A person can become addicted to any sort of drug - prescribed, over-the-counter, illegal street or club drugs. Drug abuse is defined as drug use that is excessive or serious enough to interfere with a person's health, relationships with family and friends, work, and finances.
Amphetamines, LSD, cocaine, morphine, and heroin are some of the most commonly abused drugs, but prescription painkillers, anabolic steroids, recreational "club drugs" (e.g., Ecstasy, Speed) can also become addictive and harmful. Any drug, even marijuana, can become a drug of abuse in a susceptible individual and lead to addictive behaviors.
As with other addictions, the causes of drug abuse are not clearly known. Risk factors for drug abuse include heredity, peer pressure, or having an addictive personality. If you suspect that you or someone you care about may have a problem, there are certain signs and symptoms of drug abuse to watch out for. While blood and urine tests may reveal drug use, watch out for neglectful behavior - of family, friends, and responsibilities - as this can also indicate a substance abuse addiction.
Treatment for drug abuse may involve detoxification and help with the symptoms of withdrawal. In a severely addicted person, medical intervention may be the only safe way the individual can stop taking the drug. Stopping cold turkey can lead to serious consequences, including death. Therapy to treat the behaviors surrounding an addiction may also be effective in preventing relapse.