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Drug Interactions between isavuconazonium and nafcillin

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

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Interactions between your drugs

Moderate

nafcillin isavuconazonium

Applies to: nafcillin and isavuconazonium

MONITOR: Coadministration with inducers of CYP450 3A4 may decrease the plasma concentrations of isavuconazole, which is primarily metabolized by CYP450 3A4 and 3A5 and subsequently by uridine diphosphate glucuronosyltransferases (UGT). When multiple doses of isavuconazonium sulfate (prodrug of isavuconazole) were administered to healthy volunteers with multiple doses of the potent CYP450 3A4 inducer rifampin (600 mg), mean isavuconazole peak plasma concentration (Cmax) and systemic exposure (AUC) decreased by 75% and 97%, respectively. The extent to which other, less potent inducers of CYP450 3A4 may interact with isavuconazole is unknown.

MANAGEMENT: Caution is advised during concomitant use of isavuconazonium sulfate with CYP450 3A4 inducers. The potential for decreased efficacy of isavuconazonium sulfate should be considered.

References (1)
  1. (2015) "Product Information. Cresemba (isavuconazonium)." Astellas Pharma US, Inc

Drug and food interactions

Moderate

nafcillin food

Applies to: nafcillin

ADJUST DOSING INTERVAL: Certain penicillins may exhibit reduced gastrointestinal absorption in the presence of food. The therapeutic effect of the antimicrobial may be reduced.

MANAGEMENT: The interacting penicillin should be administered one hour before or two hours after meals. Penicillin V and amoxicillin are not affected by food and may be given without regard to meals.

References (6)
  1. Neu HC (1974) "Antimicrobial activity and human pharmacology of amoxicillin." J Infect Dis, 129, s123-31
  2. Welling PG, Huang H, Koch PA, Madsen PO (1977) "Bioavailability of ampicillin and amoxicillin in fasted and nonfasted subjects." J Pharm Sci, 66, p. 549-52
  3. McCarthy CG, Finland M (1960) "Absorption and excretion of four penicillins." N Engl J Med, 263, p. 315-26
  4. Cronk GA, Wheatley WB, Fellers GF, Albright H (1960) "The relationship of food intake to the absorption of potassium alpha-phenoxyethyl penicillin and potassium phenoxymethyl penicillin from the gastrointestinal tract." Am J Med Sci, 240, p. 219-25
  5. Klein JO, Sabath LD, Finland M (1963) "Laboratory studies on oxacillin. I: in vitro activity against staphylococci and some other bacterial pathogens. II: absorption and urinary excretion in normal young." Am J Med Sci, 245, p. 399-411
  6. Neuvonen PJ, Elonen E, Pentikainen PJ (1977) "Comparative effect of food on absorption of ampicillin and pivampicillin." J Int Med Res, 5, p. 71-6

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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