Population Pharmacokinetic-pharmacodynamic (PK-PD) Modeling of Co-administered Gabapentin in Neuropathic Pain

Phase 2

Completed

• Conditions: Post-traumatic Neuropathic Pain
• Interventions: Drug: gabapentin and donepezil; Drug: gabapentin and venlafaxine

• Registration Number: NCT00967707
• Lead Sponsor: Uppsala University

Brief Summary

The primary objective of this study is to develop a pharmacokinetic (PK) and a pharmacokinetic-pharmacodynamic (PK-PD) model for gabapentin in patients with neuropathic pain.

The secondary objectives are to investigate whether adjuvant therapy of venlafaxine or donepezil contributes to 1) improved analgesic efficacy and 2) improved health-related quality of life (assessed by the SF-36 questionnaire) in neuropathic pain patients treated with gabapentin.

Detailed Description

Neuropathic pain is estimated to affect 2-3 % of the population and the condition is difficult to treat with conventional analgesics. The drug of first choice is typically a tricyclic antidepressant drug (TCA) or the antiepileptic drug gabapentin. TCAs have well-documented effects, but the use is commonly interrupted due to intolerable adverse effects. Gabapentin, on the other hand, is generally well tolerated in patients. Clinical trials have proven that gabapentin is efficacious for neuropathic pain of various origins. Nevertheless, monotherapy is seldom sufficient for the management of severe neuropathic pain. Combination therapy, e.g. of gabapentin and an analgesic with complementary mechanism of action, may be a rational strategy to obtain improved results at lower doses and with fewer side effects. Although many neuropathic pain patients receive a combination of drugs, there is an absence of clinical evidence for optimal drug combinations.

Gabapentin binds to the alpha-2-delta subunit on presynaptic voltage-gated calcium channels, which results in modulation of the release of neurotransmitters from presynaptic nerve terminals. Recent studies in animal models of neuropathic pain have shown that gabapentin is effective on supraspinal structures, to activate the descending pain inhibitory noradrenergic-cholinergic cascade. Thus, it might be possible to potentiate the analgesic effect of gabapentin by concomitant administration of a drug able to prolong the action of noradrenaline or acetylcholine in the synapse cleft. In this study, the adjuvant effect of the noradrenaline and serotonin reuptake inhibitor venlafaxine and the cholinesterase inhibitor donepezil will be investigated in neuropathic pain patients treated with gabapentin.

The study consists of two periods. All patients are treated with gabapentin in the first period, and receive randomised adjuvant therapy of venlafaxine or donepezil in the second period. Repeated pain intensity ratings and blood samples for analysis of gabapentin plasma concentrations will be collected over one dosing interval of gabapentin at the end of each period.

Data will be analysed by means of nonlinear mixed effect modeling. The NONMEM programme will be used to develop models describing the PK and the PK-PD relationship of gabapentin in patients with neuropathic pain. The potential effect of concomitant treatment with venlafaxine or donepezil will be evaluated by covariate analysis in the developed PK and PK-PD models of gabapentin.

Study Timeline

• Study Start: 2009-08
• Study First Submitted: 2009-08-27
• Study First Submitted QC: 2009-08-27
• Study First Posted: 2009-08-28
• Primary Completion: 2011-04
• Status Verified: 2011-09
• Study Completion: 2011-09
• Last Update Submitted: 2011-10-11
• Last Update Posted: 2011-10-12

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Diagnosis of post-traumatic neuropathic pain
• Spontaneous pain intensity ≥ 40 on VAS or ≥ 4 on NRS
• Man or woman ≥ 18 years old
• Informed consent to study participation

Exclusion Criteria

• Presence of other type of pain as strong as or stronger than the neuropathic pain
• Impaired kidney function (GFR < 30 ml/min)
• Uncontrolled cardiovascular disease/hypertonia
• Uncontrolled narrow-angle glaucoma
• Uncontrolled pulmonary disease
• Epilepsia
• Pregnancy
• Nursing
• Woman of childbearing potential not using contraception or planning to become pregnant during the study period
• Disability to understand and cooperate with study procedures
• Allergy to study medications
• Concomitant participation in other clinical study

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Gabapentin + donepezil	gabapentin and donepezil	-
Gabapentin + venlafaxine	gabapentin and venlafaxine	-

Primary Outcome Measures

Name	Time	Method
Pain intensity scorings on Numerical Rating Scale (NRS). Plasma concentrations of gabapentin.	0 - 8 hours follwing dose intake of gabapentin. during steady state

Secondary Outcome Measures

Name	Time	Method
Health-related quality of life assessed by SF-36. Pain according to McGill Pain Questionnaire.	Minimum 6 weeks following initiation of gabapentin and combination therapy, respectively

Trial Locations

Locations (1)

Multidisciplinary Pain Centre, Uppsala University Hospital; 🇸🇪 Uppsala, Sweden