Betamethasone is a potent corticosteroid that exerts anti-inflammatory, immunosuppressive, and antiproliferative effects by binding to glucocorticoid receptors, modulating gene transcription to suppress pro-inflammatory cytokines and immune cell activation. Calcipotriol, a synthetic vitamin D3 analogue, regulates keratinocyte proliferation and differentiation by binding to vitamin D receptors, normalizing epidermal cell growth and reducing psoriatic plaque formation. The combination offers synergistic effects, balancing inflammation suppression with normalization of skin cell turnover.