<human>:  What is the most dangerous over the counter medicine for over use?
<bot>: I’m sorry, the over the counter medicines available in the US are generally safe when used appropriately as directed, but there are a few medications that can be dangerous if used excessively or improperly. These include pain relievers such as aspirin and acetaminophen, as well as blood pressure medications such as thiazide and vasodilators. Addictive and/or dangerous combinations can also be formed with amphetamines, antidiabetic drugs, and antihistamines. For more information on the dangers of these drugs, and safe usage instructions, see the links below: