According to the Charaka tradition, there existed six schools of medicine, founded by the disciples of the sage Punarvasu treya
चरक परंपरेप्रमाणे, पुनर्वसु अत्रेय या ऋषींच्या शिष्यांनी औषधीशास्त्राच्या सहा शाखा निर्माण केल्या.