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does smoking meth prevent antibiotics from working. hi. i recently have been diagnosed with an std called "trich". i was prescribed tindamax in 4 pills i took at one time. went back to doctor for follow up and i havent had sex no reused any needles to inject drugs with either and i still have trich. so my gynecologist prescribed me a generic antibotic called metronidazole 500 mg. its a 7 day long treatment 2 pills a day with food. . my question is why didnt the tindamax work?