Dr Mercola Here’s a list of the most dangerous legal drugs that even most doctors probably won’t take: 1. Advair (GlaxoSmithKline) Used to treat asthma, Advair contains salmeterol, which can increase the severity of an asthma attack. Salmeterol-based drugs contribute to an estimated 5,000 asthma-related deaths each year in the U.S. alone. 2. Ambien (Sanofi-Aventis)Continue reading “13 most dangerous legal drugs”