The Most Addictive Over the Counter Drugs

4. Motion Sickness Pills

Depending on the type of pills sourced, motion sickness pills contain diphenhydramine (Benadryl) or dimenhydrinate (Dramamine). When taken in large enough doses, users feel high and can experience hallucinations. Based on individual body weight and tolerance, the amount needed to cause these effects varies.

For those who are aiming to achieve this result, some individuals take up to 40 pills at a time. In severe cases, these doses can lead to heart attacks, coma, and death. Long-term abuse results in significant side effects, including memory loss and liver damage.