All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is not permissible to say that what Ibn Al-Qayyim wrote in "The Prophetic Medicine" is based on the Greek Medicine; rather, it is founded on what is mentioned in the guidance of the Prophet in the matter of treatment. The narrations of the Prophet which are reported about medical treatment are general, like the narration which reads: "O Slaves of Allaah! Seek treatment. Indeed Allaah has not sent down an illness without sending down a cure for it." [Abu Daawood]
There is no doubt that some texts about details of some medicines were reported but they are few, but the principle of medicine is based on experiments. Therefore, if it is confirmed that there is a cure with a particular medicine, then seeking treatment with it becomes permissible even if no evidence is reported in its regard, because in principle all things are permissible [unless the contrary is proven]. Therefore, it is correct to say that this book is about the Prophetic Medicine and it is possible to benefit from it and consider it as a resource book in its field.
As regards what Ibn Al-Qayyim mentioned about the Greek Medicine or else, he mentioned this as a way of explaining and detailing some matters, and he did not attribute this to the Prophet .
Allaah Knows best.