Why do I feel weird after metronidazole?

Why Do I Feel Weird After Taking Metronidazole?

If you've taken metronidazole and are now feeling a little off, you're not alone. Many people report feeling "weird" after starting the medication, and more often than not, it's tied to common side effects. Feeling nauseous or even vomiting is one of the most frequent complaints. It’s not uncommon to also experience diarrhoea or an upset stomach, especially if you take the tablets on an empty stomach.

Another peculiar sensation people describe is a persistent metallic taste in the mouth — imagine licking a battery or having a mouthful of coins. While it’s not harmful, this taste can make food seem unappetizing and add to that general sense of feeling “off.” Most of these side effects are mild and tend to fade as your body adjusts to the medication.

It's worth noting that how you take metronidazole can influence how you feel. Taking it with food, for example, often helps reduce stomach discomfort. Also, if you're using the cream or vaginal gel, side effects are much less likely — those formulations are typically better tolerated because they’re absorbed locally rather than circulating through your whole system.

Still, if the nausea becomes severe, or if you develop headaches, dizziness, or skin reactions, it's best to check in with your doctor. While rare, some people may be sensitive to the drug or experience a more serious reaction.

Bottom line? Feeling a bit strange after metronidazole isn't unusual. Most side effects are temporary and manageable. But if something feels truly wrong — not just a bit weird — don’t tough it out. Your doctor is there to help you navigate it safely.