Metronidazole - why does my infection keep coming back?

I had the same problem 12 months ago . The reason it comes back is because antibiotics wipes out your good and bad bacteria so when you stop medication bad bacteria takes over quicker than the good.
My success was making milk kefir. At the end of your course of medication dip a tampon in milk kefir insert into your vagina and leave overnight, do this for 3-5 consecutive nights. Abstain from all sugar for 7 -14 days after medication and drink one shot of the milk kefir daily on commencement of meds and 2 weeks following .. you will be good to go from then on. You can also give your partner a genital dip with the kefir. Good luck

Bacterial vaginosis BV is the most common vaginal infection in women ages 15-44. Doctors do not know what causes BV or how some women get it but it is linked to an imbalance of “good” and “harmful” bacteria normally found in the vagina. Doctors do know that having a new sex partner or multiple sex partners and douching can upset the balance of bacteria and put women at increased risk for getting BV.

If the standard treatments for BV haven’t worked, and you’ve had more than three infections in a year, ask your doctor about suppressive therapy. Some women have had success with metronidazole gel applied twice a week for three to six months along with probiotics to help restore natural vagina flora.

For more information see: https://www.drugs.com/cg/bacterial-vaginosis.html

Hi Rosemary
Metronidazole is used to treat both BV and trichomoniasis. If your symptoms keep coming back it could be your sexual partner. Ask your doctor for a prescription of boric acid that is inserted into the vagina once a week for 4 months and have your sexual partner treated. Make sure to take probiotics everyday and while on treatment of boric acid. I hope this helps.