The effects of depressants are in many ways similar to the effects of alcohol. Small amounts can produce calmness and relaxed muscles, but a somewhat larger dose can cause slurred speech, ataxia or unstable gait and altered perception. Very large doses can cause respiratory depression, coma and death. The combination of depressants and alcohol can multiply the effects of the drugs, thereby multiplying the risks. The use of depressants can cause both physical and psychological dependence.
Cocaine stimulates the central nervous system.
Its immediate effects include dilated pupils, elevated blood pressure, heart and respiratory rate, and body temperature. Occasional use can cause a stuffy or runny nose, while chronic use can ulcerate the mucous membrane of the nose with long-term use eroding the nasal septum. The injection of cocaine with unsterile equipment can cause AIDS, hepatitis and other diseases. Preparation of freebase, which involves the use of volatile solvents, can result in death or injury from fire or explosion. Cocaine can produce psychological and physical dependency.