What are the Side effects of illegal drugs?

The side effects vary by the drug, its dosage, the frequency of use, and the metabolism of the individual user. The euphoria or improved mental state afforded by drugs are the reason for their use (as it is for Alcoholic Beverages). However, there are likewise residual and unintended effects on the body.

These conditions can include headaches, insomnia, amnesia, blurred vision, loss of appetite (or excessive appetite), lack of concentration, moodiness, irritability, and general lethargy. Other physiological effects can include muscle spasms, abdominal pain, kidney dysfunction, liver damage, irregular heartbeat, or unstable blood pressure. These are separate from other accidental forms of injury that may also be caused while "under the influence."