im•mu•no•sup•pres•sive  (im′yə nō sə pres′iv, i myo̅o̅′-),USA pronunciation [Pharm.]
adj. 

1. Drugscapable of causing immunosuppression:immunosuppressive drugs.

n. 

2. Drugs[Pharm.]

Also, im•mu•no•sup•pres•sor (im′yə nō sə pres′ər, i myo̅o̅′-).USA pronunciation any substance that results in or effects immunosuppression.