Claritin is a brand name for the drug loratadine and comes in a 10 mg dosage. (Same as Alavert, I believe.) Claritin-D is loratadine (an antihistamine) mixed with pseudoephedrine (a decongestant).

Besides, that's not really what I meant when I said "over-the-counter". I was referring to that fact that Claritin and Claritin-D used to be prescription-only medications a few years ago.

I do like those RediTabs, though! Really easy and convenient to take, as long as you can pop the darn thing out of its blister pack.