most frequently prescribed drugs
Top 100 Most Prescribed, Top Selling Drugs. The hypothyroid medication levothyroxine (Synthroid, AbbVie) continues to be the nation's most prescribed drug, and the antipsychotic aripiprazole (Abilify, Otsuka Pharmaceutical) continues to have the highest sales, at nearly $6.9 billion, according to the latest data from research firm IMS Health.