"Baruch atah Hashem -- Blessed are you Hashem -- rofei cholei amo Yisrael -- Healer of His people Israel,"
You Hashem are the one who keeps us well. You are healing us. Not merely when we're not sick; You're healing us constantly.. Of course when it's necessary to take medicine, we should take it. But you have to know that Hashem is the one who heals us. Your mitzvah is to take the medicine. But work on that emunah (faith) that only Hashem is the rofei cholei amo Yisrael. -- Seven Objectives of Tefila (#864)