Bacterial vaginosis, discharge, metronidazole

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I am 20 weeks and 3 days pregnant with my third clinical pregnancy. A little background: I also had a missed abortion and a loss at 18w6d due to apparent incompetent cervix. I had a complete uterine septum partially repaired. I now have a cerclage, placed at 11 weeks along. Am on pelvic rest and introduce nothing into the vagina. I am having a lot of uterine irritability and worry about the onset of PTL.

I have always had BV . . . it seems to recur within 4-8 weeks after treatment with metronidazole. I have taken 2 10-day courses of metronidazole (250 mg. po tid) during this pregnancy, with the last course finished a little over 24 hours ago. (Clindamycin did nothing to help me, earlier, in the first trimester)

Now my pale yellow discharge is back. It had dried up during the time I took metronidazole. No objectionable odor noted, though.

I am seeing my OB next week and will ask for a swab to check for clue cells. In the meantime I have some questions.

--Does metronidazole dry up secretions?

--Why would my discharge "turn on" within 24 hours of stopping metronidazole?

--How often is it safe to treat for BV anaerobes in pregnancy? Aside from eating plenty of lactobacillus and active yogurt, is there anything else I can do?

Thank you for your time.

--
L.

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