The present invention relates to a cough depressant composition containing iron for angiotensin-converting enzyme inhibitor inducing cough. The cough depressant composition of the present invention comprises 0.01-100% by weight of Fe.sup.2+(ferrous) or Fe.sup.3+(ferric). Furthermore, the cough depressant composition of the present invention can comprise an angiotensin-converting enzyme inhibitor. The cough depressant composition of the present invention relieves the pain of the patient by reducing continuous dry cough.