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Drug Interactions between Ancef and Keflex

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

No interactions were found between Ancef and Keflex. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Ancef

A total of 39 drugs are known to interact with Ancef.

Keflex

A total of 37 drugs are known to interact with Keflex.

Drug and food interactions

Moderate

cephalexin food

Applies to: Keflex (cephalexin)

ADJUST DOSING INTERVAL: Oral products containing zinc such as mineral supplements and multivitamins may interfere with the gastrointestinal absorption of cephalexin, ceftibuten or cephradine. In one pharmacokinetic study (n=12), concurrent administration of zinc sulfate (250 mg, single oral dose) and cephalexin (500 mg, single oral dose) decreased cephalexin maximum concentration (Cmax) and systemic exposure (AUC; 0-inf) by 31.05% and 27.4%, respectively. However, in the same study, when zinc sulfate was administered 3 hours after the cephalexin dose, no significant alteration in cephalexin pharmacokinetics were observed.

MANAGEMENT: Oral medications or mineral supplements that contain zinc are recommended to be administered at least 3 hours after the cephalexin, ceftibuten or cephradine dose.

References

  1. Ding Y, Jia Y, Li F, et al. "The Effect of Staggered Administration of Zinc Sulfate on the Pharmacokinetics of Oral Cephalexin*" Br J Clin Pharmacol 73 (2011): 422-7
  2. World Health Organization "WHO Public Assessment Reports (WHOPARs) https://extranet.who.int/pqweb/medicines/prequalification-reports/whopars" (2020):
  3. Okamura M, Terada t, KatsuraT, Saito H, Inui K "Inhibitory effect of zinc on PEPT1-mediated transport of glycylsarcosine and beta-lactam antibiotics in human intestinal cell line Caco-2" Pharm Res 20 (2003): 1389-93

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Therapeutic duplication warnings

Therapeutic duplication is the use of more than one medicine from the same drug category or therapeutic class to treat the same condition. This can be intentional in cases where drugs with similar actions are used together for demonstrated therapeutic benefit. It can also be unintentional in cases where a patient has been treated by more than one doctor, or had prescriptions filled at more than one pharmacy, and can have potentially adverse consequences.

Duplication

Beta-lactam antibiotics

Therapeutic duplication

The recommended maximum number of medicines in the 'beta-lactam antibiotics' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'beta-lactam antibiotics' category:

  • Ancef (cefazolin)
  • Keflex (cephalexin)

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.

See also

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Medical Disclaimer