Does Tobramycin Interact with Penicillin G?
CDI records a unknown classification for Tobramycin and Penicillin G. The stored summary is: Combined with tobramycin results in synergistic bactericidal effect in vitro against certain strains of Enterococcus faecalis, but not synergistic against Enterococcus faecium. The mechanism involves aminoglycoside combined with antibiotic that interferes with cell-wall synthesis. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.
Evidence status
A current label comparison is not yet available for this record. The summary and severity are stored CDI information; they have not been independently validated on this page against the exact product label.
Confirm the medicine, formulation, route, and applicable warning with your pharmacist or prescriber. Independent clinical review has not been recorded.
Saved label reference on DailyMed. This identifier has not been checked here as support for the current claim.
- Stored CDI classification
- Unknown
- Tobramycin Class
- Aminoglycoside Antibacterial
- Management
- Confirm exact products with your pharmacist
- Data Source
- U.S. FDA via OpenFDA
Recorded Mechanism
Aminoglycoside combined with antibiotic that interferes with cell-wall synthesis
What To Tell Your Doctor or Pharmacist
If you are taking Tobramycin and your doctor is considering prescribing Penicillin G (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
- Never stop or change either medication without first consulting your healthcare provider