Rationalized approach for the treatment of neuropathic pain

Injury to the nerves causes alteration in normal neurobiological sequences lead to disease of somatosensory nervous system called as neuropathic pain (NP). It affects both central as well as peripheral nervous system. It is a chronic painful condition occurs due to various diseases like HIV, diabetes, lesions, infection, trauma, and metabolic insults. NP affects 7–10% of global population, hence subsequently is a major concern. Pharmacotherapy for NP remains a major clinical challenge due to its complex pathophysiology. Current treatments like Analgesics, anticonvulsants, non-steroidal anti-inflammatory drugs, tri-cyclic antidepressants, sodium channel blocker and opioid agonist administrated individually to patients of NP are providing only meager and partial relief. Furthermore, these drugs have limited efficacy as well as adverse effects. Hence instead of monotherapy, pathophysiology of NP suggests that administering multiple drugs (polypharmacy) show quick and sufficient effect in the treatment of NP. Recent updates indicate that combination of Morphine and gabapentin, Pregabalin and duloxetine, Gabapentin and nortriptyline, Amitriptyline and ketamine (topical), Doxepin and capsaicin (topical), Glyceryl trinitrate (topical) and valproate are also a good choice for the treatment of NP. Several clinical trials also established that combination pharmacotherapy showed greater efficacy than monotherapy in treating NP. Physicians, scientists working in the area of NP are not only looking for its treatment but also in resolving the issues of co-morbidities associated with it. Hence the present review focuses on rationalized approach of combination therapy for the treatment of various aspects of NP.