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Drug Interactions between Agenerase and Zolpimist

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

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Interactions between your drugs

Moderate

zolpidem amprenavir

Applies to: Zolpimist (zolpidem) and Agenerase (amprenavir)

MONITOR: Coadministration with inhibitors of CYP450 3A4 may increase the plasma concentrations of zolpidem, which is partially metabolized by the isoenzyme. When a single 5 mg dose of zolpidem was administered to 12 healthy study subjects following treatment with the potent CYP450 3A4 inhibitor ketoconazole (200 mg twice daily for 2 days), zolpidem peak plasma concentration (Cmax) and systemic exposure (AUC) increased by 35% and 67%, respectively. Increased sedation and other pharmacodynamic effects were noted.

MANAGEMENT: Caution is advised when zolpidem is used with CYP450 3A4 inhibitors. Patients should be advised to avoid driving, operating machinery, or engaging in potentially hazardous activities requiring mental alertness and motor coordination until they know how the medications affect them, and to notify their physician if they experience excessive somnolence or dizziness.

References

  1. "Product Information. Ambien (zolpidem)." sanofi-aventis PROD (2001):
  2. "Product Information. Norvir (ritonavir)." Abbott Pharmaceutical PROD (2001):
  3. Luurila H, Kivisto KT, Neuvonen PJ "Effect of itraconazole on the pharmacokinetics and pharmacodynamics of zolpidem." Eur J Clin Pharmacol 54 (1998): 163-6
  4. Greenblatt DJ, vonMoltke LL, Harmatz JS, Mertzanis P, Graf JA, Durol ALB, Counihan M, RothSchechter B, Shader RI "Kinetic and dynamic interaction study of zolpidem with ketoconazole, itraconazole, and fluconazole." Clin Pharmacol Ther 64 (1998): 661-71
  5. Greenblatt DJ, von Moltke LL, Harmatz JS, et al. "Differential impairment of triazolam and zolpidem clearance by ritonavir." J Acquir Immune Defic Syndr 24 (2000): 129-36
  6. Saari TI, Laine K, Leino K, Valtonen M, Neuvonen PJ, Olkkola KT "Effect of voriconazole on the pharmacokinetics and pharmacodynamics of zolpidem in healthy subjects." Br J Clin Pharmacol 63 (2007): 116-20
  7. Farkas D, Volak L, Harmatz J, von Moltke L, Court M, Greenblatt D "Short-term clarithromycin administration impairs clearance and enhances pharmacodynamic effects of trazodone but not of zolpidem." Clin Pharmacol Ther 85 (2009): 644-50
View all 7 references

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Drug and food interactions

Moderate

zolpidem food

Applies to: Zolpimist (zolpidem)

GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of zolpidem. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.

ADJUST DOSING INTERVAL: Administration of zolpidem with food may delay the onset of hypnotic effects. In 30 healthy subjects, administration of zolpidem 20 minutes after a meal resulted in decreased mean peak plasma drug concentration (Cmax) and area under the concentration-time curve (AUC) by 25% and 15%, respectively, compared to fasting. The time to reach peak plasma drug concentration (Tmax) was prolonged by 60%, from 1.4 to 2.2 hours.

MANAGEMENT: Patients receiving zolpidem should be advised to avoid the consumption of alcohol. For faster sleep onset, zolpidem should not be administered with or immediately after a meal.

References

  1. "Product Information. Ambien (zolpidem)." sanofi-aventis PROD (2001):
  2. Yamreudeewong W, Henann NE, Fazio A, Lower DL, Cassidy TG "Drug-food interactions in clinical practice." J Fam Pract 40 (1995): 376-84

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Moderate

amprenavir food

Applies to: Agenerase (amprenavir)

GENERALLY AVOID: Administration with a high-fat meal may decrease the oral bioavailability of amprenavir. The mechanism is unknown. In healthy volunteers, consumption of a standardized high-fat meal decreased the peak plasma concentration (Cmax) and area under the concentration-time curve (AUC) of amprenavir (1200 mg single oral dose) by 36% and 21%, respectively, compared to administration in the fasted state. The time to reach Cmax (Tmax) was increased 44% following a high-fat meal.

Grapefruit juice does not appear to significantly affect the pharmacokinetics of amprenavir. In 12 healthy volunteers, administration with grapefruit juice (200 mL) decreased the mean peak plasma concentration (Cmax) of amprenavir (1200 mg single oral dose) by 22% compared to water. The median time to reach Cmax (Tmax) was prolonged from 0.75 to 1.13 hours. These pharmacokinetic changes are not thought to be clinically significant, since antiretroviral response is more closely associated with systemic exposure (AUC) and trough plasma concentration (Cmin), which were not affected in the study.

MANAGEMENT: Amprenavir may be taken with or without food, but should not be taken with a high-fat meal.

References

  1. "Product Information. Agenerase (amprenavir)." Glaxo Wellcome PROD (2001):
  2. Demarles D, Gillotin C, Bonaventure-Paci S, Vincent I, Fosse S, Taburet AM "Single-dose pharmacokinetics of amprenavir coadministered with grapefruit juice." Antimicrob Agents Chemother 46 (2002): 1589-1590

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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.

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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

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