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Fortunately, scientists have figured out how to copy the gene that controls the dopamine transporter. By studying copies of the transporter, scientists may learn more about how cocaine affects it -- and how to prevent those effects.

These studies may even lead to the discovery of a treatment for cocaine dependency.

Nerve cells, called neurons, send messages to each other by releasing special chemicals called neurotransmitters.

By attaching to the transporter, the substitute would block the effects of real cocaine.

Anabolic Steroids You may have heard that some athletes use anabolic steroids to gain size and strength.

Most Schedule V drugs are available over the counter.

Taking drugs by injection can increase the risk of infection through needle contamination with staphylococci, HIV, hepatitis, and other organisms.

It may work so hard that it temporarily loses its natural rhythm.