Does Lamivudine Oral Interact with Trimethoprim?
Lamivudine Oral and Trimethoprim have a moderate drug interaction according to U.S. FDA drug labeling data. Potential interaction possible due to similar renal elimination pathways via organic cationic transport system. Monitor for interactions. The mechanism involves both drugs eliminated via active organic cationic secretion in the kidney. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Lamivudine Oral Class
- Hepatitis B Virus Nucleoside Analog Reverse Transcriptase Inhibitor
- Trimethoprim Class
- Dihydrofolate Reductase Inhibitor Antibacterial
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Lamivudine Oral and Trimethoprim occurs because both drugs eliminated via active organic cationic secretion in the kidney. Clinically, this means potential interaction possible due to similar renal elimination pathways via organic cationic transport system. monitor for interactions. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Lamivudine Oral and your doctor is considering prescribing Trimethoprim (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider