Category C

Either animal studies suggest an increased risk of birth defects, and there are no large well-done human studies, or there are no good animal or human studies, but the drug's benefits may be worth the potential risk

Examples: Prozac, Zoloft (antidepressants); Tamiflu (antiviral)

Fact: Experts say most drugs are in this category

Read "The Year in Medicine 2008: From A to Z."

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