Efficacy and Safety of Topical Versus Systemic Treatment in Postherpetic Neuralgia and Diabetic Polyneuropathic Pain

Study Overview
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Brief Summary
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The purpose of this study is to evaluate lidocaine as topical treatment for peripheral neuropathic pain (as stand-alone treatment and in combination with systemic treatment)

Official Title
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Safety and Efficacy of Lidocaine 5% Medicated Plaster in Comparison to Systemic Treatment in Postherpetic Neuralgia and Diabetic Polyneuropathic Pain.

Conditions
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Neuropathic Pain

Intervention / Treatment
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* Drug: Topical analgesic
* Drug: oral intake
* Drug: Topical analgesic


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female subjects with >= 18 years of age Intact skin in the area of topical treatment Creatinine clearance CLCR >= 30 mL/min NRS-3 > 4 (recalled average pain intensity during the last 3 days) Subjects with DPN Controlled, treated type 1 or 2 diabetes mellitus with glycosylated hemoglobin (Hba1c)<= 11% Painful, distal symmetrical, sensomotor polyneuropathy of the lower extremities for >= 3 months (below the knees on both extremities) with at least 2 of the following symptoms present: burning, sensation, tingling or prickling, numbness from time to time, painful heat or cold sensation (e.g. warm or cold water) Subjects with PHN Subjects with PHN and neuropathic pain present for >= 3 months after healing of the herpes zoster skin rash. Without neurolytic neurosurgical therapy for their condition. Exclusion Criteria: General Evidence or history of alcohol, medication or drug abuse and/or dependency in the past 2 years, unstable psychological personality requiring intermittent or permanent treatment. Psychiatric illness (subjects with well-controlled depression or anxiety disorder may participate if they are not taking any of the prohibited medications defined (below), epilepsy or suicide risk. Pregnant or breastfeeding women Women of childbearing potential who are sexually active without satisfactory contraception for at least 28 days prior to enrollment, during the trial, and until 28 days after the follow-up visit. Subjects with severe cardiac impairment e.g. NYHA class > 3, myocardial infarction less than 6 months prior to enrollment, and/or unstable angina pectoris. Subjects with severe hepatic disorder and/or AST or ALT >= 3x the upper limit of normal. Subjects with known or suspected severe renal failure (CLCR < 30 mL/min). Anticipated need for surgery during the trial, requiring at least regional or general anesthesia. Subjects who are undergoing active treatment for cancer, are known to be infected with HIV or being acutely and intensively immunosuppressed following transplantation. Participation in another trial of investigational medicinal products or devices parallel to or less than 1 month before entry into the trial, or previous participation in this trial. Trial specific: Any concomitant use of drugs for the treatment of neuropathic pain or commonly used for the treatment of neuropathic pain. Use of transcutaneous electrical nerve stimulations (TENS) after enrollment. CLCR < 30 mL/min Evidence of another cause for pain in the area of neuropathic pain such as lumbar radiculopathy, surgery trauma, restless legs syndrome, if this coud confound the assessment or self-evaluation of the neuropathic pain. Presence of other severe pain that could confound the assessment or self-evaluation of the neuropathic pain. History of malignancy within the past 5 years (with the exception of basal cell carcinoma). Subjects with PHN Active herpes zoster lesion or dermatitis of any origin at the affected site with PHN. Subjects who had neurological ablation by block or neurosurgical intervention for control of pain in PHN. Subjects with DPN No palpable pulse of the arteria dorsalis pedis in both feet. Clinical signs for venous insufficiency and/or postthrombotic syndrome Sage III/IV (i.e. extensive varicoses) Ulcers on the lower extremities.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br> | Drug: Topical analgesic<br>* max. 3 plasters per day for PHN patients max. 4 plasters per day for DPN patients<br>|
| Active Comparator: 2<br> | Drug: oral intake<br>* 300 to 600 mg per day taken orally<br>|
| Experimental: 3<br> | Drug: Topical analgesic<br>* 3 plasters for PHN patients per day 4 plasters for DPN patients per day<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction of pain expressed by response rate after 4 weeks treatment every 4 weeks of single or combination treatment: change in neuropathic pain, change in quality of life, change in sleep quality |  | 4 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Topical analgesic, Multiple dose