Tricyclic antidepressants are special anti-depressants that work to calm the brain down. There are different kinds of anti-depressants. Some inhibit certain receptors whereas others work in different ways. They are usually prescribed to a hypnotic patient or someone with a mental illness. They are able to relax their brain with this medicine and combat their disease better.
These are strong potency medicines and can be addictive. This is why they are specially prescribed by doctors and followed precisely to avoid any trouble. These anti-depressants are not available over the counter and need special prescription by the doctor. This exercises certain control over these drugs.