Medicine and G-d

 Chaya Adam (65:1) A person about to be bled for medicinal reasons should first say “It should  be G-d’s will that this activity should bring about a cure for me because  You are a free Doctor.”  Similarly prior to eating or drinking anything for medicinal purpose he should say this prayer and not think that something is curative without G-d’s involvement. Therefore by means of this prayer he puts his trust in G-d and asks from Him that this should cure him. After the procedure he should say  "Blessed art Thou King of the World who cures the sick."