Cyclotriazadisulfonamide (CADA) hydrochloride is a specific CD4-targeted HIV entry inhibitor with activity against HIV-1 replication. Cyclotriazadisulfonamide hydrochloride can specifically downregulate the expression of CD4 receptors on the cell surface, effectively inhibiting HIV transmission. Cyclotriazadisulfonamide hydrochloride can inhibit HIV-1(NL4.3) and SIV(mac251), and has a synergistic effect when used in combination with cellulose acetate (CAP). Cyclotriazadisulfonamide hydrochloride can also be used as a microbial gel formulation to maintain CD4 downregulation and antiviral activity, and is a broad-spectrum anti-HIV agent.