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Yes Metronidazole is given for bacterial vaginosis but valtrex is anti viral drug and will not be effective in case of BV .
The dose of metronidazole is 500 mg three times daily for 7 days.It is better if you also use clindamycin cream locally.
Along with treatment you should maintain vaginal ph like by 1.avoid repeated cleaning of vagina.2.avoid douche.3.wear cotton underwear.