberculous agents isoniazid, ethambutol, pyrazinamide, and ciprofloxacine in drug-resistant tuberculosis can be also used. Non-selective NSAIDs (until the 32nd week), nasal decongestants (with caution and up to 7 days), intranasal corticosteroids, with budesonide as the treatment of choice, second generation antihistamines (cetirizine in the third trimester, or loratadine in the second and third trimester), H2 receptor antagonists (except nizatidine) and proton pump inhibitors (except omeprazole) can be used to relieve patients from the related symptoms. In cases of emergencies, epinephrine, prednisone, prednisolone, methylprednisolone, dimetindene and nebulised b(2) agonists can be used with extreme caution. By contrast, selective COX-2 inhibitors and BCG vaccination are contraindicated in pregnancy. When prescribing to a pregnant woman, the safety of the materno-foetal unit is considered paramount. Although medications are potentially hazardous, misconceptions and suboptimal treatment of the mother might be more harmful to the unborn child. Knowledge update is necessary to avoid unjustified hesitations and provide appropriate counselling and treatment for pregnant women.

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A primary culture of human nasal epithelial cells (HNECs) was generated from nasal polyps. After stimulation of epithelial cells with LTA, double-stranded RNA (dsRNA), and LPS, reverse transcription-polymerase chain reaction (RT-PCR) was performed at 1, 6, and 24 h to clarify the optimal stimulation of ICAM-1 in HNECs. To investigate the anti-inflammatory effects of LCEZ, HNECs were pretreated with three different concentrations of LCEZ (500, 50, and 5 nM) for 2 h. HNECs were washed and then stimulated with dsRNA. At 1, 6, and 24 h after stimulation, the level of ICAM-1 was measured by RT-PCR and ELISA. Western blots for TRIF and RIP were performed.

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The histaminergic neurotransmitter system is currently under investigation as a target for drug treatment of cognitive deficits in clinical disorders. The therapeutic potential of new drugs may initially be screened using a model of histaminergic dysfunction, for example, as associated with the use of centrally active antihistamines. Of the selective second generation antihistamines, cetirizine has been found to have central nervous system effects. The aim of the present study was to determine whether cetirizine can be used as a tool to model cognitive deficits associated with histaminergic hypofunction.

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Acupuncture plus rescue medication (RM) (cetirizine) (n = 212), sham acupuncture plus RM (n = 102), or RM alone (n = 108). Twelve treatments were provided over 8 weeks in the first year.

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Population analysis predicts a linear increase in cetirizine CL/F and V/F with age, with CL/F being slightly lower in female children, relative to males of the same age. However, this gender difference probably has no clinical consequences. Since V/F increased more rapidly with age than CL/F, a nonlinear increase in half-life was seen, from < 4 h in infants to near the adult value at 12 years of age. The current recommended dosing regimens that younger children should receive lower but more frequent doses, are confirmed by the present analysis.

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A total of 360 patients with perennial allergic rhinitis were randomized in a placebo-controlled, dose-finding study comparing three concentrations (0.06%, 0.125%, and 0.25%) of a cetirizine nasal spray, administered three times a day for 2 weeks. The primary criterion of efficacy was the percentage of days with no or only mild symptoms of rhinitis (PDMax1), as evaluated by the patients. The median PDMax1 were 16.7%, 30.8%, 42.9%, and 26.7% for the placebo, 0.06%, 0.125%, and 0.25% groups, respectively. Although the global comparison among the four groups only approached statistical significance (P = 0.076), the difference (26.2%) between the placebo and 0.125% groups was clinically and statistically significant (P = 0.011). For the global evaluation by the investigator, the best results were seen in the 0.125% group (P = 0.03). The occurrence of adverse events did not differ among the four treatment groups and consisted mainly of nasal events, occurring in 22.5%, 17.1%, 12.9%, and 24.4% of the patients for the placebo, 0.06%, 0.125%, and 0.25% groups, respectively (P = 0.184). These results indicate that the 0.125% concentration is significantly better than placebo and offers the best therapeutic ratio.

