The drugs that fall into this group will give the user more energy. Known as amphetamines, these drugs increase heart rates and can lead to paranoia. Often, the person taking speed will not want to eat. For this reason, many people wanting to lose weight think that they have found the magical cure.
The reality of speed though is much different. Though the abuser will get those things they are seeking such as more energy, they will also begin to lose brain functioning. Eventually, the drive to get more and more of the drug overrides their normal sensibilities. Relationships with family and friends will begin to suffer. Additionally their performance at work will go down rather than up.
Signs that someone is addicted to speed include going without sleep, weight loss, paranoia, and possibly skin breakouts. The abuser may also begin to experience involuntary muscle twitching and grinding of the teeth.
If someone you know has developed an addiction to speed, it is important that they get help immediately. There are many detox centers and drug rehabilitation centers around the world. These facilities allow the addict to withdraw from their addictive substances in a safe environment. Sometimes, they will prescribe drugs to ease the symptoms of withdrawal.
Once the person has gotten the drugs out of their systems, finding a support group is a good idea. Here, the person will learn how to live drug free.

