Skip to main content

Drug Interactions between Dual Action Complete and toremifene

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

Edit list (add/remove drugs)

Interactions between your drugs

Moderate

famotidine toremifene

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide) and toremifene

MONITOR: Famotidine may cause QTc prolongation. Theoretically, coadministration with other agents that can prolong the QT interval may result in additive effects and increased risk of ventricular arrhythmias including torsade de pointes and sudden death. According to the manufacturer, prolongation of the QT interval has been reported very rarely in patients with impaired renal function whose dose/dosing interval of famotidine may not have been adjusted appropriately. In general, the risk of an individual agent or a combination of these agents causing ventricular arrhythmia in association with QT prolongation is largely unpredictable but may be increased by certain underlying risk factors such as congenital long QT syndrome, cardiac disease, and electrolyte disturbances (e.g., hypokalemia, hypomagnesemia). In addition, the extent of drug-induced QT prolongation is dependent on the particular drug(s) involved and dosage(s) of the drug(s).

MANAGEMENT: Caution and clinical monitoring are recommended if famotidine is used in combination with other drugs that can prolong the QT interval. Patients should be advised to seek prompt medical attention if they experience symptoms that could indicate the occurrence of torsade de pointes such as dizziness, lightheadedness, fainting, palpitation, irregular heart rhythm, shortness of breath, or syncope.

References

  1. "Product Information. Pepcid (famotidine)." Merck & Co., Inc PROD (2002):
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0

Switch to consumer interaction data

Moderate

magnesium hydroxide toremifene

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide) and toremifene

MONITOR: Bowel cleansing as well as overuse of certain laxatives may cause electrolyte loss and increase the risk of torsade de pointes ventricular arrhythmia in patients treated with drugs that prolong the QT interval. Electrolyte disturbances including hypokalemia and hypomagnesemia have been reported with laxative abuse and are known risk factors for torsade de pointes associated with QT interval prolongation.

MANAGEMENT: Patients treated with drugs that prolong the QT interval should exercise caution when self-medicating with laxatives. The recommended dosage and duration of use should not be exceeded. Patients treated with lactulose for more than six months should be monitored periodically for electrolyte imbalance. Patients should be advised to seek prompt medical attention if they experience symptoms that could indicate the occurrence of torsade de pointes such as dizziness, lightheadedness, fainting, palpitation, irregular heart rhythm, shortness of breath, or syncope.

References

  1. Chin RL "Laxative-induced hypokalemia." Ann Emerg Med 32 (1998): 517-8
  2. Muller-Lissner SA "Adverse effects of laxatives: fact and fiction." Pharmacology 47 (1993): 138-45
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  4. Canadian Pharmacists Association "e-CPS. http://www.pharmacists.ca/function/Subscriptions/ecps.cfm?link=eCPS_quikLink" (2006):
  5. Cerner Multum, Inc. "Australian Product Information." O 0
  6. Schaefer DC, Cheskin LJ "Constipation in the elderly." Am Fam Physician 58 (1998): 907-14
View all 6 references

Switch to consumer interaction data

Minor

famotidine calcium carbonate

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide) and Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide)

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

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

Switch to consumer interaction data

Minor

famotidine magnesium hydroxide

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide) and Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide)

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

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

Switch to consumer interaction data

Drug and food interactions

Moderate

calcium carbonate food

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide)

ADJUST DOSING INTERVAL: Administration with food may increase the absorption of calcium. However, foods high in oxalic acid (spinach or rhubarb), or phytic acid (bran and whole grains) may decrease calcium absorption.

MANAGEMENT: Calcium may be administered with food to increase absorption. Consider withholding calcium administration for at least 2 hours before or after consuming foods high in oxalic acid or phytic acid.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. Canadian Pharmacists Association "e-CPS. http://www.pharmacists.ca/function/Subscriptions/ecps.cfm?link=eCPS_quikLink" (2006):
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. Agencia Española de Medicamentos y Productos Sanitarios Healthcare "Centro de información online de medicamentos de la AEMPS - CIMA. https://cima.aemps.es/cima/publico/home.html" (2008):
  5. Mangels AR "Bone nutrients for vegetarians." Am J Clin Nutr 100 (2014): epub
  6. Davies NT "Anti-nutrient factors affecting mineral utilization." Proc Nutr Soc 38 (1979): 121-8
View all 6 references

Switch to consumer interaction data

Moderate

toremifene food

Applies to: toremifene

GENERALLY AVOID: Coadministration with grapefruit juice may theoretically increase the plasma concentrations of toremifene. The proposed mechanism is inhibition of CYP450 3A4-mediated metabolism by certain compounds present in grapefruit. Because toremifene is associated with dose- and concentration-dependent prolongation of the QT interval, increased levels may potentiate the risk of ventricular arrhythmias such as torsade de pointes and sudden death.

GENERALLY AVOID: Due to their estrogenic effect, isoflavones present in soy such as genistein and daidzein may stimulate breast tumor growth and antagonize the antiproliferative action of toremifene. Supportive data are derived primarily from in vitro and animal studies. In vitro, low concentrations of these phytoestrogens have been found to promote DNA synthesis and reverse the inhibitory effect of tamoxifen on oestrogen-dependent breast cancer cell proliferation. In contrast, high concentrations of genistein greater than 10 microM/L have been found to enhance tamoxifen effects by inhibiting breast cancer cell growth. It is not known if these high concentrations are normally achieved in humans. Plasma concentrations below 4 microM/L have been observed in healthy volunteers given a soy diet for one month or large single doses of genistein. These concentrations are comparable to the low plasma concentrations associated with tumor stimulation reported in animals. In a study of 155 female breast cancer survivors with substantially bothersome hot flashes, a product containing 50 mg of soy isoflavones (40% to 45% genistein; 40% to 45% daidzein; 10% to 20% glycitein) taken three times a day was found to be no more effective than placebo in reducing hot flashes. No toxicity or recurrence of breast cancer was reported during the 9-week study period.

MANAGEMENT: Until more information is available, patients treated with toremifene should consider avoiding the consumption of grapefruit juice and soy-containing products. Patients should be advised to contact their physician if they experience vaginal bleeding or potential signs of blood clots such as chest pain, shortness of breath, sudden loss of vision, and pain, redness or swelling in an extremity. Patients should seek immediate medical attention if they experience symptoms that could indicate the occurrence of torsade de pointes such as dizziness, palpitations, or syncope.

References

  1. "Product Information. Fareston (toremifene)." Schering Corporation PROD (2001):
  2. Therapeutic Research Faculty "Natural Medicines Comprehensive Database. http://www.naturaldatabase.com" (2008):

Switch to consumer interaction data

Minor

famotidine food

Applies to: Dual Action Complete (calcium carbonate / famotidine / magnesium hydroxide)

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

Switch to consumer interaction data

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

Report options

Loading...
QR code containing a link to this page

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