Does Tobramycin Inhalation Solution Interact with Mannitol?
Tobramycin Inhalation Solution and Mannitol have a contraindicated drug interaction according to U.S. FDA drug labeling data. Intravenous mannitol should not be administered concomitantly; diuretics can enhance aminoglycoside toxicity by altering antibiotic concentrations in serum and tissue. The mechanism involves enhanced aminoglycoside toxicity through altered serum and tissue antibiotic concentrations. 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
- Contraindicated
- Tobramycin Inhalation Solution Class
- Aminoglycoside Antibacterial
- Mannitol Class
- Osmotic Diuretic
- Management
- Do not take together
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Tobramycin Inhalation Solution and Mannitol occurs because enhanced aminoglycoside toxicity through altered serum and tissue antibiotic concentrations. Clinically, this means intravenous mannitol should not be administered concomitantly; diuretics can enhance aminoglycoside toxicity by altering antibiotic concentrations in serum and tissue. Because of the severity of this interaction, these medications are contraindicated — meaning they should not be taken together under any circumstances. If you are currently taking both, contact your healthcare provider immediately to discuss alternatives.
What To Tell Your Doctor or Pharmacist
If you are taking Tobramycin Inhalation Solution and your doctor is considering prescribing Mannitol (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 about alternative medications that do not interact with your current regimen
- Ask how frequently you should be monitored while these are co-prescribed
- Never stop or change either medication without first consulting your healthcare provider