when to take it – including how many times a day you can take it and when to take it (some types should be taken before bedtime) Undesirable effects are described according to MedDRA System Organ Class and by estimated frequency based on post-marketing experience.

Studies in healthy volunteers show that cetirizine, at doses of 5 and 10 mg strongly inhibits the wheal and flare reactions induced by very high concentrations of histamine into the skin, but the correlation with efficacy is not established.If you forget to give a dose to a child who is taking cetirizine twice a day, you can give the missed dose if it's within 4 hours of when they should have had it.

Cetirizine belongs to a group of medicines called antihistamines - it is an anti-allergy medicine. It stops the effects of a naturally occurring substance called histamine and this helps to relieve the symptoms of allergies such as hay fever and urticaria. Allacan®; Benadryl® Allergy; Piriteze® Allergy; Pollenshield® Hayfever; Sentanase ® Allergy; Ziralton ® Allergy; Zirtek®; Zirtek® Allergy If you're struggling with your hay fever symptoms, ask your pharmacist for advice on different treatment options that may be suitable for you, or use the Boots Hayfever Treatment Online Clinic* Some people have reported that they feel drowsy or dizzy while they are taking allacan ®. If youare affected do not drive or use machines. The apparent volume of distribution is 0.50 l/kg. Plasma protein binding of cetirizine is 93 ± 0.3 %. Cetirizine does not modify the protein binding of warfarin.

Side effects of antihistamines

Most people only need to take an antihistamine for a short while when they have symptoms. You should stop taking cetirizine once your symptoms have eased.