The<unk> , or<unk>  phenomenon, is the emergence or re-emergence of symptoms that were either absent or controlled while taking a medication, but appear when that same medication is discontinued, or reduced in dosage. In the case of re-emergence, the severity of the symptoms is often worse than pretreatment levels.
Rebound effect
Weekend effect
Latent inhibition
Late effect
Abscopal effect
Bowditch effect
Concept creep
Windkessel effect