Journal of pain & palliative care pharmacotherapy
-
J Pain Palliat Care Pharmacother · Aug 2013
Potential P-glycoprotein pharmacokinetic interaction of telaprevir with morphine or methadone.
Telaprevir (TVR) effects on P-glycloprotein and cytochrome P450 (CYP) may significantly elevate serum levels of morphine and methadone. Recent literature points to major interactions when combining TVR with warfarin or rifampin. Opioid interactions are especially dangerous in hepatitis C patients, as coinfection with human immunodeficiency virus (HIV) and hepatitis C virus (HCV) occurs in 50-90% of HIV-infected drug users that are prescribed opioids for chronic pain and/or methadone for maintenance. ⋯ Current recommendations minimize potential drug interactions between telaprevir and opioids, especially methadone, based on a single 7-day trial. We outline the various pharmacokinetic mechanisms involved when combining TVR with methadone or morphine and recommend that current data are not sufficiently robust to minimize the potentially significant interaction with opioids, especially methadone. Clinicians must be mindful of these understated interactions, know that the opioid dose may need to be significantly increased or reduced, and use caution during upward titration of opioids affected by these enzyme systems.
-
Differences between acute and chronic pain are discussed and predisposing factors for acute pain becoming chronic are listed. Some measures to prevent the transition form acute to chronic pain are described.
-
J Pain Palliat Care Pharmacother · Aug 2013
CommentExamining influences on the availability of and access to opioids for pain management and palliative care.
This commentary relates to the recently published essay in PLOS Medicine, entitled "Untreated Pain, Narcotics Regulation, and Global Health Ideologies." That essay describes regulatory and other systemic barriers preventing the accessibility of opioid analgesics and contributing to patients not receiving adequate pain relief. Four main points highlighted in the essay are discussed in this commentary: (1) the role of international treaties in medication availability; (2) the role of the International Narcotics Control Board in medication availability; (3) the role of regulatory policy in treating pain; and (4) the role of opioid analgesics in treating pain. Recent authoritative statements and activities suggest a strengthened infrastructure within which governments currently can work to improve the availability of controlled medicines to enhance patient pain and palliative care services.