With drugs for ADHD increasing 17%, and an “unprecedented increase in patients taking antidepressants and antipsychotics,” overall prescription drug sales in the United States reached a record $319.9 billion in 2011 despite downward pressure from the sale of generics. According to ACS Chemical Neuroscience antipsychotic sales grew $2.1 billion from 2010 sales to reach $18.2 billion, an increase of 2.4% in the number of prescriptions that was filled 60% of the time by brand-name rather than generic drugs.
Lindsley, C. The Top Prescription Drugs of 2011 in the United States: Antipsychotics and Antidepressants Once Again Lead CNS Therapeutics. ACS Chemical Neuroscience, 2012, 3(8), pp 630-631
Of further interest:
Record 4.02 billion prescriptions in United States in 2011