immunosuppressive drug

NOUN
22 LETTERS · STARTS WITH I

immunosuppressive drug is a valid 22-letter word worth 34 points in Scrabble and 44 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1M3M3U1N1O1S1U1P3P3R1E1S1S1I1V4E1D2R1U1G2
1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 0 + 2 + 1 + 1 + 2 =34 PTS
DOUBLE WORD → 68TRIPLE WORD → 102
MEANING

What does immunosuppressive drug mean?