Trimethoprim is most commonly used to treat urinary tract infections (eg. cystitis). It may also be used to treat bronchitis.
For urinary tract infections, the usual adult dose is 200 mg twice a day. For children 6-12 years old, 100mg twice per day. Children under 6 yrs take between 25 mg and 50 mg once a day.
For chronic infections and prophylaxis (prevention), 100mg at night is the usual adult dose.
- kidney impairment
- blood disorders
- folate deficiency
- liver impairment
- GI upset (nausea, vomiting)
- skin rash
Most people do not experience any side effects with this medicine.