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Drug Interactions between cimetidine and Riopan Plus Double Strength

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

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Interactions between your drugs

Minor

cimetidine magaldrate

Applies to: cimetidine and Riopan Plus Double Strength (magaldrate / simethicone)

Antacids and some aluminum, calcium, and magnesium salts may decrease the plasma concentrations of H2-receptor antagonists during oral coadministration. The mechanism of interaction is unknown, but may involve reduced oral absorption due to increased gastric pH. Study data vary, with no changes to nearly 60% reductions in systemic exposures (AUCs) reported for cimetidine, famotidine, and ranitidine. The clinical significance has not been established. As a precaution, patients may consider taking H2-receptor antagonists one to two hours before antacids.

References (12)
  1. Donn KH, Eshelman FN, Plachetka JR, et al. (1984) "The effects of antacid and propantheline on the absorption of oral ranitidine." Pharmacotherapy, 4, p. 89-92
  2. Albin H, Vincon G, Demotes-Mainard F, et al. (1984) "Effect of aluminium phosphate on the bioavailability of cimetidine and prednisolone." Eur J Clin Pharmacol, 26, p. 271-3
  3. Lin JH, Chremos AN, Kanovsky SM, Schwartz S, Yeh KC, Kann J (1987) "Effects of antacids and food on absorption of famotidine." Br J Clin Pharmacol, 24, p. 551-3
  4. Bodemar G, Norlander B, Walan A (1979) "Diminished absorption of cimetidine caused by antacids." Lancet, 02/24/79, p. 444-5
  5. Steinberg WM, Lewis JH, Katz DM (1982) "Antacids inhibit absorption of cimetidine." N Engl J Med, 307, p. 400-4
  6. Barzaghi N, Gatti G, Crema F, Perucca E (1989) "Impaired bioavailability of famotidine given concurrently with a potent antacid." J Clin Pharmacol, 29, p. 670-2
  7. Russell WL, Lopez LM, Normann SA, et al. (1984) "Effect of antacids on predicted steady-state cimetidine concentrations." Dig Dis Sci, 29, p. 385-9
  8. Shelly DW, Doering PL, Russell WL, Guild RT, Lopez LM, Perrin J (1986) "Effect of concomitant antacid administration on plasma cimetidine concentrations during repetitive dosing." Drug Intell Clin Pharm, 20, p. 792-5
  9. Albin H, Vincon G, Begaud B, Bistue C, Perez P (1987) "Effect of aluminum phosphate on the bioavailability of ranitidine." Eur J Clin Pharmacol, 32, p. 97-9
  10. Mihaly GW, Marino AT, Webster LK, Jones DB, Louis WJ, Smallwood RA (1982) "High dose of antacid (Mylanta II) reduces bioavailability of ranitidine." Br Med J, 285, p. 998-9
  11. Covington TR, eds., Lawson LC, Young LL (1993) "Handbook of Nonprescription Drugs." Washington, DC: American Pharmaceutical Association
  12. Bachmann KA, Sullivan TJ, Jauregui L, Reese J, Miller K, Levine L (1994) "Drug interactions of h-2-receptor antagonists." Scand J Gastroenterol, 29, p. 14-9

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.

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.

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