Bactrim, containing sulfamethoxazole and trimethoprim, can cause side effects. Common ones include nausea, vomiting, diarrhea, and rash. Less frequent, but still possible, are headache, dizziness, and stomach pain.
Serious side effects are rare but require immediate medical attention. These include severe allergic reactions (like swelling of the face, lips, or tongue), difficulty breathing, and unusual bleeding or bruising. Report any significant or concerning side effects to your doctor immediately.
Interactions with other medications are possible. Bactrim can affect how some medications work, and vice versa. Specifically, it can interact with certain blood thinners (like warfarin), methotrexate (a chemotherapy drug), and some diuretics. Always inform your doctor and pharmacist of all medications, supplements, and herbal remedies you’re taking before starting Bactrim.
| Warfarin (blood thinner) | Increased bleeding risk | Close monitoring of INR levels |
| Methotrexate | Increased methotrexate toxicity | Dose adjustment may be necessary |
| Loop diuretics | Increased risk of hypokalemia | Monitor potassium levels |
This information is not exhaustive; consult your doctor or pharmacist for a complete list of potential interactions and side effects specific to your situation. They can assess your individual risks and provide tailored advice.
