Barbituates and benzodiazipines are drugs that depress the brain and central nervous system. These depressants act as downers and can slow the body and mind down. They have a sedative hypnotic anticonvulsant, or anesthetic effect. They are most commonly found in the form of multi-colored capsules and can be legally prescribed by a doctor to treat disorders like sleeplessness, anxiety, tension, and epileptic seizures.