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Drug Interactions between tolvaptan and viloxazine

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

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Interactions between your drugs

Moderate

tolvaptan viloxazine

Applies to: tolvaptan and viloxazine

MONITOR: Coadministration with viloxazine may increase the plasma concentrations of drugs that are substrates of CYP450 3A4 and/or CYP450 2D6 leading to increased toxicity. The proposed mechanism is decreased clearance due to viloxazine-mediated inhibition of CYP450 3A4 and/or CYP450 2D6. The product labeling describes viloxazine as a weak inhibitor of CYP450 3A4 and CYP450 2D6.

MANAGEMENT: Caution is advised if viloxazine is used concomitantly with drugs that are substrates of CYP450 3A4 and/or CYP450 2D6, particularly those with a narrow therapeutic range. Monitor for adverse reactions of the CYP450 3A4 or CYP450 2D6 substrate and adjust dosages as needed.

References (1)
  1. (2021) "Product Information. Qelbree (viloxazine)." Supernus Pharmaceuticals Inc

Drug and food interactions

Moderate

tolvaptan food

Applies to: tolvaptan

GENERALLY AVOID: Grapefruit juice may significantly increase the plasma concentrations of tolvaptan. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruits. According to the product labeling, administration of tolvaptan with grapefruit juice resulted in a 1.8-fold increase in tolvaptan systemic exposure. The clinical significance is unknown, although increased pharmacologic effects may be expected. Too rapid correction of hyponatremia increases the risk of osmotic demyelination syndrome, which is associated with dysarthria, mutism, dysphagia, lethargy, affective changes, spastic quadriparesis, seizures, coma, and death.

MANAGEMENT: Patients treated with tolvaptan should avoid consumption of grapefruits and grapefruit juice.

References (1)
  1. (2009) "Product Information. Samsca (tolvaptan)." Otsuka American Pharmaceuticals Inc

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

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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