How much antihistamine can i take in 24 hours

Answer

Thanks for your question! While taking Zyrtec-D every day for a short period of time (1 to 2 weeks) is generally considered to be safe for most individuals, there are some concerns with very long-term use.

We have to remember here that Zyrtec-D contains two drugs:

• Cetirizine
• Pseudoephedrine

Cetirizine is a second-generation antihistamine, similar to Claritin (loratadine) and Allegra (fexofenadine) while pseudoephedrine is a nasal decongestant.

Antihistamines like cetirizine are fine to take long-term and extended use isn't thought to cause any negative consequences.

Pseudoephedrine does have some concerns with long-term use and is really only intended to be used for a short period of time to help alleviate symptoms that may be caused by an acute illness (like a cold) or allergies.

Long-term use of pseudoephedrine shouldn't cause any kind of addiction, dependence, or 'rebound congestion'.

The concern lies more with the fact that nasal decongestants, in general, are associated with cardiovascular risk, in addition to som

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