The suicide inducing effects of certain medical drugs has been well documented, so it really shouldn't come as a surprise, but unfortunately few people know that some drugs, especially psychiatric drugs such as antidepressants, cause a condition called "suicidal ideation," a state in which the person on the drug fixates on thoughts of suicide and may actually commit suicide.
What was expected to be an outpatient procedure put Beck in the hospital for five days, with doctors offering a medicine cabinet's worth of drugs to ease his pain. The drugs made him hallucinate and briefly suicidal, Beck said. "By Saturday night if they had come into my room with a handgun and said, `OK, we can give you some more medication or take this gun and blow your head off' ... I would have honestly taken the handgun at that point and ended it." (read the article)
Pharmaceutical companies are forced to publish the side effects of their drugs, so next time you see an ad for a drug in a magazine or newspaper go find the list of side-effects. If you look hard enough and use a magnifying glass, you'll see them. Of course, at that point you have to wade through the carefully worded medical-speak that is used to hide the horrendous side effects these drugs have.
For more information check this page: Side Effects of Psychiatric Drugs