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Preconception folate — USMLE Step 3 MCQ

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HardOB/GYN (Prenatal / Contraception / Screening)Preconception folateUSMLE Step 3

A 30-year-old with generalized epilepsy controlled on valproate wants to conceive in 9 months. She has been seizure-free for 2 years, previously relapsed when medication was stopped, and has not tried another effective antiseizure medication. What is the best preconception plan?

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Correct answer: B — Cross-taper valproate preconception to a lower-risk effective regimen and prescribe folic acid

The best answer is “Cross-taper valproate preconception to a lower-risk effective regimen and prescribe folic acid”. Medication should be optimized before conception while seizure control is preserved. The AAN/AES/SMFM guideline recommends avoiding valproate when clinically feasible, considering lower-risk agents such as lamotrigine, levetiracetam, or oxcarbazepine when appropriate, and prescribing at least 0.4 mg folic acid. Neither delayed nor abrupt change safely balances teratogenic and seizure risks, and folate does not neutralize valproate exposure.

Reference: AAN/AES/SMFM Guideline: Antiseizure Medication Exposure During Pregnancy: https://www.aan.com/Guidelines/Home/GuidelineDetail/1103