I was really, really drunk. You have the same loss of motor coordination, and you stutter a lot. It is rarely addictive, according to medical texts. Although DXM by itself is unlikely to cause death or serious injury, Dr. Thompson said, large doses can be fatal in combination with antidepressants or prescription nondrowsy allergy medicines, such as Allegra and Claritin. Also, some drugs that accompany dextromethorphan in cold syrups and pills can pose overdose risks.
Antihistamines can cause drowsiness, nervousness and even seizures.
Expectorants, which clear phlegm from the throat and nasal passages, can trigger vomiting. And acetaminophen, the main ingredient in Tylenol, can cause deadly liver damage with prolonged abuse. The huge doses exacerbate the damage. Sabina Stern, program coordinator of the Collin County Substance Abuse Program, has heard of people taking as many as 100 pills in one sitting. Unfortunately, what young people tend to think is that if two pills feel good, four pills will feel great.