Different Cles of Drugs?

What are the different cles or drugs? For example, antihistamines, anticoagulants, etc. Are the four types of drugs (stimulants, narcotics, depressants, and hallucinogens) just broad prescription drugs, street drugs, or are they just the general categories that all drugs fit into? Thanks and this is for my own personal knowledge, not school. And if there are like a thousand cles of drugs, just give me a link or something. I wouldn't want you to write them all down, not that you would. Thanks again.