It can also cause death by disrupting the brain s control of the heart and respiration . The use of Other Stimulants and Amphetamines can have the same effect as cocaine use, causing increased heart rate and blood pressure which can result in stroke or heart failure . Symptoms include dizziness, sleeplessness, and anxiety. It can also lead to psychosis, hallucinations, paranoia, and even physical collapse . Depressants and Barbiturates can cause physical and psychological dependence that can lead to respiratory depression, coma, and death, especially when used in concert with alcohol .
Withdrawal can lead to restlessness, insomnia, convulsions, and even death .
LSD, PCP, Mescaline, and Peyote are classified as hallucinogens. Hallucinogens interrupt the brain messages that control the intellect and keep instincts in check. Large doses can produce convulsions and coma, heart and lung failure . Chronic users experience persistent memory problems and speech difficulties for up to a year after their use . Because the drug stops the brain s pain sensors, drug experiences may result in severe self-inflicted injuries .