NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Which of the following is a side effect of warfarin?

  1. Nausea

  2. Bleeding/bruising

  3. Insomnia

  4. Weight gain

The correct answer is: Bleeding/bruising

Warfarin is a type of anticoagulant medication commonly prescribed for patients with heart conditions or those at risk for blood clots. It works by blocking the formation of blood clots, but this also prevents the body's normal clotting process. Therefore, the most common side effect of warfarin is bleeding or bruising, as the medication can cause blood to take longer to clot. This can lead to excessive bleeding from minor cuts or injuries, as well as bruising more easily. Nausea, insomnia, and weight gain are not common side effects of warfarin and should be discussed with a doctor if experienced.

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