Cetirizine is an antihistamine used to treat both seasonal and perennial allergy symptoms such as watery eyes, runny nose (rhinitis), itching eyes, and sneezing. Cetirizine is called Reactine and is available as 10mg and 20mg tablet. Cetirizine 10mg tablet is available without a prescription, however Cetirizine 20mg tablet requires a prescription.
The usual adult dose to treat seasonal or perennial allergy is 10 mg once daily (preferably taken at bedtime). Doses up to 20mg daily can be taken only after consultation with doctor.
Adverse drug reactions may include somnolence or drowsiness, fatigue, malaise, dizziness, dry mouth, diarrhea.
Cetirizine may have minor or moderate influence on the patient's ability to drive and use machines. It may also potentiate the effects of alcohol and CNS depressants (such as sleeping tablets, antidepressants). Use cautiously with these drugs and do not take with alcohol. Also use cautiously if you have any of the following medical conditions: urinary retention, depression, mental disorders, sleep disturbance, seizure, prostate enlargement, kidney or liver disorder.