薬(くすり) kusuriは waすぐ sugu効(き)い()た() kiita。 The medicine worked right away. Literal Medicine [topic-は] immediately took-effect. Short, plain-past, concrete. すぐ ('immediately') is the adverb, 効いた is the plain past of 効く. One of the cleanest possible examples of the medical 効く. healthmedicine
薬(くすり) kusuriは waすぐ sugu効(き)い()た() kiita。 The medicine worked right away. Literal Medicine [topic-は] immediately took-effect. Short, plain-past, concrete. すぐ ('immediately') is the adverb, 効いた is the plain past of 効く. One of the cleanest possible examples of the medical 効く. healthmedicine