Drug classifications that have no FDA approved medical uses are hallucinogens and inhalants. Hallucinogens are a class of drugs that cause hallucinations, while inhalants are vapors from toxic substances inhaled to reach a quick high.
The rest of the drugs are used to treat certain conditions. Stimulants speed up the messages between the brain and the body. Some of them are used to treat depression. Depressants have the opposite effect - they reduce stimulation. For example, they can be used to treat insomnia and anxiety. Anabolic steroids are synthetic variations of testosterone. They can be used to treat hormone problems in men, delayed puberty, and muscle loss from some diseases.
