Which statement indicates understanding about methimazole safety concerns?

• A. I should report sore throat or fever to my provider if either occurs.
• B. I should expect liver toxicity and monitor liver enzymes weekly.
• C. I should stop methimazole if I gain 5 pounds.
• D. I can take methimazole during the first trimester without issues.

Answer: (A)

The key safety concept is recognizing agranulocytosis risk with methimazole. This rare but serious drop in white blood cells can make even minor infections dangerous. The most appropriate safety action is to report sore throat or fever to a provider promptly because these symptoms could signal neutropenia and require urgent evaluation, possibly stopping the medication and checking a blood count.

Liver toxicity is a concern with methimazole, but routine weekly liver enzyme monitoring isn’t standard practice; patients are advised to watch for liver-related symptoms (like jaundice, dark urine, fatigue) and have tests if symptoms occur. Stopping the drug for a small weight gain isn’t warranted, as weight change doesn’t reflect a dangerous adverse effect. Methimazole is avoided in the first trimester due to teratogenic risk, with alternatives like propylthiouracil used instead early in pregnancy.