The Collaborative International Dictionary of English v.0.48:

Overdose \O`ver*dose"\, v. t.
   To dose to excess; to give an overdose, or too many doses,
   to.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Overdose \O"ver*dose`\, n.
   Too great a dose; an excessive dose.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overdose
    v 1: dose too heavily; "The rock star overdosed and was found
         dead in his hotel room" [syn: overdose, o.d.]

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "overdose":
   OD, allay, avalanche, bag, bang, be brought down, be felled,
   be prodigal with, be struck down, be traumatized, booster,
   booster dose, booster shot, break out, catch, catch cold, cloy,
   cloyer, collapse, come down with, contract, cram, deck, deluge,
   dose, draft, dropping, drug packet, embarras de richesses, engorge,
   engulf, enough, erupt, extravagance, extravagancy, fever, fill,
   fill up, fix, flood, flood the market, get, glut, go into shock,
   gorge, hit, injection, inundate, inundation, jade, landslide,
   lavishness, mainlining, money to burn, more than enough,
   narcotic shot, overabundance, overaccumulation, overbounteousness,
   overcopiousness, overequip, overfeed, overfill, overfurnish,
   overgorge, overlavish, overlavishness, overluxuriance, overmeasure,
   overmuchness, overnumerousness, overplentifulness, overplenty,
   overpopulation, overprofusion, overprovender, overprovide,
   overprovision, oversaturate, oversell, overstock, overstuff,
   oversufficiency, oversupply, overwhelm, pall, plenty, plethora,
   popping, portion, potion, prodigality, redundancy,
   run a temperature, sate, satiate, satisfy, saturate, shot, sicken,
   sickener, skin-popping, slake, spate, stuff, superabundance,
   superflux, supersaturate, surfeit, surfeiter, swamp, take,
   take ill, warmed-over cabbage, whelm