take effect(redirected from taking effect)
To begin to impact someone or something. How long until these pills take effect? My back is killing me! This piece of legislation takes effect next week.
1 have the intended result: It will be some time before the painkillers take effect.
2 (formal) start to be valid: Your promotion takes effect from the end of the month.
1. To become operative, as under law or regulation: The curfew takes effect at midnight.
2. To produce the desired reaction: The antibiotics at last began to take effect.