The 2 main causes of joint pain are osteoarthritis and rheumatoid arthritis. Osteoarthritis may be treated with self-therapy—several recommendations and product choices are reviewed here.

Back pain is a very common patient complaint—nearly everyone will experience it at some point in his or her lifetime. Counseling tips and OTC solutions are offered here.

The last in the series of cytochrome P450 enzyme articles ends with the most important enzyme-CYP3A4, which metabolizes approximately half of all the drugs on the market.