Drug interactions
gliclazide + levofloxacin
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.
Overview
Fluoroquinolones can cause dysglycemia; use with a sulfonylurea increases risk of significant hypoglycemia (rarely coma) or hyperglycemia.
Mechanism of action
Pharmacodynamic: fluoroquinolones may alter glucose homeostasis and can enhance sulfonylurea-induced insulin release (e.g., KATP channel effects).
Clinical management
Monitor blood glucose closely during therapy and for several days after; adjust/hold gliclazide if needed. Educate on hypo-/hyperglycemia signs. If severe dysglycemia occurs, discontinue levofloxacin and select an alternative antibiotic.
Drug reference
References
- Levofloxacin (Levaquin) Prescribing Information — Warnings and Precautions: Blood Glucose Disturbances — FDA Label
- Levofloxacin: Drug information — Interaction with antidiabetic agents (sulfonylureas) — Lexicomp
- FDA Drug Safety Communication: Fluoroquinolones — updated warnings about risk of hypoglycemic coma — FDA
Frequently asked questions
Can I take gliclazide with levofloxacin?
The interaction is rated: Moderate. Fluoroquinolones can cause dysglycemia; use with a sulfonylurea increases risk of significant hypoglycemia (rarely coma) or hyperglycemia.
How serious is the interaction between gliclazide and levofloxacin?
The interaction is rated: Moderate. Evidence level: High.
How is the interaction between gliclazide and levofloxacin managed?
Monitor blood glucose closely during therapy and for several days after; adjust/hold gliclazide if needed. Educate on hypo-/hyperglycemia signs. If severe dysglycemia occurs, discontinue levofloxacin and select an alternative antibiotic.
Why do gliclazide and levofloxacin interact?
Pharmacodynamic: fluoroquinolones may alter glucose homeostasis and can enhance sulfonylurea-induced insulin release (e.g., KATP channel effects).
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