Antihistamines may oppose the effect of histamine (used to treat leukaemia) and are not recommended for people having this treatment. Antihistamines may also oppose the effect of betahistine (used to treat Ménière's disease) so this medicine is probably best avoided by people taking betahistine.

Or you may need to take it regularly to prevent symptoms – for example, to stop hay fever during spring and summer. What if I forget to take it? Treating allergies such as hay fever, pet allergies and dust mite allergies (seasonal and perennial allergic rhinitis). Undesirable effects are described according to MedDRA System Organ Class and by estimated frequency based on post-marketing experience. Summary of Product Characteristics: Ziralton Allergy Relief for Children 5mg/5ml Oral Solution. Pinewood Laboratories Limited. Revised September 2016. if you are allergic to cetirizine dihydrochloride, to any of the other ingredients (listed in section 6), to hydroxyzine or to any piperazine derivatives (closely related active ingredients of other medicines).Summary of Product Characteristics: Allacan 10mg tablets. Bristol Laboratories Ltd. Revised July 2014. Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Zyrtec only for the indication prescribed. No dose adjustment is needed in patients with solely hepatic impairment, however caution should be exercised and dose adjustment is recommended in patients with hepatic and renal impairment (see Patients with moderate to severe renal impairment table above). Contraindications Summary of Product Characteristics: Benadryl Allergy Children's 6+ 1mg/ml Oral Solution. McNeil Products Ltd. Revised May 2010.

Intranasal antihistamines may be used concomitantly for patients with episodic, perennial, and/or seasonal allergic rhinitis. Treating a chronic itchy nettle-type rash where the cause isn't known (chronic idiopathic urticaria). After discontinuation of cetirizine, pruritus (intense itching) and/or urticaria have been reported. Although cetirizine is a non-sedating antihistamine, occasionally some people may find it makes them feel slightly sleepy. Make sure you know how this medicine affects you before doing potentially hazardous activities such as driving, riding bikes or operating machines. If you do find this medicine makes you sleepy you should avoid drinking alcohol or using other medicines that cause drowsiness with it, as this could make any sleepiness or reduced alertness worse. Asthma Our Asthma service is ideal in emergencies when you are unable to visit your own doctor and need your inhaler urgently. It is designed for emergencies and not regular use and requires you to have add a recent asthma review.Hepatic impairment: Patients with chronic liver diseases (hepatocellular, cholestatic, and biliary cirrhosis) given 10 or 20 mg of cetirizine as a single dose had a 50 % increase in half-life along with a 40 % decrease in clearance compared to healthy subjects.

feeling sleepy and tired – try a different non-drowsy antihistamine. If this does not help, talk to your doctor. Summary of Product Characteristics: Benadryl One a Day Relief tablets 10mg. McNeil Products Ltd. Revised September 2011. The convenient liquid form of Zirtek Allergy Relief Solution offers a practical and easy-to-administer option. Its measured dosage cup ensures accurate and precise intake, making it suitable for adults and children aged 2 years and above. No more struggling with hard-to-swallow tablets or capsules—simply pour and consume the required amount to begin your journey towards uninterrupted comfort.Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told taken together. Therefore, as it is the case with all antihistamines, it is recommended to avoid taking

Children aged 2 to 5 years should be given one 2.5ml spoonful (the small end of a medicine spoon) twice a day. Your dose needs may change if you switch to a different brand, strength, or form of this medicine. Avoid medication errors by using exactly as directed on the label, or as prescribed by your doctor. Get emergency medical help if you have signs of an allergic reaction to Zyrtec: hives, difficult breathing, swelling of your face, lips, tongue, or throat. The terminal half-life is approximately 10 hours and no accumulation is observed for cetirizine following daily doses of 10 mg for 10 days. About two third of the dose are excreted unchanged in urine. 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.In a placebo-controlled study, cetirizine given at the high daily dose of 60 mg for seven days did not cause statistically significant prolongation of QT interval.