Commentary for Avodah Zarah 53:19
אמר רב חסדא אמר מר עוקבא אבל אם אמר לו סם פלוני יפה לו סם פלוני רע לו מותר
R. Hisda said in the name of Mar Ukba: But if he said to him that such and such medicine is good for him and such and such medicine is bad for him, it is permitted [to follow his advice]
Daf Shevui to Avodah Zarah
One may get advice from a non-Jewish doctor as to what medicine he should take. He does not need to worry that the non-Jew will tell him to take something poisonous, because the non-Jewish doctor would fear that the Jew will go ask a second opinion and when he hears what the non-Jewish doctor recommended his reputation will be spoiled.
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