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In literature it is not clear whether the drug metronidazole is acidic or basic. However the British pharmacopoeia indicates that an aqueous saturated solution of metronidazole has a pH of 5.8. This tells me that I should consider it as a weak acid but the according to the structure the drug has no acidic groups.

So my question is whether metronidazole basic or acidic?

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    $\begingroup$ They should be much more clear about it, but I'm pretty sure it's used as a salt - that's why pH would be lower than 7. $\endgroup$
    – Mithoron
    Commented Jun 2 at 16:28

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