Can having diarrhea decrease the effectiveness of my pill?

24-year-old woman5 years ago
Two hours after taking my birth control pill (Marvelon), I had a slight diarrhea. Is this dangerous for the effectiveness?
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12 hours

Sarah-Yan Chagnon · 5 years ago
Hello,
No, a simple diarrhea is not enough to decrease the effectiveness of your pill. It is more repeated diarrhea, for example during a gastroenteritis or when taking antibiotics, that theoretically the pill can decrease in effectiveness. Indeed, we consider that one day of diarrhea is equivalent to "losing" the pill that day.
Hope to see you soon,
Sarah-Yan Chagnon, pharmacist

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