Mouth Ulcers While Taking Bactrim

I was recently prescribed Bactrim for a badder infection which I've taken before. For some reason every time I take this medication I get an ulcer inside my mouth. Is this a side effect or an allergic reaction?

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Hello, Sophia! How are you doing?

Have you consulted your doctor?

Antibiotics can cause yeast infections, as a side effect, so that may be what's causing the sores in your mouth. It would be best to have it checked out, as if it is a yeast infection, it will need treatment.

Other side effects, as listed by the FDA, may possibly include nausea, dizziness, headache, non-allergic skin rash and diarrhea.

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