Increased Sensitivity to Pain Caused by Opioids in People Who Have Abused Prescription Opioids
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Opioid-Induced Hyperalgesia in Prescription Opioid Abusers: Effects of Pregabalin|
- Improved Pain Response, threshold and tolerance [ Time Frame: 8 weeks ] [ Designated as safety issue: No ]
To test the efficacy of PGB, compared to placebo, to diminish OIH, as evidenced by improved pain responses (threshold and tolerance) to experimentally induced cold-pressor pain, in a well-described sample of POA patients with chronic pain and on buprenorphine or methadone therapy.
- Pain Threshold: On the CP assay, pain threshold is operationalized as the number of seconds after the onset of the painful stimulus when a painful sensation is first detected. Subjects will indicate threshold by saying "Pain."
- Pain Tolerance: On the CP assay, pain tolerance is operationalized as the number of seconds after the onset of the painful stimulus when the painful sensation is subjectively intolerable. Subjects will indicate tolerance by removing their arm from the ice bath.
- Improvement in pain severity and daily functionality [ Time Frame: 8 weeks ] [ Designated as safety issue: No ]
To test the efficacy of PGB, compared to placebo, to diminish chronic pain, as evidenced by improvements in pain severity and functionality in a well-described sample of POA patients with chronic pain and on buprenorphine or methadone therapy.
Pain Severity will be measured with The McGill Pain Questionnaire. Daily Functionality will be measured with the Brief Pain Inventory
|Study Start Date:||March 2013|
|Study Completion Date:||January 2016|
|Primary Completion Date:||January 2016 (Final data collection date for primary outcome measure)|
Pregabalin 400mg / Day
Titration of intervention will begin with 50mg PO BID x 2 days, then 100mg PO BID x 2 days, then 150mg PO BID X 2 days, then on day 7 full dose of Pregabalin 400mg PO QD for six weeks
Other Name: Lyrica
Placebo Comparator: Placebo Control
Placebo group will follow the same titration as the pregabalin group
The clinical management of pain in prescription opioid abusers presents a challenge to the health care professional. Investigators have novel pilot data showing that the GABA-agonist gabapentin (GPN) significantly decreases opioid-induced hyperalgesia (OIH) in methadone patients (Compton et al., 2009), providing the first empirical evidence of a pharmacotherapy for OIH in opioid abusers. The work of Gore and colleagues (2011) showed that pregabalin (PGB), a GABA analogue succeeding GPN, was shown to decrease opioid use in patients with neuropathic pain in patients, suggesting an anti-hyperalgesia effect not observed in the matched cohort receiving GPN. The proposed research will comprehensively evaluate the efficacy of PGB in treating opioid-induced hyperalgesia (OIH) in a well-described population of prescription opioid abusers (POAs) with chronic pain and on Suboxone (buprenorphine) or methadone therapy. A pressing need for such investigation is presented by the rising number of POAs presenting for treatment (SAMHSA, 2010; 2011), and for whom, chronic pain is a common co-morbidity. The proposed work is anticipated to provide vital and timely information on the efficacy of PGB in the treatment of OIH in prescription opioid abusers on Suboxone or methadone therapy.
Following recruitment and screening, 75 subjects assigned to the active medication group will receive pregabalin 400 mg/day, a dose well-within published guidelines of 300-600 mg/day for the treatment of neuropathic pain (http://www.pfizerpro.com/hcp/lyrica/phndosing). During the first week of treatment, subjects will be quickly titrated up to the assigned daily PGB dose of 400 mg/day PO (50mg BID x 2 days; 100mg BID x 2 days; 150mg BID x 2 days, with full dosage of 400mg administered on day 7 ), or maximum dose tolerated) for six weeks. 75 subjects will be assigned to receive matched and undergo identical titration and study activities under double-blind conditions. Study staff will evaluate subjects daily by phone during titration; thereafter they will be seen weekly at study sessions. Tapering of medication will begin at the end of week 6. The severity of chronic pain will be measured at each time point using two standardized self report tools which report on pain severity (McGill Pain Questionnaire) and pain-related disability (Brief Pain Inventory). Opioid-induced hyperalgesia will be measured at each time point using a standardized cold pressor trial, and performance at baseline will be compared to performance following PGB/placebo administration over time.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01821430
|United States, District of Columbia|
|Washington, District of Columbia, United States, 20007|
|Principal Investigator:||Peggy Compton, RN, PhD||Georgetown University|