Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Some medicines, such as amprenavir, aprepitant, atazanavir, ciprofloxacin, darunavir, diltiazem, dronedarone, fosamprenavir, fosaprepitant, imatinib, or verapamil, may slow down how quickly your liver processes your pain medicine.
What might happen:
The amount of pain medicine in your blood may increase and you may become more drowsy than normal.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Your doctor may want to adjust the dose of your medicine.If you feel more sleepy or tired than normal, contact your healthcare professional as soon as possible.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Duragesic (fentanyl) US prescribing information. Janssen Pharmaceuticals, Inc. July, 2012.
2.OxyContin (oxycodone hydrochloride) US prescribing information. Perdue Pharma L.P. July, 2012.
3.Nitahara K, Matsunaga M, Katori K, Yotsui H, Higuchi H, Higa K. Effect of continuous low-dose intravenous diltiazem on epidural fentanyl analgesia after lower abdominal surgery. Br J Anaesth 2003 Apr;90(4):507-9.
4.Ahonen J, Olkkola KT, Salmenpera M, Hynynen M, Neuvonen PJ. Effect of diltiazem on midazolam and alfentanil disposition in patients undergoing coronary artery bypass grafting. Anesthesiology 1996 Dec;85(6):1246-52.
5.Kapur PA, Norel EJ, Dajee H, Cohen G, Flacke W. Haemodynamic effects of verapamil administration after large doses of fentanyl in man. Can Anaesth Soc J 1986 Mar;33(2):138-44.
6.Levin TT, Bakr MH, Nikolova T. Case report: delirium due to a diltiazem-fentanyl CYP3A4 drug interaction. Gen Hosp Psychiatry 2010 Nov-Dec;32(6):648.e9-648.e10.