Some people seem to be annoyed by the OP for questioning the GP (this would be the GP who initially was going to prescribe valium to a 16 yr old what could possibly go wrong there ). Medical treatment is one of the leading causes of death in the western world so everyone should be making more informed decisions and finding out as much as they can about treatment, especially if it is long-term.
"In 1999, Americans learned that 98,000 people were dying every year from preventable errors in hospitals. That came from a widely touted analysis by the Institute of Medicine (IOM) called To Err Is Human. This was the “Silent Spring” of the health care world, grabbing headlines for revealing a serious and deadly problem that required policy and action.
As it turns out, those were the good old days.
According to a new study just out from the prestigious Journal of Patient Safety, four times as many people die from preventable medical errors than we thought, as many as 440,000 a year... With these latest revelations, medical errors now claim the spot as the third leading cause of death in the United States ."
www.forbes.com/sites/leahbinder/2013/09/23/stunning-news-on-preventable-deaths-in-hospitals/
There are some interesting talks and books/articles on problems with the disease/drug model in psychiatry. (A beta-blocker is not a psychiatric drug though so wouldn't come under what these speakers below are talking about, and they might be useful for calming down the symptoms of anxiety which might help reduce anxiety, but still interesting. They shows the questionable nature of some of the claims of biological psychiatry and the disease model of some psychiatric conditions.):
Joanna Moncrieff - The Myth of the Chemical Cure: The Politics of Psychiatric Drug Treatment
There are a few interesting talks by a journalist, Robert Whitaker, who got involved in the area originally when he was interested in helping patients get access to psychiatric drugs. Now he is questioning whether they are useful as long-term treatment (as there seems to be evidence that long-term drug treatment is detrimental for some patients)
Robert Whitaker - Global Psychiatric Epidemic - October 23, 2012 - CPH
[Disclaimter: If people are on psychiatric drugs they should not stop them suddenly as that can have serious consequences]