SDZ WAG 994 is primarily used in research settings for its immunosuppressive properties. It functions by modulating T-cell activity, making it a valuable tool in studying immune system responses and transplant rejection mechanisms. Its application extends to experimental models investigating autoimmune diseases, where controlling immune activation is critical. Due to its specific mechanism of action, it is also employed in pharmacological studies aimed at developing new therapies with reduced side effects compared to broad-spectrum immunosuppressants.