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This is not normal. Though burning urination is a very rare adverse effect of flagyl, still your present symptoms should not be ascribed to flagyl and if the symptoms continue despite drinking adequate fluids they need to be investigated to find out a causative factor which can be an infection. Also it has been more than 24 hours since taking the medication and side effects after 24 hours of taking flagyl are minimal. Only when other causes have been investigated and ruled out we can then say that you are probably having an adverse effect of flagyl. Therefore if this symptom continues or if additional symptoms develop such as fever, please consult your doctor and have urine examination done to look for any abnormalities.
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