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Following the end of the treatment, the effect of the antihistamines on skin reaction was subsiding in such an order: after 24 hours in case of loratadine and desloratadine, after two days for both doses of fexofenadine, and 3-4 days for cetirizine and levocetirizine.

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Eight children (3.84 +/- 1.17 years old) received a single oral 5 mg cetirizine dose (0.32 +/- 0.07 mg.kg-1) as a 10 mg.ml-1 solution, 1.73 (+/- 0.64) hours before a minor surgical intervention (mean duration +/- SD = 0.90 +/- 0.25 h). Seven venous blood samples were collected before administration (t0) and 0.5 h, 1.5 h, 4 h, 8 h, 12 h and 24 h after dosing, and urine samples were collected up to 24 hours after the dose. The mean +/- SD kinetic parameters were: peak plasma level (Cmax) 607 +/- 231 micrograms.l-1 reached in 1.93 +/- 1.39 h (tmax), elimination half-life (t1/2) 5.55 +/- 0.98 h, area under the plasma concentration time curve (AUC0-infinity) 4,772.1 +/- 1,318.4 micrograms.l-1.h, mean residence time (MRT) 8.13 +/- 1.31 h, apparent plasma clearance (Cl/f) 1.27 +/- 0.80 ml.min-1.kg-1, apparent volume of distribution (Vz/f) 0.60 +/- 0.38 l.kg-1. Urinary recovery was 38.4 +/- 9.9% (n = 4) of the dose. Renal clearance was 0.42 +/- 0.10 ml.min-1.kg-1 (n = 6). No influence of age on the cetirizine parameters was evidenced among this group, except for MRT (p < 0.05) which decreases with age. When compared with results in adults, elimination half-life (t1/2) was twice as short and apparent clearance twice as great. These results suggest that a higher dosage b.i.d. may be required in children.

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Nine asthmatic, rhinitis patients showed statistically significant lung function decreases versus only two of the asthmatic non-rhinitic and none of the controls. No buy zyrtec patient had any clinically significant asthma exacerbation.

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In groups I and II IDT reactivity was reduced at the end of first week (p<0.05). After buy zyrtec drug discontinuation the reactivity almost returned to baseline at the end of the 2-week period, with the exception of the prednisolone group for D.farinae .

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fexofenadine is clinically effective in the treatment of seasonal allergic rhinitis and chronic idiopathic urticaria for which it is a suitable option for first-line therapy. Comparative data suggest that fexofenadine buy zyrtec is as effective as loratadine or cetirizine in the treatment of seasonal allergic rhinitis. In those with excessive nasal congestion the combination of fexofenadine plus pseudoephedrine may be useful. In clinical trials fexofenadine is not associated with adverse cardiac or cognitive/psychomotor effects.

discount generic zyrtec 2015-04-07

The aim of the current study was to investigate the involvement of tryptase and protease-activated receptor-2 (PAR2 buy zyrtec ) in the pathogenesis of itch using a recently developed murine model of atopic dermatitis (AD) elicited by epicutaneous sensitization with ovalbumin (OVA). We also examined whether tacrolimus exerts an antipruritic effect. Epicutaneous sensitization of BALB/c mice with OVA led to a significant increase in the number of scratches. Notably, PAR2 mRNA and protein levels as well as cutaneous levels of tryptase were significantly enhanced in epicutaneously sensitized mice. Pretreatment with the protease inhibitor, leupeptin, PAR2 antibody, and tacrolimus significantly reduced the number of degranulated mast cells and tryptase content, and consequently alleviated scratching behavior. Cetirizine (10mg/kg) exerted a significant inhibitory effect on the scratching behavior of mice, but did not affect the number of degranulated mast cells and induction of tryptase. Our results collectively suggest that tryptase and PAR2 are involved in OVA allergy-induced scratching behavior.

