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Drug Interactions between acetaminophen / benzhydrocodone and tovorafenib

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

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Interactions between your drugs

Moderate

benzhydrocodone tovorafenib

Applies to: acetaminophen / benzhydrocodone and tovorafenib

Consumer information for this interaction is not currently available.

MONITOR: Coadministration with inducers of CYP450 3A4 may decrease the plasma concentrations of opioids that are metabolized by the isoenzyme such as butorphanol, fentanyl, hydrocodone, methadone, and oxycodone. Reduced efficacy or withdrawal symptoms may occur in patients maintained on their narcotic pain regimen following the addition of a CYP450 3A4 inducer. Conversely, discontinuation of the inducer may increase opioid plasma concentrations and potentiate the risk of overdose and fatal respiratory depression.

MANAGEMENT: Pharmacologic response to the opioid should be monitored more closely whenever a CYP450 3A4 inducer is added to or withdrawn from therapy, and the opioid dosage adjusted as necessary.

References

  1. Holmes VF (1991) "Rifampin-induced methadone withdrawal in AIDS." J Clin Psychopharmacol, 10, p. 443-4
  2. Liu S-J, Wang RI (1984) "Case report of barbiturate-induced enhancement of methadone metabolism and withdrawal syndrome." Am J Psychiatry, 141, p. 1287-8
  3. Bell J, Seres V, Bowron P, Lewis J, Batey R (1988) "The use of serum methadone levels in patients receiving methadone maintenance." Clin Pharmacol Ther, 43, p. 623-9
  4. Finelli PF (1976) "Phenytoin and methadone tolerance." N Engl J Med, 294, p. 227
  5. Tong TG, Pond SM, Kreek MJ, et al. (1981) "Phenytoin-induced methadone withdrawal." Ann Intern Med, 94, p. 349-51
  6. Kreek MJ, Garfield JW, Gutjahr CL, Giusti LM (1976) "Rifampin-induced methadone withdrawal." N Engl J Med, 294, p. 1104-6
  7. Bending MR, Skacel PO (1977) "Rifampicin and methadone withdrawal." Lancet, 1, p. 1211
  8. "Product Information. Duragesic Transdermal System (fentanyl)." Janssen Pharmaceutica, Titusville, NJ.
  9. (2001) "Product Information. OxyContin (oxycodone)." Purdue Frederick Company
  10. Raistrick D, Hay A, Wolff K (1996) "Methadone maintenance and tuberculosis treatment." BMJ, 313, p. 925-6
  11. Altice FL, Friedland GH, Cooney EL (1999) "Nevirapine induced opiate withdrawal among injection drug users with HIV infection receiving methadone." AIDS, 13, p. 957-62
  12. Otero MJ, Fuertes A, Sanchez R, Luna G (1999) "Nevirapine-induced withdrawal symptoms in HIV patients on methadone maintenance programme: an alert." AIDS, 13, p. 1004-5
  13. Pinzani V, Faucherre V, Peyriere H, Blayac JP (2000) "Methadone withdrawal symptoms with nevirapine and efavirenz." Ann Pharmacother, 34, p. 405-7
  14. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  15. (2006) "Product Information. Ionsys (fentanyl)." Ortho McNeil Pharmaceutical
  16. (2007) "Product Information. Diskets (methadone)." Cebert Pharmaceuticals Inc
  17. Cerner Multum, Inc. "Australian Product Information."
  18. (2013) "Product Information. Zohydro ER (hydrocodone)." Zogenix, Inc
  19. (2017) "Product Information. Butorphanol Tartrate (butorphanol)." Apotex Corporation
View all 19 references

Drug and food interactions

Major

benzhydrocodone food

Applies to: acetaminophen / benzhydrocodone

Do not use alcohol or medications that contain alcohol while you are receiving treatment with benzhydrocodone. This may increase nervous system side effects such as drowsiness, dizziness, lightheadedness, difficulty concentrating, and impairment in thinking and judgment. In severe cases, low blood pressure, respiratory distress, fainting, coma, or even death may occur. If you are taking certain long-acting formulations of hydrocodone, consumption of alcohol may also cause rapid release of the drug, resulting in high blood levels that may be potentially lethal. Likewise, you should avoid consuming grapefruit and grapefruit juice, as this may increase the blood levels and effects of hydrocodone. Talk to your doctor or pharmacist if you have questions on how to take this or other medications you are prescribed. Do not use more than the recommended dose of benzhydrocodone, and avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medication without first talking to your doctor.

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Major

acetaminophen food

Applies to: acetaminophen / benzhydrocodone

Ask your doctor before using acetaminophen together with ethanol. This can cause serious side effects that affect your liver. Call your doctor immediately if you experience a fever, chills, joint pain or swelling, excessive tiredness or weakness, unusual bleeding or bruising, skin rash or itching, loss of appetite, nausea, vomiting, or yellowing of the skin or the whites of your eyes. If your doctor does prescribe these medications together, you may need a dose adjustment or special tests to safely take both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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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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