Many of cocaine's effects on the heart are actually caused by cocaine's impact on the brain -- the body's control center.
Schedule I drugs are available for research only and have no approved medical use; Schedule II drugs are available only by prescription (unrefillable) and require a form for ordering.
Schedule III and IV drugs are available by prescription, may have five refills in 6 months, and may be ordered orally.
Without the drug, the brain can't send enough dopamine into the receptors to create a feeling of pleasure.
If a long-term user of cocaine or crack stops taking the drug, the person feels an extremely strong craving for it, because without it he or she can't feel nearly as much pleasure.
They can also permanently stop bones from growing in teenagers.
This means that a teenage steroid user may not grow to be his or her full adult height and will be shorter for life.
Cocaine Cocaine causes the body's blood vessels to become narrow, constricting the flow of blood. It forces the heart to work harder to pump blood through the body.
(If you've ever tried squeezing into a tight pair of pants, then you know how hard it is for the heart to pump blood through narrowed blood vessels.) When the heart works harder, it beats faster.
Most Schedule V drugs are available over the counter.