after-effect
n effect that occurs afterwards, eg a delayed effect of a drug used medically 後效(如用药後延迟的效应); effect that occurs after its cause has gone 後遗效应; 副作用
suffer from/feel no unpleasant after-effects 感到[未感到]有不良的副作用.
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.