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Research suggests that long-term cocaine use may reduce the amount of dopamine or the number of dopamine receptors in the brain.When this happens, nerve cells must have cocaine to communicate properly.
But while anabolic steroids can make some people look stronger on the outside, they may create weaknesses on the inside.
Normally, once dopamine has attached to a nerve cell's receptor and caused a change in the cell, it's pumped back to the neuron that released it.
But cocaine blocks the pump, called the dopamine transporter.
One of the neurotransmitters affected by cocaine is called dopamine.
Dopamine is released by neurons in the limbic system -- the part of the brain that controls feelings of pleasure.
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Schedule I and II drugs have a high potential for abuse.