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Can I take Allegra in the morning and Zyrtec in the evening?

Medically reviewed by Drugs.com. Last updated on Nov 4, 2024.

Official answer

by Drugs.com

If your allergy is particularly bad then yes you can take them on the same day, as there are no known interactions. This is a therapeutic duplication and it is usually recommended to take only one antihistamine at any time, however if you have been prescribed to take both together then it is appropriate.

If you do experience any odd symptoms please see your doctor.

You can read more about Allegra and Zyrtec here:
https://www.drugs.com/medical-answers/allegra-zyrtec-difference-3130012/

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Does Zyrtec cause weight gain?

A study has shown that Zyrtec (generic name: cetirizine) is associated with weight gain if taken over the long-term. This may occur because antihistamines can block histamine-1 (H-1) receptors which will increase your appetite. Zyrtec may also cause drowsiness in some people and lower their energy expenditure, causing weight gain.
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