What exactly are medication errors?

Medication errors are preventable events due to the inappropriate use of medications. Medication errors that cause harm are called preventable adverse drug events. If a medication error occurred, but didn't hurt anyone, it's called a potential adverse drug event.

An example of a medication error is taking an over-the-counter product that contains acetaminophen (Tylenol, others) when you're already taking a prescription pain medicine that contains this exact ingredient. This mistake could cause you to take more than the recommended dose of acetaminophen, putting yourself at risk of liver damage.

Another example of a possible medication error is taking a depression medication called fluoxetine (Prozac, Sarafem) with a migraine drug called sumatriptan (Imitrex). Both medicines affect levels of a brain chemical called serotonin. Taking them together may lead to a potentially life-threatening condition called serotonin syndrome. Symptoms of the dangerous drug interaction include confusion, agitation, rapid heartbeat and increased body temperature, among others.