Charak Samhita
यमुद्दिश्यातुरं वैद्यः संवर्तयितुमौषधम् । यतमानो न शक्नोति दुर्लभं तस्य जीवितम् ॥६॥
If a physician is keenly providing medicine or therapy to a patient but not getting result for the same, the patient survives hardly.
english translation
yamuddizyAturaM vaidyaH saMvartayitumauSadham । yatamAno na zaknoti durlabhaM tasya jIvitam ॥6॥
hk transliteration by Sanscript