When a woman discovers she is pregnant while taking a drug with uncertain fetal safety, the first conversation shapes everything that follows. Establish gestational age from the last menstrual period and an early scan, because the exposure window relative to organogenesis (roughly weeks 3 to 8 after conception) determines the risk. Record the exact drug, dose and dates. Then decide what to switch to rather than simply stopping, since uncontrolled maternal disease often carries more fetal risk than the drug did.
- Date the pregnancy accurately with an early ultrasound before counselling on risk.
- Document the drug, dose, start date and last dose taken.
- Switch to an agent with established pregnancy data rather than stopping treatment abruptly.
- Report the exposure to a pregnancy registry where one exists.
Why it matters
Abrupt stopping can leave diabetes, hypertension or epilepsy uncontrolled at the point the fetus is most vulnerable.
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