It is not permissible for a doctor to break the fast in order to treat patients, unless the patient is in a serious condition and his treatment depends on the attending doctor breaking the fast. In that case it is permissible for the doctor to break the fast, because he is saving someone from dying.
And Allah is the source of strength. May Allah sent blessings and peace upon our Prophet Muhammad and his family and companions. End quote.
Shaykh Abd al-Azeez ibn Baaz, Shaykh Saalih al-Fawzaan, Shaykh Abd al-Azeez Aal ash-Shaykh,Shaykh Bakr Abu Zayd
Reproduced from Islam QA