Design and Pharmaceutical Evaluation of

Background: Plant-based pain-relieving formulations have garnered attention in drug discovery, particularly those with a traditional background, often considered essential remedies for communities that rely on plant-based therapies for pain relief. Objectives: This study aimed to develop and evaluate a semisolid nanoemulsion using Methods: A topical nanoemulsion was prepared under standard conditions using black pepper essential oil, emulsifiers, and excipients. Various combinations of Span 80 and Tween 80 were screened to achieve the desired hydrophilic-lipophilic balance (HLB) value. Among the several formulations prepared, a nanoemulsion sample was selected for detailed analytical and pharmaceutical evaluations. Gas chromatography with flame ionization detection (GC/FID) was used to identify and quantify major chemical constituents of the essential oil and the formulated nanoemulsion. Results: An optimized combination of Span 80 and Tween 80, with an HLB of 11, contributed significantly to the physical stability of the formulations. A concentration of 2.7% Conclusions: The formulated black pepper nanoemulsion successfully passed key pharmaceutical quality tests, indicating its potential as a natural topical pain-relieving agent. Further in vivo studies and subsequent clinical trials may lead to the development of a plant-based product for managing neuropathic pain.