Drug interactions
Tetracycline + Zinc sulfate
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
Zinc forms chelates with tetracycline in the GI tract, reducing tetracycline absorption and potentially decreasing antimicrobial efficacy; zinc absorption may also be reduced.
Mechanism of action
Pharmacokinetic: divalent cation chelation in the gastrointestinal tract forms nonabsorbable complexes, lowering tetracycline bioavailability (and possibly zinc).
Clinical management
Avoid coadministration; if needed, administer tetracycline at least 2 hours before or 4 hours after zinc. Monitor for reduced clinical response to tetracycline; consider alternative antibiotic or route if separation not feasible.
Drug reference
References
- Tetracycline: Drug information (Interactions section) — UpToDate
- Zinc Salts: Drug Interactions (Lexicomp monograph) — Lexicomp
- Tetracycline hydrochloride prescribing information – Drug Interactions/Drug–Food Interactions — FDA Label
Frequently asked questions
Can I take Tetracycline with Zinc sulfate?
The interaction is rated: Moderate. Zinc forms chelates with tetracycline in the GI tract, reducing tetracycline absorption and potentially decreasing antimicrobial efficacy; zinc absorption may also be reduced.
How serious is the interaction between Tetracycline and Zinc sulfate?
The interaction is rated: Moderate. Evidence level: High.
How is the interaction between Tetracycline and Zinc sulfate managed?
Avoid coadministration; if needed, administer tetracycline at least 2 hours before or 4 hours after zinc. Monitor for reduced clinical response to tetracycline; consider alternative antibiotic or route if separation not feasible.
Why do Tetracycline and Zinc sulfate interact?
Pharmacokinetic: divalent cation chelation in the gastrointestinal tract forms nonabsorbable complexes, lowering tetracycline bioavailability (and possibly zinc).
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.