Took 250 2 a day for 7 days of metronidazole for bv didn't work then 500 2 a day didn't finish course.should i take another course in a few weeks?

Get rechecked: to rule out another infectious cause,

You may need to : be tested again. Do you have symptoms? Have you tried taking probiotics? You risk getting have severe heartburn/stomach upset after all that Flagyl. Consult your GYN provider,

Cream: Sometimes a course of potent antibiotic vaginal cream is also needed to clear a bacterial vaginal infection. Discuss this with your gynecologist.

No: You should speak to a doctor about this before taking more antibiotics as prescribed. How do you still have so many antibiotics left? Are you still having symptoms? It is best to be re-evaluated by a doctor before trying another course of antibiotics. There are always potential side effects and you could build resistance if you take antibiotics you don't need. Best wishes.