Juntaro did pharmacological research on the important medicine remijin hydrochloride (a pneumonia drug derived from quinine), which at the time was imported from abroad, and on digitalis preparation and ephedrine.
当時外国から輸入されていた貴重薬物塩酸レミジン（キニーネ誘導体の肺炎治療薬）ジキタリス製剤及びエフェドリンについて薬理学的研究を行う。