How long does metronidazole stay in my system?

I took a single dose of metronidazole (it was 4 tabs at once, 500 mg) and one of the side effects are the metallic taste in your mouth. I took the dose yesterday and this bitter taste is so uncomfortable.. If I eat or drink anything it makes the food taste like chemicals and makes me gag so I haven’t been able to... show more I took a single dose of metronidazole (it was 4 tabs at once, 500 mg) and one of the side effects are the metallic taste in your mouth. I took the dose yesterday and this bitter taste is so uncomfortable.. If I eat or drink anything it makes the food taste like chemicals and makes me gag so I haven’t been able to eat. Any suggestions for how to get rid of the metallic taste or how long it will take for it to go away on its own?
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