What causes an overdose on prescription drugs?

It's a chain reaction that begins by taking more of the medication than your body can filter through. Most of the drugs that are overdosed are those that decrease the function of the central nervous system (CNS). When the CNS is inhibited, breathing slows, heart beat slows, and thus oxygen is not put into blood supply and pumped efficiently enough to satisfy the oxygen need for brain functions. Partial overdoses can result in brain damage at various levels. Overdosing, though largely accidental, is a form of suicide.

If you or someone you know is contemplating suicide by overdose, you should contact a professional right away.