Rising prescriptions for psychiatric medications are partly a result of longer-term treatment and increasing population, according to an article by Joanna Moncrieff and Stephen Ilyas in the May, 2012 issue of British Journal of Psychiatry. Psych meds were an increasing proportion of all prescriptions in England between 1998 and 2010. Antipsychotics in particular, both costly and prescribed for uses beyond severe mental illness, are making an increasing contribution to total drug costs.
Moncrieff, J. Ilyas, S. Trends in prescriptions and costs of drugs for mental disorders in England, 1998–2010, British Journal of Psychiatry, May 2012, Vol. 200 (5) 393-398