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  5. I've been on amoxicillin for a bacterial infection and I'm about four days into taking 2 tablets of 625mg each per day. I've started noticing that my stool looks black and tar-like. Is this a normal side effect from the meds or should I be worried about something more serious?

I've been on amoxicillin for a bacterial infection and I'm about four days into taking 2 tablets of 625mg each per day. I've started noticing that my stool looks black and tar-like. Is this a normal side effect from the meds or should I be worried about something more serious?

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I've been on amoxicillin for a bacterial infection and I'm about four days into taking 2 tablets of 625mg each per day. I've started noticing that my stool looks black and tar-like. Is this a normal side effect from the meds or should I be worried about something more serious?

Passing black, tar-like stool can be a concerning side effect known as melena, which may indicate gastrointestinal bleeding. It is important to consult your healthcare provider immediately. In the meantime, you can consider taking a probiotic supplement to help maintain the balance of good bacteria in your gut.

Last updated on 04 Jul 2025

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