Examples: Zyrtec. Check the exact formulation on your label.
Good evidenceActual product examples
Zyrtec Allergy
Cetirizine hydrochloride · 10 mg tablets
An oral antihistamine for allergy itching, sneezing, runny nose and itchy or watery eyes. Generic cetirizine is an alternative.
May cause drowsiness. Kidney or liver disease and other medicines need review. This is not Zyrtec-D, which adds pseudoephedrine.
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What it is useful for
Useful for histamine-related symptoms. Less helpful than nasal steroids for blockage. Can make you sleepy.
Availability: US OTC
When to expect a difference
- Initial effect
- Varies by formulation.
- Full benefit
- No single reliable time applies.
- Use period
- Use only as directed on the product label.
- Stop or ask
- Stop for an adverse reaction and seek advice.
How to use it
- Use one antihistamine at a time unless a clinician advises otherwise.
- Avoid alcohol and review other sedating medicines.
Use the dose on your specific package. Different concentrations and release types are not interchangeable.
Possible downsides
Drowsiness, Dry mouth.
Check suitability
Check allergies, health conditions and all other medicines before use. The finder can flag common restrictions, but it is not a complete interaction checker.
Pregnancy, breastfeeding, children, immune suppression and postoperative care are outside this finder.