Prominent among harmful prescribed drugs are tranquillisers, anti-depressants, pain-killers and steroids. If you value your health you should avoid taking these potentially harmful pharmaceuticals (some of which are obtainable without prescription) unless they are absolutely necessary, because the adverse side-effects of the drugs, including possible addiction, are frequently far worse than the health problem for which they are being taken. - ALWAYS check out the possible side-effects and bear in mind that drug companies have a track record of not disclosing unfavourable information about their products if they can get away with it.
You can read about some of the many dangerous prescription drugs on these pages:
http://www.wildeaboutsteroids.co.uk/story.html - my 'political' page