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Drug Interactions between fostamatinib and Recede

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

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Interactions between your drugs

Moderate

benzphetamine fostamatinib

Applies to: Recede (benzphetamine) and fostamatinib

MONITOR: Coadministration with fostamatinib may increase the plasma concentrations of drugs that are substrates of the CYP450 3A4 isoenzyme and/or P-glycoprotein (P-gp) transporter. The proposed mechanism is decreased clearance in the intestine and/or liver due to inhibition of CYP450 3A4-mediated metabolism and P-gp-mediated efflux by fostamatinib. According to the product labeling, administration of a single 40 mg dose of the CYP450 3A4 substrate simvastatin with fostamatinib 100 mg twice daily increased simvastatin peak plasma concentration (Cmax) and systemic exposure (AUC) by 113% and 64%, respectively. In addition, simvastatin acid Cmax increased by 83% and AUC increased by 64%. When the P-gp substrate digoxin (0.25 mg once daily) was administered with fostamatinib (100 mg twice daily), digoxin Cmax and AUC increased by 70% and 37%, respectively.

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as well as clinical and laboratory monitoring may be appropriate for some drugs whenever fostamatinib is added to or withdrawn from therapy.

References (1)
  1. (2018) "Product Information. Tavalisse (fostamatinib)." Rigel Pharmaceuticals

Drug and food interactions

Moderate

benzphetamine food

Applies to: Recede (benzphetamine)

GENERALLY AVOID: Alcohol may potentiate the central nervous system and cardiovascular effects of centrally-acting appetite suppressants. In one study, concurrent administration of methamphetamine (30 mg intravenously) and ethanol (1 gm/kg orally over 30 minutes) increased heart rate by 24 beats/minute compared to methamphetamine alone. This increases cardiac work and myocardial oxygen consumption, which may lead to more adverse cardiovascular effects than either agent alone. Subjective effects of ethanol were diminished in the eight study subjects, but those of methamphetamine were not affected. The pharmacokinetics of methamphetamine were also unaffected except for a decrease in the apparent volume of distribution at steady state.

MANAGEMENT: Concomitant use of centrally-acting appetite suppressants and alcohol should be avoided if possible, especially in patients with a history of cardiovascular disease. Patients should be counselled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.

References (3)
  1. Mendelson J, Jones RT, Upton R, Jacob P 3rd (1995) "Methamphetamine and ethanol interactions in humans." Clin Pharmacol Ther, 57, p. 559-68
  2. (2001) "Product Information. Didrex (benzphetamine)." Pharmacia and Upjohn
  3. (2012) "Product Information. Suprenza (phentermine)." Akrimax Pharmaceuticals

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.