Organon §37

Moderate allopathic treatments do not alter or cure stronger chronic diseases, even if the treatments go on for years. 

So also, under ordinary medical treatment, an old chronic malady remains uncured and as it was when it is gently treated allopathically (according to the common treatment mode) that is, when it is treated with medicines incapable of engendering in healthy individuals a condition-state similar to the disease. An old chronic malady does not respond to gentle allopathic treatment even when the treatment lasts for years. 78 Since this is seen daily in practice, it requires no confirming examples. 

Comment

78 If, on the other hand, the old chronic malady is treated for years with violent allopathic means, then maladies of another kind, that are still more wearisome and life-threatening, will be formed in its place.