This is the 778th most frequent Japanese word.
効果
Effect; effectiveness; result.
効果 refers to the effect or efficacy, specifically highlighting the result produced by the medicine.
この薬は速やかに効果を発揮します。
This medicine swiftly takes effect.
効果 is used to describe the influence or result brought about by someone's action, in this case his persuasion.
彼の説得の効果で、私は考えを変えました。
Due to the effect of his persuasion, I changed my mind.
効果 emphasizes the impact or outcome achieved, focusing on the positive results of the new technology.