Large doses of cocaine can produce euphoria, severe agitation, anxiety, erratic and violent behaviour, twitching, hallucinations, blurred vision, headaches, chest pains, rapid shallow breathing, muscle spasms, nausea and fever. Overdose can cause seizures, strokes, heart attacks, kidney failure, coma and death. Use is linked with suicides, murder and fatal accidents. A cocaine high can last from 5 minutes to 2 hours. When users crash, they feel very depressed, anxious and irritable.
Many users take repeated doses to maintain the high and avoid the crash.
Some users try to modify the effects or stop binges with drugs like alcohol, tranquilizers or heroin. Effects of Long-term Use Heavy cocaine users can feel depressed, restless, agitated and nervous. They can have sleeping, eating and sexual problems. They can have dramatic mood swings, delusions, hallucinations and paranoia. High blood pressure and irregular heartbeats occur.