CIMS are one of the well known Medicine DB avail for Doctors. similar to that any public or open source Drug Database avail for research in digital format.
I can not say if NCBI PubChem is a drug database. But if you want to know about individual chemical, you can search at PubChem. It will give you Physical, Chemical and Pharmacological description of any chemical.
You can use "1 mg" app (Formerly known as Health Kart Plus) in your smart phone through Play Store. This app reveals about total information, brand name, price of drugs. You can buy medicines by this app also.