medicine zyrtec 2017-12-22

The efficacy of cetirizine dihydrochloride, a new H1-antagonist with minimal sedative or anticholinergic side effects was evaluated in 30 patients with chronic idiopathic urticaria. In the first part of the study, cetirizine 10 mg and placebo were compared in a double-blind cross-over trial. In the second part, patients who did not respond adequately in the first part were randomized, still double-blind, to receive 10 mg cetirizine either once daily or twice daily. In the first part, treatment was discontinued by 17 patients on placebo and two patients on cetirizine because of lack of efficacy. Cetirizine dihydrochloride was found significantly to reduce occurrence of weals, erythema and pruritus compared with placebo (P less than 0.001). buy zyrtec Twenty-six of the patients improved on cetirizine and two on placebo. Mild sedation was noted by two patients on cetirizine and by one on placebo.

d dose zyrtec 2017-06-25

Efficiency of cetirizine--a new antihistaminic agent--was evaluated in 61 patients with seasonal rhinitis buy zyrtec in placebo-controlled double-blind trial. Patients were randomly divided into subgroups. Cetirizine significantly inhibited the symptoms of allergic rhinitis and conjunctivitis. Adverse reactions were similar to those of placebo. Increased clinical efficiency but also an increase in adverse reaction incidence were noted when the drug was administered in the evening and not in the morning. High efficacy of placebo is worth mentioning. Therefore, antihistaminic agents should be tested in placebo-controlled double-blind trials.

cetirizine zyrtec dosage 2015-09-06

The goal of the study was to isolate and analyze a cetirizine degradation product, formed within a PEG-containing formulation buy zyrtec and to elucidate the mechanism of oxidation of cetirizine.

zyrtec gel caps 2017-02-26

We compared the efficacy and safety of 5 mg cetirizine (CTZ), 120 mg pseudoephedrine retard (PER) and their combination (COM), given twice daily for three weeks, for the treatment of perennial allergic rhinitis. Two hundred and ten evaluable patients (97 males and 113 females) were included in the study and randomly allocated to one of three treatment groups, each of 70 patients. Nasal obstruction, sneezing, rhinorrhoea, nasal and ocular pruritus were scored each day throughout the study by patients using a symptom scale ranging from 0 (no symptom) to 3 (severe). The mean proportion of days without symptoms was higher in the COM group (11.8%) than in the CTZ (6.8%) and PER (5.1%) groups, but the differences were not statistically significant. The mean percentage of days when symptoms were absent or at most mild was significantly higher in the COM group (64.8%) than in either CTZ (45.5%; p = 0.003) or PER groups (40.6%; p = 0.0001). In addition, evaluation of symptoms by investigators and their global evaluation at the end of treatment showed statistically significant differences in favour of COM compared, to both CTZ and PER. The most buy zyrtec frequent adverse events were somnolence in the CTZ and COM groups (8.6% and 12.9%, respectively) while insomnia was most frequent in the PER group. No clinically significant abnormalities were found in haematological or biochemical tests. These results indicate that the combined treatment was more effective than and as well tolerated as treatment with each individual agent.

zyrtec 7 tablet 2015-04-27

Recently, several authors have suggested an off-label increase of antihistamine dosage should be given to patients with chronic urticaria (CU) not responding to the usual, recommended doses, in order to gain better control of the disease. However, this recommendation is not evidence-based. The objective of this study was to assess the effectiveness of increased doses of antihistamines in patients with CU showing poor control at recommended doses. In total, 22 adult patients with moderate/severe CU not controlled with the usual antihistamine doses were studied. These subjects recorded urticaria severity on a visual analogue scale (range 0-10) for 2 weeks. During the first week, they were treated with cetirizine at the licensed dose (10 mg/day), and with a three-fold increased dose (10 mg x 3/day) during week 2. Only 1 patient (5%) responded satisfactorily to the increased dosage of antihistamine; in the remaining 21 subjects, urticaria scores did not change, and these patients had to be treated with steroids, ciclosporin, and in 1 case with cyclophosphamide. Disease control was eventually gained in all cases. This study suggests that the proportion of patients with severe CU that may buy zyrtec gain a better control of their disease with high, off-label doses of antihistamines is probably small, and that most patients will eventually have to undergo more aggressive treatments.

