Yes. 12 FDA-approved labels for Gentamicin Sulfate carry a boxed warning, and its subject is patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated.... A boxed warning is the most serious warning the FDA requires on a prescription label. It is applied to the drug and to the situations in which it is used, not to any particular person taking it.
What the warning says
Below is how the Gentamicin Sulfate warning opens on one specific label, identified underneath it. Of the 12 Gentamicin Sulfate labels sampled, 6 carried materially different wordings and this was the most common, used by 5 of them.
WARNINGS Patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated with their use. As with other aminoglycosides, Gentamicin Sulfate Injection, USP is potentially nephrotoxic. The risk of nephrotoxicity is greater in patients with impaired renal function and in those who receive high dosage or prolonged therapy. Neurotoxicity manifested by ototoxicity, both vestibular and auditory, can occur in patients treated with Gentamicin Sulfate Injection, USP, primarily in those with pre-existing renal damage and in patients with normal renal function treated with higher doses and/or for longer periods than recommended.
GENTAMICIN SULFATE, Medical Purchasing Solutions, LLC, label version effective 15 May 2025. Opening of the warning; read the full label on DailyMed.Why the wording differs between manufacturers
There is no single official text of a boxed warning. The FDA sets what a warning must cover, and each manufacturer writes its own label within that. Of the 12 Gentamicin Sulfate labels sampled for this page, 6 carried materially different wordings of the same warning, and the version quoted above was used by 5 of them.
The hazard does not change between those 6 versions. Only the sentences do, which is why a refill from a different manufacturer can carry warning text that reads differently without anything about Gentamicin Sulfate or its risks having changed.
Gentamicin Sulfate is dispensed under 12 current FDA labels despite this warning, which is the point worth holding onto: a boxed warning is a disclosure requirement, not a verdict. What a boxed warning does and does not mean sets out the distinction.
Common questions
Does Gentamicin Sulfate have a black box warning?
Yes. 12 FDA-approved labels for Gentamicin Sulfate carry a boxed warning, and its subject is patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated.... A boxed warning is the strongest warning the FDA requires on a prescription label, and it is applied to the drug, not to any individual taking it.
What does the Gentamicin Sulfate boxed warning say?
The wording is set by each manufacturer within FDA requirements, so it varies. In the version quoted on this page, taken from a label effective 15 May 2025, the warning concerns patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated.... The full text is linked so the exact version can be read rather than summarised.
Does the Gentamicin Sulfate boxed warning mean the drug is unsafe or being withdrawn?
No. It means the FDA requires the risk of patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated... to be communicated prominently so prescribers weigh it explicitly. Gentamicin Sulfate remains FDA-approved and is dispensed under 12 current labels. A boxed warning is a disclosure requirement, not a judgement that a drug should not be used.
Why do different pharmacies show different warning text for the same drug?
Because each manufacturer writes its own label within the FDA's requirements. Of 12 Gentamicin Sulfate labels sampled here, 6 carried materially different wordings of the same warning. The hazard described is the same; the sentences are not. This is a common source of confusion when a prescription is refilled with a different manufacturer's product.
Should I stop taking Gentamicin Sulfate because of this warning?
This page does not answer that and cannot. The warning about patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated... is written for a prescriber deciding whether Gentamicin Sulfate suits a particular patient, and stopping a prescribed medicine carries its own risks that this page knows nothing about. Raise it with the prescriber or a pharmacist, who can see the whole picture.
Where this page's information comes from
The quotation above is from one Gentamicin Sulfate label, linked below by its DailyMed set identifier so the exact version can be opened rather than taken on trust. The figure of 12 labels, and the count of 6 distinct wordings among 12 sampled, were computed from the openFDA labelling API on 30 August 2026.
- GENTAMICIN SULFATE prescribing information, Medical Purchasing Solutions, LLC, effective 15 May 2025.
- openFDA drug labelling API, the source of the label counts and variant counts on this page.
Labels are revised over time. The version linked above is the one this page was written against, and a newer revision may differ. Counts reflect the labels present in openFDA on the retrieval date.