From: "MARK NAYLOR" <mnaylor@CCLINK.NET.uokhsc.edu>
 
On the subject of BCPs and antibiotics, If I know that a patient is taking the 
pill, I generally warn her that if she notices breakthrough bleeding that it 
could be the tetracycline decreasing the efficacy of the pill, and that she 
should notify me. I can't recall ever getting a call about breakthrough 
bleeding, but some patients have heard of this from other sources and have 
asked 
me about it. I think the problem is not a minor one, if it exists at all, 
although I would be interested to hear if other members of the list have seen 
evidence of this in their practices.