Skip to main content

Drug Interactions between Digitek and Fenex-PSE

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

Edit list (add/remove drugs)

Interactions between your drugs

Moderate

digoxin pseudoephedrine

Applies to: Digitek (digoxin) and Fenex-PSE (guaifenesin / pseudoephedrine)

MONITOR: The concomitant use of sympathomimetic agents and cardiac glycosides may increase the risk of cardiac arrhythmias. The mechanism of this interaction is not known. Increased ectopic pacemaker activity has been reported to occur in patients taking digoxin in combination with pseudoephedrine.

MANAGEMENT: Caution should be exercised if these two drugs are coadministered. Electrocardiogram monitoring (ECG) is recommended. The use of epinephrine (adrenaline) with high doses of digitalis glycosides is not recommended.

References

  1. "Product Information. Isuprel (isoproterenol)." Sanofi Winthrop Pharmaceuticals PROD (2001):
  2. "Product Information. Lanoxin (digoxin)." Glaxo Wellcome PROD (2001):
  3. "Product Information. EPINEPHrine Hydrochloride (EPINEPHrine)." Abbott Pharmaceutical (2022):
  4. "Product Information. Claritin-D (loratadine-pseudoephedrine)." Schering-Plough PROD (2001):
  5. "Product Information. Allegra-D (fexofenadine-pseudoephedrine)." Chattem Consumer Products PROD (2001):
  6. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  7. Cerner Multum, Inc. "Australian Product Information." O 0
View all 7 references

Switch to consumer interaction data

Drug and food interactions

Moderate

pseudoephedrine food

Applies to: Fenex-PSE (guaifenesin / pseudoephedrine)

MONITOR: Coadministration of two or more sympathomimetic agents may increase the risk of adverse effects such as nervousness, irritability, and increased heart rate. Central nervous system (CNS) stimulants, particularly amphetamines, can potentiate the adrenergic response to vasopressors and other sympathomimetic agents. Additive increases in blood pressure and heart rate may occur due to enhanced peripheral sympathetic activity.

MANAGEMENT: Caution is advised if two or more sympathomimetic agents are coadministered. Pulse and blood pressure should be closely monitored.

References

  1. Rosenblatt JE, Lake CR, van Kammen DP, Ziegler MG, Bunney WE Jr "Interactions of amphetamine, pimozide, and lithium on plasma norepineophrine and dopamine-beta-hydroxylase in schizophrenic patients." Psychiatry Res 1 (1979): 45-52
  2. Cavanaugh JH, Griffith JD, Oates JA "Effect of amphetamine on the pressor response to tyramine: formation of p-hydroxynorephedrine from amphetamine in man." Clin Pharmacol Ther 11 (1970): 656
  3. "Product Information. Adderall (amphetamine-dextroamphetamine)." Shire Richwood Pharmaceutical Company Inc PROD (2001):
  4. "Product Information. Tenuate (diethylpropion)." Aventis Pharmaceuticals PROD (2001):
  5. "Product Information. Sanorex (mazindol)." Novartis Pharmaceuticals PROD (2001):
  6. "Product Information. Focalin (dexmethylphenidate)." Mikart Inc (2001):
  7. "Product Information. Strattera (atomoxetine)." Lilly, Eli and Company (2002):
View all 7 references

Switch to consumer interaction data

Minor

digoxin food

Applies to: Digitek (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

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