In the USA:

"Adverse Drug Events (ADEs) result in more than 2.1 million injuries each year and the Journal of the American Medical Association reported that 100,000 Americans die annually of adverse reactions to prescription drugs"

"The FDA's Office of Drug Risk Assessment calculates only 1% of ADEs are reported."

http://www.centerfordrugsafety.org/PAT_ADEStat.asp

In the UK:

The BMJ's Clinical Evidence website recently stated that only 15% of the 2,404 orthodox medical treatments reviewed were effective and 47% were of unkown effectiveness. www.clinicalevidence.com

Personally, I'd be keeping quiet about the evidence base of medicine, if I were promoting conventional medicine. I'd be keeping still quieter about the evidence base of other disciplines!