It is really important when you are prescribed a drug that you do your own research on that drug. The prescribing doctor may not know what other medications you are taking or what other health problems you might have. Some drugs can interact negatively with others and in some cases can even have life threatening consequences. Good websites for researching drugs are
This is also the case with supplements and vitamins. For example, Vitamin D is often recommended in higher doses for people with IBD, however, people with IBD can be prone to getting kidney stones and Vitamin D can also cause kidney stones. This is also the case with calcium supplements.
Good websites for researching supplements are