Im sorry to hear about your symptoms. Well BV can be a difficult infection to treat in some cases. Infact it has been estimated that upto 30% of patients can relapse within the first three months of completion of therapy. Now your doctor has certainly prescribed you the right therapy for this problem. Metronidazole followed by clindamycin in the right therapy. And it can take upto a week after the completion of therapy for the fish like odor to disappear. It can even take upto 10 days for the odor to completely resolve. Now if the symptoms dont improve then tinidazole can be used which is a newer form of therapy and would be effective if the other two fail.
Now what you need to be looking for in case of a relapse are worsening of the discharge and the smell and if they get worse or dont seem to resolve by the end of the week then you would need to be treated again. Sometimes topical boric acid has been used with some efficacy in case of resistant infections. In some cases combination therapy can be instituted to improve the outcomes as well.
Now to simply answer your questions,
1) yes it is common for patients to have difficult to treat BV
2) Look for worsening of your symptoms to indicate that the treatment hasnt worked or you have relapsed after the week is up.
Do you have any more questions?
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