Although the long-term effects of ecstasy are unknown, ecstasy use has been linked to liver failure and brain damage. There have been several reported deaths since 1988 associated with ecstasy. Most of these deaths were caused by what people were doing at the time they were on the drug. People who take ecstasy in nightclubs may sweat heavily while dancing and lose a lot of their body's water. If they do not drink water to replenish themselves, they may become dehydrated.
Dehydration can cause disorientation, severe fatigue and even fainting.
Heroin Heroin is a highly addictive drug that is popular today. Chronic heroin users need more and more of the drug to get high. Once addicted, trying to stop heroin can cause severe withdrawal symptoms, like muscle cramps, sweating, loss of appetite, diarrhea, intense anxiety, and emotional disturbances. Chronic heroin users who want to quit often require drug rehabilitation treatment. A heroin overdose can be lethal.