Post-anesthetic medications such as opioids, proethazine, ondansetron, promethazine, droperidol, bethanechol. Why would bethanechol be used post surgery?

Bethanechol is a powerful pain reliever

Bethanechol is a powerful antiemetic

Bethanechol is used for abdominal distention and urinary retention

Bethanechol is used for mild pain