“One who cares for the sick is fit to do so if he has 5 qualities.

What 5?

He can prepare medicine,he knows what is healing and administers it BUT never administer what is harmful,he cares for the patient out of love NOT out of desire for gain, he is unmoved by excrement, urine, vomit and spittle, and from time to time he can instruct, uplift, gladden and encourage the patient with talk on the Truth.”

The Buddha in Anguttara Nikaya

HT: Punna