I had the pfizer vaccine and had two bouts of diarrhea after taking my birth control pill (less than 2 hours later). Is it still effective?

Hello,

Actually, diarrhea may be one of the possible side effects with the Pfizer vaccine. However, it is very likely that your birth control pill is still effective despite the diarrhea. Indeed, after 2 hours it was already mostly absorbed by the body.

I hope this answers your question.