Most common medications prescribed by family doctors contain animal products, but it's hard to tell if they're suitable for vegetarians and other patients with dietary preferences, a new study finds.

Many patients and doctors are unaware that commonly prescribed drugs contain animal products, which isn't clear by reading the list of ingredients, researchers say in this week's issue of the British Medical Journal.

Dr. Kinesh Patel, a research fellow at St. Mark's Hospital in Harrow and Dr. Kate Tatham of Imperial College in London, said the potential "problem ingredients" include:

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