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Drug Interactions between cimetidine and Lidotran

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

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Interactions between your drugs

Moderate

cimetidine lidocaine topical

Applies to: cimetidine and Lidotran (lidocaine topical)

MONITOR: Coadministration with cimetidine may increase the plasma concentration of topical lidocaine formulations. In a study of healthy volunteers, cimetidine increased the systemic exposure (AUC) of a 10% topical lidocaine spray applied to the pharynx by 1.5-fold. The proposed mechanism for this interaction is cimetidine-mediated inhibition of CYP450 1A2 and 3A4 which are involved in the metabolism of lidocaine. The degree of systemic absorption of topical lidocaine may be dependent on the duration of application and the applied surface area.

MANAGEMENT: The potential for an interaction should be considered during concomitant use of cimetidine and topical lidocaine formulations. If coadministration is required, patients should be monitored for lidocaine-related adverse effects or toxicities including drowsiness, mental status change, or tremor.

References (4)
  1. (2023) "Product Information. LMX 4 (lidocaine topical)." Ferndale Pharmaceuticals Ltd
  2. (2021) "Product Information. Versatis (lidocaine topical)." Seqirus Pty Ltd
  3. (2024) "Product Information. Xylocaine Topical (lidocaine topical)." Aspen Pharmacare Australia Pty Ltd
  4. Parish RC, Gotz VP, Lopez LM, Mehta JL, Curry SH (1987) "Serum lidocaine concentrations following application to the oropharynx: effects of cimetidine" Ther Drug Monit, 9, p. 292-7

Drug and food interactions

Minor

cimetidine food

Applies to: cimetidine

Concurrent use of cimetidine and ethanol may result in increased ethanol concentrations. The mechanism appears to be due to inhibition of gastric alcohol dehydrogenase by cimetidine, leading to increased bioavailability of the alcohol and inhibition of hepatic metabolism of alcohol. The clinical significance of this interaction is limited. More importantly, patients requiring cimetidine for gastrointestinal disease should be counseled to avoid alcohol to prevent worsening of their disease. The other H-2 receptor antagonists appear to have minimal effects on the concentrations of alcohol.

References (2)
  1. Feely J, Wood AJ (1982) "Effects of cimetidine on the elimination and actions of ethanol." JAMA, 247, p. 2819-21
  2. Hansten PD (1992) "Effects of H2-receptor antagonists on blood alcohol levels." JAMA, 267, p. 2469
Minor

cimetidine food

Applies to: cimetidine

Caffeine effects may be increased in patients also taking cimetidine. The mechanism may be due to decreased caffeine metabolism induced by cimetidine. Although adequate clinical data are lacking, a reduction in dose or elimination of caffeine may be needed if excess CNS stimulation is observed.

References (2)
  1. (2001) "Product Information. Tagamet (cimetidine)." SmithKline Beecham
  2. Broughton LJ, Rodgers HJ (1981) "Decreased systenuc clearance of caffeine due to cimetidine." Br J Clin Pharmacol, 12, p. 155-9
Minor

cimetidine food

Applies to: cimetidine

H2 antagonists may reduce the clearance of nicotine. Cimetidine, 600 mg given twice a day for two days, reduced clearance of an intravenous nicotine dose by 30%. Ranitidine, 300 mg given twice a day for two days, reduced clearance by 10%. The clinical significance of this interaction is not known. Patients should be monitored for increased nicotine effects when using the patches or gum for smoking cessation and dosage adjustments should be made as appropriate.

References (1)
  1. Bendayan R, Sullivan JT, Shaw C, Frecker RC, Sellers EM (1990) "Effect of cimetidine and ranitidine on the hepatic and renal elimination of nicotine in humans." Eur J Clin Pharmacol, 38, p. 165-9

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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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

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