side effect

side effect
    n 1: a secondary and usually adverse effect of a drug or
         therapy; "severe headaches are one of the side effects of
         the drug"
    2: any adverse and unwanted secondary effect; "a strategy to
       contain the fallout from the accounting scandal" [syn: {side
       effect}, {fallout}]
    

55 Moby Thesaurus words for "side effect":
      accession, accessory, accompaniment, addenda, addendum, additament,
      addition, additive, additory, additum, adjunct, adjuvant,
      afterbirth, afterclap, aftercrop, aftereffect, afterglow,
      aftergrowth, afterimage, aftermath, afterpain, aftertaste, annex,
      annexation, appanage, appendage, appendant, appurtenance,
      appurtenant, attachment, augment, augmentation, by-product, coda,
      complement, concomitant, continuation, corollary, effect,
      extension, extrapolation, fixture, increase, increment, offshoot,
      pendant, placenta, reaction, reinforcement, response, secundines,
      side issue, supplement, tailpiece, undergirding