συνθεραπεύω
From LSJ
ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → life is not worth living if you do not have at least one friend
English (LSJ)
A treat medically as well, καὶ τὴν κεφαλήν Steph.in Gal. 1.338 D.:—Pass., ταῦτα -εται τῷ παντὶ σώματι Herod.Med. ap. Aët. 5.129. 2 pay court to one along with or together, Philostr.VA6.30 (Pass.).