9. Cough Medicine
The common types of these drugs are Theraflu, Robitussin, and NyQuil, commonly used to treat coughs. However, the drug becomes deadly when taken together with antihistamines, with effects like pronounced sedation states that can lead to accidents.
The common type of this drug is Lanoxin, which is used by patients with heart complications. It becomes dangerous to the user’s health when taken together with quinidine, resulting in vomiting, nausea, and might even cause death.
7. Semi-Synthetic Opioids
The common types of these drugs include Vicodin, Percocet, and OxyContin, used as pain relievers. These drugs become very deadly when taken in excess or when you combine them with cocaine or other related drugs. The user is at risk of accidental overdose.