Beyond analgesia: A comprehensive opinion review on the dual-action strategy of celecoxib and duloxetine in knee osteoarthritis

Table 1 Synergistic vs antagonistic dynamics of celecoxib-duloxetine combination

Dimension	Synergy (the “pros”)	Antagonism (the “cons”)	Clinical resolution
Pain control	Targets both peripheral and central sensitization pathways	Potential “masking” of significant structural worsening	Regular radiographic and physical assessment
Psychosocial	Breaks the pain-anxiety cycle; increases self-efficacy	Risk of “activation syndrome” and cognitive clouding	Baseline psychiatric screening (HADS/PHQ-9)
Gastrointestinal	Celecoxib is COX-1 sparing	Duloxetine reduces platelet serotonin, increasing bleeding time	Avoids triple therapy with aspirin; consider PPIs
Geriatric safety	Improved mobility due to analgesia	Dual-pressor effect on BP; syndrome of inappropriate antidiuretic hormone/hyponatremia; falls	Bi-weekly BP and electrolyte monitoring in the first month

COX-1: Cyclooxygenase 1; BP: Blood pressure; HADS: Hospital Anxiety and Depression Scale; PHQ-9: Patient Health Questionnaire-9; PPIs: Proton pump inhibitors.