aftereffect

aftereffect
    n 1: any result that follows its cause after an interval
    2: a delayed effect of a drug or therapy; "the drug had
       unexpected aftereffects"
    

26 Moby Thesaurus words for "aftereffect":
      afterbirth, afterclap, aftercrop, afterglow, aftergrowth,
      afterimage, aftermath, afterpain, aftertaste, by-product,
      consequence, event, eventuality, issue, outcome, placenta,
      remainder, residual, residuum, result, secundines, side effect,
      track, trail, upshot, wake