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Drug Interactions between Ditropan and isavuconazonium

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

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Interactions between your drugs

Moderate

oxyBUTYnin isavuconazonium

Applies to: Ditropan (oxybutynin) and isavuconazonium

MONITOR: Coadministration with isavuconazonium sulfate (prodrug of isavuconazole) may increase the plasma concentrations of drugs that are substrates of CYP450 3A4 and/or P-glycoprotein (P-gp). The mechanism is decreased clearance due to inhibition of CYP450 3A4 activity and/or P-gp-mediated efflux of these drugs by isavuconazole. In pharmacokinetic studies, isavuconazole increased the systemic exposure (AUC) of sensitive CYP450 3A4 substrates midazolam, sirolimus, and tacrolimus by approximately 2-fold, thus it can be considered a moderate inhibitor of the isoenzyme.

MANAGEMENT: Caution is advised when isavuconazonium sulfate is used concomitantly with drugs that are substrates of the CYP450 3A4 isoenzyme or the P-gp transport protein, particularly those with a narrow therapeutic range. Dosage adjustments as well as clinical and laboratory monitoring may be appropriate for some drugs whenever isavuconazonium sulfate is added to or withdrawn from therapy.

References (4)
  1. (2025) "Product Information. Cresemba (isavuconazole)." Pfizer Australia Pty Ltd
  2. (2025) "Product Information. Cresemba (isavuconazole)." Pfizer Ltd
  3. (2025) "Product Information. Cresemba (isavuconazonium)." Astellas Pharma US, Inc
  4. (2024) "Product Information. Cresemba (isavuconazole)." Avir Pharma Inc

Drug and food interactions

Moderate

oxyBUTYnin food

Applies to: Ditropan (oxybutynin)

GENERALLY AVOID: Use of anticholinergic agents with alcohol may result in sufficient impairment of attention so as to render driving and operating machinery more hazardous. In addition, the potential for abuse may be increased with the combination. The mechanism of interaction is not established but may involve additive depressant effects on the central nervous system. No effect of oral propantheline or atropine on blood alcohol levels was observed in healthy volunteers when administered before ingestion of a standard ethanol load. However, one study found impairment of attention in subjects given atropine 0.5 mg or glycopyrrolate 1 mg in combination with alcohol.

MANAGEMENT: Alcohol should generally be avoided during therapy with anticholinergic agents. Patients should be counseled to avoid activities requiring mental alertness until they know how these agents affect them.

References (1)
  1. Linnoila M (1973) "Drug effects on psychomotor skills related to driving: interaction of atropine, glycopyrrhonium and alcohol." Eur J Clin Pharmacol, 6, p. 107-12

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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