WordNet (r) 3.0 (2006):

doped
    adj 1: treated or impregnated with a foreign substance
    2: under the influence of narcotics; "knocked out by doped
       wine"; "a drugged sleep"; "were under the effect of the
       drugged sweets"; "in a stuperous narcotized state" [syn:
       doped, drugged, narcotized, narcotised]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "doped":
   anesthetized, asleep, cataleptic, catatonic, cold, comatose, dead,
   dozy, dreamy, drowsy, drugged, drugged with sleep, half asleep,
   half-conscious, heavy, heavy with sleep, heavy-eyed, high,
   hopped-up, in a stupor, languid, lethargic, napping, narcoleptic,
   narcose, narcotized, narcous, nirvanic, nodding, oblivious,
   oscitant, out, out cold, out of it, sedated, semiconscious,
   senseless, sleep-drowned, sleep-drunk, sleep-filled, sleep-swollen,
   sleepful, sleepy, slumberous, slumbery, snoozy, somnolent,
   soporific, spaced out, spaced-out, stoned, stretchy, strung out,
   stuporose, stuporous, unconscious, wiped out, yawning, yawny,
   zonked, zonked out