zyrtec drug ingredients 2017-07-24

A literature review was performed using MEDLINE (1966-October 2005), with no time or language restrictions. Key words or phrases used were histamine, antihistamine(s), first- and second buy zyrtec -generation, allergic rhinitis, chronic idiopathic urticaria, quality of life, impairment, sedation, cost-effectiveness, astemizole, cetirizine, desloratadine, diphenhydramine, fexofenadine, loratadine, hydroxyzine, ketotifen, and mizolastine. Additional references were found in the bibliographies of the articles cited.

zyrtec maximum dosage 2016-03-04

LCZ 5 mg p.o. induced no statistically significant changes, neither in the mean values of all P100 parameters, nor in the mean latency of N75 and N135 components. No unilateral or bilateral alterations of VEP parameters were detected, suggesting that LCZ has no influence on the buy zyrtec functional integrity of visual sensorial pathway.

d generic zyrtec 2017-07-31

A double-blind cross-over study was performed in 12 healthy female volunteers comparing cetirizine di-HCl (10 mg) and sustained release dexchlorpheniramine maleate (6 mg) with respect to attentuation of histamine-induced skin buy zyrtec wheals and subjective central nervous system (CNS) effects. Cetirizine was significantly more effective than dexchlorpheniramine in suppressing the size of wheals from 2 to 24 h after drug administration. In fact, at 24 h cetirizine was still as effective as 2 h after ingestion. Ten subjects receiving dexchlorpheniramine reported subjective symptoms relating to CNS depression, in contrast to only one subject given cetirizine.

zyrtec allergy medication 2017-12-16

A number of prescription and nonprescription nonsedating antihistamines are available for the treatment of allergic rhinitis. From a managed care perspective, determining the extent to which a medication conversion to desloratadine from loratadine, fexofenadine, or cetirizine results in maintained or increased patient satisfaction with allergy care would be informative for formulary decision makers and other budget holders. To that end, a survey was undertaken of patient medication Zanaflex 2mg Tab assessments after a switch in antihistamines. On average, patients who converted to desloratadine from loratadine, fexofenadine, or cetirizine reported increased satisfaction with desloratadine treatment.

zyrtec 3 tablets 2016-01-24

The pooled sample contained 294 patients. Compared with placebo, patients in the levocetirizine group experienced an additional mean 6.5 (95% CI 3.8, 9.3) pruritus-free days per month (p < 0.001). Considering only direct medical costs, the incremental cost of treatment with levocetirizine was totally offset by the reduction in other medical costs (i.e. reduced cost of additional medications, medical procedures and hospitalisations). From the perspective of society, treatment with levocetirizine was Hyzaar Medicine cost saving, with a net gain of Euro 91.93 per patient per month.

zyrtec reviews 2016-05-09

To evaluate the time of occurrence of 95% inhibition of histamine-induced wheal and Chloromycetin Tab flare after administration of fexofenadine hydrochloride, 180 mg, or cetirizine, 10 mg.

zyrtec 25 mg 2016-08-03

A total of 600 patients were included in the study comprising of 339 (56.5%) males and 261 (43.5%) females. The data were recorded within the OPD by a registered pharmacist on a medicine usage evaluation form, approved by The University Institutional Review Board (IRB Motilium Drug ).

zyrtec generic target 2015-08-28

The present study compares Cipro Generic Name the sedative effects of three doses of mequitazine on actual driving, psychomotor performance and memory with those of a first- and a second-generation antihistamine.

zyrtec toddler dosage 2015-04-02

Both levocetirizine and cetirizine significantly attenuated the histamine-induced increase in nasal airway resistance by nearly 50% (from a median resistance of 2.51 Pa per cm3/s to 1.29 and 1.31 Pa per cm3/s, respectively) at the maximal concentration, and they concomitantly increased the histamine threshold by fourfold (from 8 to 32 mg Cialis Extra Dosage /ml), compared with placebo. Sneezing was also attenuated by both levocetirizine and cetirizine. However, these antihistaminic effects were not seen with dextrocetirizine.

