speedy effect; quick results; immediate action
Often used for medicines, treatments, or measures that take effect quickly. Contrasts with 遅効 (delayed effect).
See also: 遅効
This medicine has a speedy effect, so the pain will subside quickly.
Using a quick-acting fertilizer will quickly revive the plants.
quick-acting fertilizer
Compound of 速 (fast) and 効 (effect). The reading そっこう results from the assimilation of そく + こう.