(-)-RITODRINE

摘要

(-)-Ritodrine, that is (-)-erythro-1-(p-hydroxyphenyl)-2-¢2-(p-hydroxyphenyl)ethylamino)-1-propanol or a salt thereof substantially free from the (+)-isomer is disclosed. The compound has a strong suppressive effect on uterine contraction in comparison with (~)-ritodrine and (+)-ritodrine and has the same level of toxicity as these compounds, so that it can be used as a therapeutic agent of threatened premature birth and threatened abortion as well as a therapeutic agent of dysmenorrhea having a high safety.