What Happens If You Miss a Dose of Prometrium

Missing a single dose of Prometrium (micronized progesterone capsule) may allow a temporary return of menopausal symptoms or may cause breakthrough bleeding. According to FDA-approved prescribing information for Prometrium, if you remember the same day, take the missed dose as soon as possible; if you do not remember until the next day, take your usual dose for that day and do not double up. Contact your prescriber if doses are missed repeatedly or if symptoms change.

Prometrium works by maintaining progesterone levels. A one-off missed capsule may have limited impact because progesterone's effects persist for many hours; however, missing multiple doses or several days in a row may lower progesterone enough to cause breakthrough bleeding, withdrawal symptoms, or reduced protection of the uterine lining. If you are on Prometrium as part of combined hormone therapy to prevent endometrial hyperplasia, consistency is important for endometrial protection. If you are using it for fertility or luteal-phase support, even a single missed dose may be significant—contact your reproductive specialist promptly.

What to do if you miss a dose

• If you remember the same day: According to FDA-approved prescribing information for Prometrium, take the missed dose as soon as possible and then continue your regular schedule.
• If you remember the next day: Per FDA-approved prescribing information for Prometrium, take your planned dose for that day and do not take two doses to "catch up."
• If you miss more than one dose or several days: Contact your prescriber for specific instructions — you may need monitoring or a plan to restart safely.
• Do not double doses unless directed by your prescriber.
• If you are pregnant or trying to conceive: Call your clinician promptly for tailored guidance.

If you are uncertain what regimen you were given (continuous daily vs. cyclical/limited days each month), check your prescription instructions and call your clinician or pharmacist — they will advise whether a missed dose may cause breakthrough bleeding or may affect your therapy. Contact your prescriber if doses are missed repeatedly or if symptoms change. Occasional missed Prometrium doses may not pose serious risk, but repeated misses should be discussed with your prescriber, particularly if you have concerns about bleeding, pregnancy, or fertility treatment.