zyrtec drug information 2015-11-27

Cetirizine is indicated for the treatment of allergic conditions such as insect bites and stings, atopic and contact dermatitis, eczema, urticaria. This investigation deals with development of a novel ethosome-based topical formulation of cetirizine dihydrochloride for effective delivery. The optimised formulation consisting of drug, phospholipon 90 G™ and ethanol was characterised for drug content, entrapment efficiency, pH, vesicular size, spreadability and rheological behaviour. The ex vivo permeation studies through mice skin showed highest permeation flux (16.300 ± 0.300 µg/h/ Zofran Odt Dose cm(2)) and skin retention (20.686 ± 0.517 µg/cm(2)) for cetirizine-loaded ethosomal vesicles as compared to conventional formulations. The in vivo pharmacodynamic evaluation of optimised formulation was assessed against oxazolone-induced atopic dermatitis (AD) in mice. The parameters evaluated were reduction in scratching score, erythema score, skin hyperplasia and dermal eosinophil count. Our results suggest that ethosomes are effective carriers for dermal delivery of antihistaminic drug, cetirizine, for the treatment of AD.

zyrtec off brand 2016-06-24

Three known muscarinic antagonists were used to validate the system. Atropine had a pA2 of 9.4 +/- 0.1 (n = 9). 4-DAMP and methoctramine had pA2 values of 8.6 +/- 0.1 and 5.6 +/- 0.1, respectively (n = 12, 11) all consistent with inhibition of an M3 subtype muscarinic receptor. The rank order of potency of the antihistamines against the inhibition of M3 receptors was desloratadine = diphenhydramine > hydroxyzine (pA2; 6.4, 6.2, 4.8, respectively). pA2 values for fexofenadine, loratadine and cetirizine were not determined since they had no effect on the cholinergic response at the highest drug concentrations tested (10, 10 and 100 microM, respectively). The pA2 values for the antihistamines against the histamine response could not be calculated, but the estimates of the rank order Mestinon Syrup of potency were estimated to be desloratadine > cetirizine approximate to hydroxyzine > fexofenadine > loratadine > diphenhydramine.

zyrtec 300 mg 2015-12-19

Allergen-specific conjunctival challenge (ASCC) is a safe Altace Buy and reproducible experimental model of allergic conjunctivitis and a useful tool in the evaluation of effectiveness and possible mechanisms of action of drugs commonly used in the treatment of allergic diseases.

zyrtec d review 2015-04-23

Children treated with probiotic mixture achieved a significant improvement of symptoms (p < 0.005), and QoL ((p < 0.001). Placebo group had worsening of symptoms (p < 0.005) and QoL Amoxil Overdose Symptoms (p < 0.001). The use of rescue medications was overlapping in the two groups. The intergroup analysis showed that probiotic mixture was significantly superior than placebo for all parameters.

zyrtec generic name 2015-09-15

This multicenter, double-blind trial randomized adults with SAR, sensitized to at least 1 grass allergen, to receive levocetirizine, 5 mg, or placebo once daily in the evening for 2 weeks. The primary end point was the 24-hour reflective Total 5-Symptom Score (T5SS; sum of rhinorrhea, sneezing, nasal congestion, and nasal and ocular pruritus) during the entire treatment period. Secondary assessments included the Rhinoconjunctivitis Quality of Life Questionnaire (RQLQ), Work Productivity and Activity Impairment-Allergy Specific (WPAI-AS) questionnaire, and Epworth Sleepiness Scale (ESS), each assessed at week 1, week 2, and the Voltaren Y Alcohol end of treatment.

double dose zyrtec 2017-07-28

Cetirizine is a new selective H1-antagonist. In a double-blind and placebo-controlled study, 11 subjects underwent a conjunctival provocation test (CPT) with a grass pollen extract to determine the effect of cetirizine on allergen-induced itching and redness of the eye. Results of CPTs Antabuse 200 Mg were reproducible, as no difference was observed between the CPTs performed without any pre-treatment and the CPTs after placebo. Compared to placebo, cetirizine administered orally (10 mg twice a day for 4 days) and in double-blind fashion increased the conjunctival reaction threshold (P less than 0.004) by inhibiting both redness and itching of the eye. Cetirizine should protect patients against allergic conjunctivitis.

