コスト効率[kosutokouritsu] cost effectiveness
圧電効果[atsudenkouka] piezoelectric effect
偉効[ikou] great effect
逆効果[gyakukouka] backfire
経済効果[keizaikouka] (positive) economic effect

効果[kouka] effect
効果音[koukaon] sound effect
効果的[koukateki] effective
効果覿面[koukatekimen] bring an immediate result on

胃薬[igusuri] stomach medicine
医薬[iyaku] medicine
医薬品[iyakuhin] medical supplies
医薬分業[iyakubungyou] separation of medical and dispensary practice (practise)
飲薬[nomigusuri] oral medicine

下し薬[kudashigusuri] laxative
下ろし薬[oroshigusuri] an abortive
下薬[geyaku] laxative
加薬[kayaku] spices
火薬[kayaku] gunpowder