Background: The global burden of chronic pain and inflammatory disorders necessitates the exploration of novel, accessible, and safe therapeutic agents from underexplored natural sources. Insects, despite their diversity, remain a neglected frontier in pharmacognosy. Tribolium castaneum (red flour beetle), a ubiquitous stored-grain pest and established genetic model organism, produces defensive benzoquinones and cuticular hydrocarbons with potential but uncharacterized pharmacological activity.

Objective: This study provides a comprehensive experimental protocol to evaluate the analgesic and anti-inflammatory activities of dried T. castaneum powder in validated rodent models, alongside phytochemical characterization and toxicity profiling.

Methods: Adult beetles will be reared under controlled conditions, processed into dried powder, and subjected to sequential solvent extraction. Acute oral toxicity will follow OECD Guideline 423. Analgesic activity will be assessed using acetic acid-induced writhing, hot plate, tail immersion, and formalin-induced paw licking tests in Swiss albino mice. Anti-inflammatory activity will be evaluated using carrageenan- and formalin-induced paw edema models in Wistar rats. Mechanistic insights will be derived from quantifying pro-inflammatory cytokines (TNF-α, IL-1β, IL-6), PGE₂, COX-2, nitric oxide, myeloperoxidase, and oxidative stress markers (MDA, GSH, SOD, CAT) in serum and paw tissue, complemented by histopathological examination.

Expected Outcomes: We anticipate dose-dependent (100-400 mg/kg) analgesic and anti-inflammatory activities, with peak efficacy at 400 mg/kg comparable to standard drugs (aspirin 100 mg/kg, indomethacin 10 mg/kg). The formalin test is expected to show preferential inhibition of the late (inflammatory) phase, suggesting a peripheral mechanism of action via COX-2/NF-κB pathway suppression and reduction of oxidative stress. Acute toxicity is expected to yield an LD₅₀ > 2000 mg/kg, indicating a favourable safety profile.