Looking for specific pda drug guide

I have used Davis' Drug Guide in my Palm TX for a few years now but one thing bothers me, if I am given a drug name, say Tegretol, it will tell me the name Carbamazepine. However, if I am looking for possible drug names and only know the drug by its name Carbamazepine it will not tell me that it is marketed under Tegretol. I hope I put that clearly enough.

So my question is this: are there any PDA based drug refrence guides which will tell me the marketed name of a drug given its formula name I can purchase? Thanks in advance.

P.S. They also (of course) must have all the other nice nursing goodies such as dosage, implementation, half life, etc. as well.