This manual gives you essential prescription information about different drugs. For eg. it   tells you why a drug is prescribed, how it should be taken, its side effects, necessary precautions to be taken while taking it, etc.

These drugs are listed by their chemical structure or what is popularly called generic names (eg. the drug Allopurinol is sold with chemists as Zyloric. Here, Allopurinol is the chemical/generic name and Zyloric is the trade name)