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Drug Interactions between Cardoxin and Glauctabs

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

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Interactions between your drugs

Moderate

digoxin methazolAMIDE

Applies to: Cardoxin (digoxin) and Glauctabs (methazolamide)

MONITOR: Although diuretics and digitalis glycosides are frequently and appropriately used together, diuretic-induced hypokalemia and hypomagnesemia may predispose patients on digitalis to arrhythmias.

MANAGEMENT: Digoxin, potassium and magnesium levels should be followed closely. Hypokalemia and hypomagnesemia should be treated appropriately. Digitalis dose adjustments may be required. Patients should be advised to notify their physicians if they experience signs of possible digoxin toxicity or electrolyte disturbances, such as weakness, lethargy, muscle pains or cramps, nausea, anorexia, visual disturbances, or irregular heartbeats.

References

  1. Tilstone WJ, Semple PF, Lawson DH, Boyle JA "Effects of furosemide on glomerular filtration rate and clearance of practolol, digoxin, cephaloridine, and gentamicin." Clin Pharmacol Ther 22 (1977): 389-94
  2. Semple P, Tilstone WJ, Lawson DH "Furosemide and urinary digoxin clearance." N Engl J Med 293 (1975): 612-3
  3. Brown DD, Dormois JC, Abraham GN, et al. "Effect of furosemide on the renal excretion of digoxin." Clin Pharmacol Ther 20 (1976): 395-400
  4. McAllister RG, Howell SM, Gomer MS, Selby JB "Effect of intravenous furosemide on the renal excretion of digoxin." J Clin Pharmacol 16 (1976): 110-7
  5. Malcolm AD, Leung FY, Fuchs JC, Duarte JE "Digoxin kinetics during furosemide administration." Clin Pharmacol Ther 21 (1977): 567-74
  6. Waldorff S, Hansen PB, Kjaergard H, Buch J, Egeblad H, Steiness E "Amiloride-induced changes in digoxin dynamics and kinetics: abolition of digoxin-induced inotropism with amiloride." Clin Pharmacol Ther 30 (1981): 172-6
  7. Macolic V, Vrhovac B "Pharmacokinetics and interactions of digoxin, theophylline and furosemide in diseases with edema." Int J Clin Pharmacol Ther Toxicol 31 (1993): 6-11
  8. Whang R, Oei TO, Watanabe A "Frequency of hypomagnesemia in hospitalized patients receiving digitalis." Arch Intern Med 145 (1985): 655-6
  9. Cohen L, Kitzes R "Magnesium Sulfate and digitalis-toxic arrhythmias." JAMA 249 (1983): 2808-10
  10. Leary WP, Reyes AJ "Drug interactions with diuretics." S Afr Med J 65 (1984): 455-61
View all 10 references

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Drug and food interactions

Minor

digoxin food

Applies to: Cardoxin (digoxin)

Administration of digoxin with a high-fiber meal has been shown to decrease its bioavailability by almost 20%. Fiber can sequester up to 45% of the drug when given orally. Patients should be advised to maintain a regular diet without significant fluctuation in fiber intake while digoxin is being titrated.

Grapefruit juice may modestly increase the plasma concentrations of digoxin. The mechanism is increased absorption of digoxin due to mild inhibition of intestinal P-glycoprotein by certain compounds present in grapefruits. In 12 healthy volunteers, administration of grapefruit juice with and 30 minutes before, as well as 3.5, 7.5, and 11.5 hours after a single digoxin dose (0.5 mg) increased the mean area under the plasma concentration-time curve (AUC) of digoxin by just 9% compared to administration with water. Moreover, P-glycoprotein genetic polymorphism does not appear to influence the magnitude of the effects of grapefruit juice on digoxin. Thus, the interaction is unlikely to be of clinical significance.

References

  1. Darcy PF "Nutrient-drug interactions." Adverse Drug React Toxicol Rev 14 (1995): 233-54
  2. Becquemont L, Verstuyft C, Kerb R, et al. "Effect of grapefruit juice on digoxin pharmacokinetics in humans." Clin Pharmacol Ther 70 (2001): 311-6

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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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