It works really well for me.  It seems to vary significantly from person to person.

Great product! I use Non-Drowsy Claritin Allergy + Sinus 12 hours and I'd do a commercial for the company. It reduces my ragweed symptoms 95%. I can actually sleep at night and function during the day. No more congestion, crazy runny nose, sneezing, itchy red watery eyes, tickling sensation in throat. I have great respect for these people!

-Pat
Montreal, Quebec

It does not work very well and it knocks me out even though it says it is non-drowsy. There are other medications that are far better and will not put you to sleep.

The side effects were much worse than just taking benadryl. Will never use this stuff, again.

Claritin usually works in most case but there are times when, especially when the symptoms are severe, that it just doesn't work. That's when I take Benedryl and sleep the rest of the day.

Claritin has been a life-saver for my kid's skin type allergies without any side-effects. The doctor prescribed sub-linguil tablets that worked quickly and weren't hard to swallow.

I am allergic to cats, and always really bad allergies when I go to my friends house(who has cats). I then took Claritin, and I had no reaction whatsoever. I my mom uses it, and says its the best stuff she has ever used. I also dont experience other aleriges I usally have.

I take MANY allergy meds, all for different symptoms. Claritin works great, no side-affects. You don't even notice it until you stop taking it, THEN you notice how much it worked!

Didn't work for me at all.

Tried it on two separate occasions and it doesn't help at all. No relief for congestion and way too many side effects, inlcuding sleepiness.

My allergies flare up from time to time, and I once was prescribed Claritin to hopefully clear things up. I can't say as this stuff works for me. It may work for some people; I'm just not one of them. Everyone's body make-up is different, which means that everyone's reactions to a certain product are going to be different, as well. Over-the-counter antihistimines (such as Benadryl) do me just fine; I stay busy enough that they don't make me drowsy too much of the time.

It never did anything for me. Zyrtec is far better.

It is the best allergy medicine out there in my opinion. In the Spring time I get allergies very badly and Claritin always came to the rescue. It is no longer prescription and unfortunately it is more costly now and you get less for what you pay.