1. A delayed effect of a drug or therapy.
2. Any result that follows its cause after an interval. after-effect, after effect
3. An effect felt after an event; a delayed effect.

ETYM Latin sequela, from sequit to follow: cf. French séquelle a following. Related to Sue to follow.
1. A part added to a book or play that continues and extends it; SYN. continuation.
2. Something that follows something else; SYN. subsequence.

ETYM Latin, a follower, a result, from sequit to follow.
After-effect of any trauma; consequence or result
Any abnormality following or resulting from a disease or injury or treatment.
Medicine, consequential effect of a disease, condition, etc., complication.