November 21, 2012 | Drugs.com released Q3 sales numbers for drug sales in the US today. Proton-pump inhibitors, antipsychotics and statins remain in the top-selling therapeutic categories. Merck's asthma and allergy preventive Singulair predictably drops out of the top five drugs due to Q3 patent loss. For the top 100 drugs, see Drugs.com.