The trimethoprim solution in United States is stored at room temperature and will last until the expiry date of the medicine, as issued by the manufacturer. If it was dispensed into another bottle then it'll be hard to know but if you have the original bottle it should have an expiry date on it.
- Trimethoprim Information for Consumers
- Trimethoprim Information for Healthcare Professionals (includes dosage details)
- Side Effects of Trimethoprim (detailed)
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