1. Consumer Healthcare Products Association OTC facts and figures 1998 http:www.ndmainfo.org
2. The safety assessment of over-the-counter (OTC) products;Schmid;Arch Toxicol,1995
3. Off the prescription pad and over the counter: the trend toward drug deregulation grows;Morgan;Can Med Assoc J,1995
4. Use and abuse of over-the-counter analgesics agents;Abbott;J Psychiatry Neurosci,1998
5. The analgesic problem in the Federal Republic of Germany: analgesic consumption, frequency of analgesic nephropathy and regional differences;Pommer;Clin Nephrol,1986