Transdermal Buprenorphine Relieves Neuropathic Pain: A Randomized, Double-Blind, Parallel-Group, Placebo-Controlled Trial in Diabetic Peripheral Neuropathic Pain.
To evaluate the efficacy and safety of transdermal buprenorphine in patients with diabetic peripheral neuropathic pain (DPNP).



This multicenter, randomized, double-blind, placebo-controlled, parallel-group trial enrolled patients with type 1 or type 2 diabetes and stable glycemic control who had been experiencing moderate to severe DPNP for at least 6 months on maximal tolerated conventional therapy. Patients were randomly assigned to receive buprenorphine (5 μg/h) or placebo patches. The dose was titrated to effect to a maximum of 40 μg/h. Paracetamol was available as rescue analgesia. The severity of pain and other symptoms of DPNP were assessed daily in a patient diary and at clinic visits.



One hundred eight-six patients were enrolled, with 93 randomized to either buprenorphine or placebo. A high proportion of patients did not complete the study (buprenorphine 37 of 93, placebo 24 of 93). The main reason for premature withdrawal in the buprenorphine group was adverse events commonly due to untreated nausea and/or vomiting. Among the per-protocol population, more patients in the buprenorphine group (86.3%) experienced a 30% reduction in average versus baseline pain at week 12 than those in the placebo group (56.6%, P < 0.001). A nonsignificant trend favored the buprenorphine group within the intention-to-treat analysis of the same end point (51.7% vs. 41.3%, P = 0.175).



Transdermal buprenorphine, when tolerated, is an effective therapy for DPNP and provides another option to manage this challenging painful condition. Nausea and constipation need to be managed proactively to optimize treatment outcomes.
Eastern Clinical Research Unit, Eastern Health, Box Hill Hospital, Box Hill, VIC, Australia richard.simpson@iinet.net.au.
Richard W
RW
Simpson
Consulting Services, New Lambton, NSW, Australia.
John H
JH
Wlodarczyk
D000082:Acetaminophen / Q000627:therapeutic use; D000279:Administration, Cutaneous; D000328:Adult; D000368:Aged; D018712:Analgesics, Non-Narcotic / Q000627:therapeutic use; D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects; D002047:Buprenorphine / Q000008:administration & dosage* / Q000009:adverse effects; D003922:Diabetes Mellitus, Type 1 / Q000150:complications; D003924:Diabetes Mellitus, Type 2 / Q000150:complications; D003929:Diabetic Neuropathies / Q000150:complications / Q000188:drug therapy*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D057194:Intention to Treat Analysis; D008297:Male; D008875:Middle Aged; D009325:Nausea / Q000139:chemically induced; D009437:Neuralgia / Q000188:drug therapy* / Q000209:etiology; D016896:Treatment Outcome; D014839:Vomiting / Q000139:chemically induced; D028761:Withholding Treatment
D018712:Analgesics, Non-Narcotic; D000701:Analgesics, Opioid; D000082:Acetaminophen; D002047:Buprenorphine