Always consult your doctor or pharmacist before taking sulfamethoxazole. If your condition does not improve or becomes worse, then call your doctor.
Driving or operating machinery is okay only if you are sure about how you might react to it, because sulfamethoxazole may cause weakness, dizziness and headache.
Do NOT use sulfamethoxazole if:
- You are allergic to any ingredient in sulfamethoxazole;
- You have a history of low blood platelet levels caused by trimethoprim or sulfa medicine;
- You have liver damage or severe kidney problem;
- You have anemia caused by low levels of folate in the blood;
- The patient is a child younger than 2 months old;
- You are taking dofetilide or methenamine.
Use of sulfamethoxazole during pregnancy or breast feeding should be avoided unless the doctor recommends it. Breastfeeding should be avoided if the infant is premature, or ill, or if the infant has hyperbilirubinemia, or glucose-6-phosphate dehydrogenase (G6PD) deficiency. Consult your doctor or health care professional before taking sulfamethoxazole.
Refer to your doctor or pharmacist for guidelines on dosage. Do not exceed what they advise.
Usual dose for adults is: 160mg-800mg orally every 12 hours for 10 to 14 days.
Usual does for children is: for children 2 months of age and older and weighing up to 40kg: 40mg per kilogram of body weight given in two divided doses every 12 hours for 10 days.
There are 22 major drugs known that may interact with sulfamethoxazole. Consult with your doctor about any medications you are taking, before your treatment with sulfamethoxazole.