A member asked:

Suffer with chronic hives & angiodema, it comes and goes in cycles, currently active. do singular/zyrtec lose effectiveness after taking for years?

A doctor has provided 1 answer
Dr. John Chiu answered

Not usually: However you may consider increasing the dose of Zyrtec (cetirizine) to 4 x daily if you can tolerate it. Usually it is not the medication which has lost effectiveness but that your hives and angioedema are getting worse. Consult an allergist if increasing the dose of Zyrtec (cetirizine) failed.

Answered 9/28/2016

3.7k views

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