Hi Donna,   I'm not sure where you read about the 4-month restriction. I couldn't find any reference to that here at HealthCentral with a quick search or on any of the reference sites for Atarax and medicines. And if you never had side effects, then that's great!   However, for future reference, what I did learn in researching Atarax is that its active ingredient is essentially the same as that in Zyrtec. The difference is that Atarax is what's considered a first-generation antihistamine, with one of the most common side effects being sedation. On the other hand, Zyrtec is much less likely to cause drowsiness. It is considered a second-generation antihistamine and is now available without a prescription.   But, if you're seldom having hives any more, then it seems unlikely that you need to take any medication on a daily basis, which is great.   To your health, Kathi