Drug interactions
Bismuth subsalicylate + Tobramycin inhaled
Severity: Minor
Bismuth subsalicylate and Tobramycin inhaled: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Systemic absorption of inhaled tobramycin is low, and bismuth subsalicylate has little nephrotoxic potential in short use, though salicylate can add renal and ototoxic stress. Clinical relevance is limited, but caution is reasonable in renal impairment or prolonged salicylate use.
What this interaction means in plain words
Bismuth subsalicylate and Tobramycin inhaled have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Theoretical additive nephrotoxicity and ototoxicity from salicylate and aminoglycoside exposure.
What to do
Avoid prolonged or high-dose bismuth subsalicylate in patients on inhaled tobramycin, especially with renal impairment. Monitor renal function and hearing symptoms.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Bismuth subsalicylate
- Bismuth subsalicylate + Dichlorphenamide Major
- Bismuth subsalicylate + Warfarin Major
- Acetylsalicylic acid + Bismuth subsalicylate Moderate
- Amlodipine-benazepril + Bismuth subsalicylate Moderate
- Aspirin / citric acid / sodium bicarbonate + Bismuth subsalicylate Moderate
- Aspirin rectal + Bismuth subsalicylate Moderate
Frequently asked questions
Can I take Bismuth subsalicylate with Tobramycin inhaled?
MediHelp rates the interaction as minor. Bismuth subsalicylate and Tobramycin inhaled have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Systemic absorption of inhaled tobramycin is low, and bismuth subsalicylate has little nephrotoxic potential in short use, though salicylate can add renal and ototoxic stress. Clinical relevance is limited, but caution is reasonable in renal impairment or prolonged salicylate use.
How serious is the interaction between Bismuth subsalicylate and Tobramycin inhaled?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid prolonged or high-dose bismuth subsalicylate in patients on inhaled tobramycin, especially with renal impairment. Monitor renal function and hearing symptoms.
What other medicines interact with Bismuth subsalicylate?
MediHelp also lists interactions of Bismuth subsalicylate with, for example, Dichlorphenamide, Warfarin, Acetylsalicylic acid. The full list is on the Bismuth subsalicylate page.
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