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Women's health

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Antibiotics and periods

2 replies

Questionsok · 05/02/2026 09:15

Has anyone experienced abx interfering with periods? Nothing on the NHS or “official” data that seems to confirm this (that I can see, anyway, maybe I’m looking in the wrong place)

the reason I ask is because I started my period on a Sunday morning (6 days is my usual length).

I then had to start a 7 day course of erythromycin on Monday night.

I should have finished my period latest Friday. Which kind of happened, but from Friday - Wednesday I’ve had brown spotting. This isn’t like me and wondering if it was abx related? Because I was taking them until Monday night.

I guess time will tell and I’ll keep monitoring it, but wondering if anyone has had a similar experience with antibiotics?

OP posts:
Greybeardy · 05/02/2026 11:11

being ill can affect your periods.

lostatsea999 · 05/02/2026 22:15

Been on penicillin over last week. Fought to stay on the diabetic drug metformin

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