side effect

Noun	1.	side effect - a secondary and usually adverse effect of a drug or therapy; "severe headaches are one of the side effects of the drug"
	2.	side effect - any adverse and unwanted secondary effect; "a strategy to contain the fallout from the accounting scandal" Synonyms: fallout

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