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Drug Interactions between Pyridium Plus and sonidegib

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

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Interactions between your drugs

Moderate

butabarbital sonidegib

Applies to: Pyridium Plus (butabarbital / hyoscyamine / phenazopyridine) and sonidegib

MONITOR: Coadministration with inducers of CYP450 3A4 may decrease the plasma concentrations of sonidegib, which is primarily metabolized by the isoenzyme. In 16 healthy volunteers, administration of a single 800 mg dose of sonidegib five days after starting treatment with the potent CYP450 3A4 inducer rifampin (600 mg daily for 14 days) decreased mean sonidegib peak plasma concentration (Cmax) and systemic exposure (AUC) by 54% and 72%, respectively, compared to administration of sonidegib alone. Simulations using physiologically-based pharmacokinetic (PBPK) models suggest that sonidegib steady-state AUC would decrease 56% in cancer patients taking sonidegib 200 mg once daily with the moderate CYP450 3A4 inducer efavirenz for 14 days, and 69% when coadministered with efavirenz for 4 months. No data are available for other, less potent CYP450 3A4 inducers.

MANAGEMENT: The potential for diminished pharmacologic effects of sonidegib should be considered during coadministration with CYP450 3A4 inducers. Alternative treatments may be required if an interaction is suspected.

References

  1. "Product Information. Odomzo (sonidegib)." Novartis Pharmaceuticals (2015):

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Drug and food interactions

Major

butabarbital food

Applies to: Pyridium Plus (butabarbital / hyoscyamine / phenazopyridine)

GENERALLY AVOID: Concurrent acute use of barbiturates and ethanol may result in additive CNS effects, including impaired coordination, sedation, and death. Tolerance of these agents may occur with chronic use. The mechanism is related to inhibition of microsomal enzymes acutely and induction of hepatic microsomal enzymes chronically.

MANAGEMENT: The combination of ethanol and barbiturates should be avoided.

References

  1. Gupta RC, Kofoed J "Toxological statistics for barbiturates, other sedatives, and tranquilizers in Ontario: a 10-year survey." Can Med Assoc J 94 (1966): 863-5
  2. Misra PS, Lefevre A, Ishii H, Rubin E, Lieber CS "Increase of ethanol, meprobamate and pentobarbital metabolism after chronic ethanol administration in man and in rats." Am J Med 51 (1971): 346-51
  3. Saario I, Linnoila M "Effect of subacute treatment with hypnotics, alone or in combination with alcohol, on psychomotor skills related to driving." Acta Pharmacol Toxicol (Copenh) 38 (1976): 382-92
  4. Stead AH, Moffat AC "Quantification of the interaction between barbiturates and alcohol and interpretation of fatal blood concentrations." Hum Toxicol 2 (1983): 5-14
  5. Seixas FA "Drug/alcohol interactions: avert potential dangers." Geriatrics 34 (1979): 89-102
View all 5 references

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Moderate

sonidegib food

Applies to: sonidegib

ADJUST DOSING INTERVAL: Food significantly increases the oral bioavailability of sonidegib. According to the product labeling, administration of sonidegib with a high-fat meal (approximately 1000 calories; 50% from fat) increased mean sonidegib peak plasma concentration (Cmax) and systemic exposure (AUC) by 7.4- to 7.8-fold.

GENERALLY AVOID: Grapefruit juice may increase the plasma concentrations of sonidegib. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands. Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition. Increased exposure to sonidegib may increase the risk of adverse effects such as musculoskeletal toxicity, fatigue, nausea, vomiting, diarrhea, anorexia, weight loss, alopecia, pruritus, and dysgeusia.

MANAGEMENT: Sonidegib should be administered on an empty stomach, at least 1 hour before or 2 hours after a meal. Patients should avoid consumption of grapefruit or grapefruit juice during treatment with sonidegib.

References

  1. "Product Information. Odomzo (sonidegib)." Novartis Pharmaceuticals (2015):

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Moderate

hyoscyamine food

Applies to: Pyridium Plus (butabarbital / hyoscyamine / phenazopyridine)

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

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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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