zyrtec de10 mg 2017-11-07

To evaluate the effect and safety of acupuncture therapy on patients with moderate to severe allergic rhinitis.

zyrtec 75 mg 2017-12-21

The effects of nasal administration of increasing doses of exogenous substance P have been studied in patients with allergic rhinitis treated with placebo or with the H1 antagonist cetirizine (10 mg twice daily for 3 days). Responses to substance P were assessed by posterior rhinomanometry (measuring nasal airway resistance) and by measure of histamine, protein and albumin production and cell recovery in nasal lavage fluids before and after challenge. Substance P induced a dose-dependent increase in nasal airway resistance which was similar after treatment with either cetirizine or placebo (maximal increase in nasal airway resistance was 4.2-fold greater than the baseline with the placebo and 4.7-fold greater than the baseline with cetirizine). No histamine release was observed. Similar increases in protein and albumin production were observed after stimulation with substance P along with the placebo (protein: from 0.35 +/- 0.11 to 3.31 +/- 0.62 mg and albumin: from 0.09 +/- 0.04 to 2.08 +/- 0.39 mg) and when combined with cetirizine treatment (proteins: from 0.42 +/- 0.09 to 3.62 +/- 0.77 and albumin: from 0.17 +/- 0.04 to 2.19 +/- 0.51 mg). After stimulation with substance P, percentages of neutrophils recovered in nasal fluids increased from 26.2 +/- 11.5 to 54.5 +/- 9.5 with the placebo and from 35.5 +/- 11.0 to 53.6 +/- 9.5 with cetirizine. Eosinophils were inconsistently found after substance P stimulation during both treatments. In conclusion, nasal response to substance P is not modified by cetirizine which suggests that the effect of substance P is not secondary to histamine release in the nose in man.

zyrtec pill picture 2017-12-19

Drug pharmacokinetics and pharmacodynamics may be altered in the elderly. An important contribution is made by decreased renal function, but biotransformation in the liver may also play a role. Commonly prescribed dermatological drugs such as methotrexate and cetirizine are likely to be eliminated more slowly in the elderly and potentially hepatotoxic drugs such as itraconazole and acitretin should be used with caution. Altered drug distribution as a result of body composition changes can lead to prolonged half-life or higher plasma concentrations of many drugs. Higher prevalence of adverse drug reactions and multidrug regimens, and large interindividual variability in drug response make drug dosage and administration in the elderly challenging. New immunobiological agents such as alefacept, efalizumab and etanercept, which are approved for treatment of psoriasis, seem to be as well tolerated in the elderly as in younger patients. A recommended approach when prescribing drugs to the elderly would be to start with a small initial dose and to reduce the number of drugs administered simultaneously. It is crucial to simplify the drug regimen as much as possible in order to enhance drug management in the elderly. To improve pharmacotherapy in the elderly, we review age-related changes in pharmacokinetics that are likely to play a role in dermatological practice.

zyrtec and alcohol 2016-11-11

After indoor aerobic exercise on a treadmill, physical examination revealed facial flushing and numerous pinpoint translucent vesicles covering her abdomen. The diagnosis of miliaria crystallina was made. Given the intense pruritus she experienced with the lesions, she was prescribed cetirizine, 10 mg once daily. However, she noted no improvement with her exercise-induced miliaria. At follow-up 1 year later, her miliaria symptoms had spontaneously resolved with no sequelae observed.

zyrtec dosage infants 2017-02-18

In chronic intractable diarrhea, colonic or duodenal biopsy specimens may appear unremarkable on routine hematoxylin-eosin staining, but increased mast cells may be demonstrated by immunohistochemistry for mast cell tryptase, with the novel term mastocytic enterocolitis describing this condition. Similar increases in mast cells are not apparent in control populations or in patients with other specific diseases that cause chronic diarrhea. The cause of the increased mast cells remains to be elucidated.