It is wise to know more about the drugs prescribed to you by physicians and there are various ways you can get them. Here are some of the ways:

Leaflets that accompany prescription drugs

Most prescription drugs, if you get it in the manufacturer's package, will contain a leaflet with information about the drugs and usually warnings about side effects and what kind of circumstances when it is not advisable to use the drug. Often, these leaflets may err on the cautious side where manufacturers' put in lots of warnings to protect themselves from being sued. There also have been cases where drug manufacturer have had to pay damages for withholding information from consumers about dangerous ill effects. Merck & Co., manufacturer of Vioxx (Rofecoxib), for example, had been accused of withholding information about increased risk of heart attack and stroke associated with long-term, high-dosage use.

Physicians' Desktop Reference

This is a reference often used by physicians and they have 2 websites, PDR online (free for US medical professionals only) and PDR Health (free consumer drug and medical information site). There are some controversy over Physicians' Desktop Reference as it is financed by drug manufacturers and with some saying it lack of reporting of updated and accurate drug dosages along with adverse drug effects. Oftentimes dosage information can be taken from phase 1 trial information where clinical drug information is incomplete, resulting in higher PDR-recommended dosages than therapeutically effective dosages for many medications.

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Wikipedia

I like to search for information on drugs from Wikipedia. For example, if I want information on the prescription Prozac, I will type the phrase "prozac wikipedia" into the Google search box above, tick the radio button beside WEB and click "Search".