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Do antibiotics affect the effectiveness of contraceptive pills when using placebo pills?
Hello. I was assigned Xifaxan for a week. I finished taking it on Friday. I also take Vibin birth control pills. The doctor I was with said that you don't have to take Xifaxan, but when I started taking Xifaxan, I protected myself for the period of taking it. So I started taking the antibiotic that Friday, and I still had 4 days to take the placebo pills, so I started taking the antibiotic at the end of the pack, which I heard is better than when you start it at the beginning of the contraceptive pill pack. On Tuesday, I was already taking placebo pills. When I took a placebo and an antibiotic, I did not protect myself at all from Friday, that is, from the last day of taking Xifaxan, but with 4 tablets of placebo. Is it true that an antibiotic with a placebo has no interaction? And doesn't Xifaxan really affect Vibin? There is nothing in one or the other leaflet about it. There were also similar questions and I saw the answer that just at Xifaxan does not disturb, which the doctor said but I would like to make sure
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Aleksandra Żywiec-Pelczar Pharmacist
2 years ago
Rzeczywiście, badania naukowe nie potwierdziły negatywnego wpływu ryfaksyminy zawartej w produkcie leczniczym Xifaxan na skuteczność tabletek antykoncepcyjnych. W opisanej sytuacji nie ma więc powodów do niepokoju.
Antybiotyki nie wchodzą w interakcje z tabletkami palcebo, gdyż nie posiadają one hormonów. Jednak w przypadku, gdy stosuje się 1 z antybiotyków o udokumentowanym wpływie na skuteczność antykoncepcji (m.in. ryfampicyna, ampicylina i tetracykliny) dodatkową metodę antykoncepcji należy stosować przez 7 dni po zakończeniu antybiotykoterapii, bez względu na to, na jakim etapie cyklu rozpoczęto stosowania antybiotyku.