Analgesic - Analgesics are a class of medications designed specifically to relieve pain. Codeine, Acetaminophen, etc. are examples of analgesics.

Tranquilizer - Tranquilizers are a class of chemical compounds used for the treatment of stress, and mild or even severe mental diseases. Phenelzine, Iproniazid, Meprobamate etc. are examples of tranquilizers.

Antibiotic - Antibiotics are used as drugs to treat infections because of their low toxicity for humans and animals. Prontosil, Salvarsan etc.are examples of antibiotics.

Antihistamine - Antihistamines medication works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction. Terfenadine, Brompheniramine etc. are examples of antihistamines.