Drug interactions
Insulin nph + Levofloxacin
Severity: Moderate
Insulin nph and Levofloxacin: moderate 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
Fluoroquinolones, including levofloxacin, can cause both hypoglycemia and hyperglycemia in patients on insulin. Severe and occasionally fatal hypoglycemia has been reported, mainly in older patients and those with renal impairment.
What this interaction means in plain words
Insulin nph and Levofloxacin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Fluoroquinolones alter pancreatic beta-cell insulin release, producing additive glucose-lowering effects and dysglycemia.
What to do
Monitor blood glucose closely when starting or stopping levofloxacin and adjust insulin as needed. Teach the patient to recognize hypoglycemia symptoms, and if a reaction occurs stop levofloxacin and switch to a non-fluoroquinolone.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Levofloxacin
- Dronedarone + Levofloxacin Contraindicated
- Ibutilide + Levofloxacin Contraindicated
- Levofloxacin + Thioridazine Contraindicated
- Levofloxacin + Vandetanib Contraindicated
- Levofloxacin + Ziprasidone Contraindicated
- Adagrasib + Levofloxacin Major
Frequently asked questions
Can I take Insulin nph with Levofloxacin?
MediHelp rates the interaction as moderate. Insulin nph and Levofloxacin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Fluoroquinolones, including levofloxacin, can cause both hypoglycemia and hyperglycemia in patients on insulin. Severe and occasionally fatal hypoglycemia has been reported, mainly in older patients and those with renal impairment.
How serious is the interaction between Insulin nph and Levofloxacin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose closely when starting or stopping levofloxacin and adjust insulin as needed. Teach the patient to recognize hypoglycemia symptoms, and if a reaction occurs stop levofloxacin and switch to a non-fluoroquinolone.
What other medicines interact with Levofloxacin?
MediHelp also lists interactions of Levofloxacin with, for example, Dronedarone, Ibutilide, Thioridazine. The full list is on the Levofloxacin page.
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