side-effect

Collateral medication outcome

A side-effect is a secondary consequence of something, usually unintended.

In medicine, side-effects are the unwanted results of a drug beyond its therapeutic purpose: Drowsiness is a common side-effect of antihistamines.

In programming, a side-effect is any state change a function causes beyond returning a value.

The term implies something incidental to the main purpose, though side-effects can sometimes be more significant than intended effects.

consequence

outcome

Final result of events

repercussion · fallout · ripple · knock-on · spillover · byproduct · offshoot · corollary · downstream · cascade

medical

adverse

Harmful or opposed

dizziness · headache · fatigue · insomnia · rash · interaction · contraindication · dosage · tolerance · withdrawal

unintended

unforeseen

Not predicted or expected

collateral · unanticipated · inadvertent · unplanned · unwitting · serendipitous · secondary · ancillary · concomitant · latent

bodily

nausea

Pre-vomiting stomach discomfort

fatigue · insomnia · rash · itching · swelling · inflammation · irritation · flushing · hives · anaphylaxis

negative

harmful

Causing damage or injury

undesirable · unwanted · problematic · troublesome · worrisome · dangerous · hazardous · toxic · debilitating · disruptive

Opposites
intentionality

side-effectgoal

Desired end result

objective · aim

centrality of purpose

side-effectdirect effect

Result without intermediary

desired effect · therapeutic effect · focal point

desirability (medical context)

side-effectremedy

Curative treatment or fix

therapeutic effect · cure

Family

side, effect, effective, sideline, sideboard, efficacy, side-effects

Familiarity
Top 200,000
Profile
Known to kids · Used worldwide · Timeless · Negative · Everyday, not technical · Rated G