A public interest corporation has found that ecbolic drugs were used improperly in 77 percent of 56 cases to promote speedy child delivery since 2009.

The 56 cases involved obstetric accident compensation. The 43 improper ecbolic treatments included one alleged to have caused cerebral palsy in the baby and six suspected of contributing to the condition, the Japan Council for Quality Health Care said.

These ecbolic treatments are among 188 obstetric treatments subject to compensation under a system to provide compensation regardless of doctors' negligence for cases in which obstetric accidents cause cerebral palsy.

The 43 improper treatments deviated from the guidelines established by the Japan Society of Obstetrics and Gynecology. While one guideline calls for sufficient explanations on and pregnant patients' consent to ecbolic treatments, only 28 of the 56 cases did so. In eight such treatments, no explanation or consent was given.