It is important to note that the steroids do not treat the underlying viral infection, which caused the croup. By decreasing the swelling in the airway, steroids help to prevent increasing breathing difficulty and decrease the discomfort of breathing for the child. Unfortunately, there is no known medication to successfully treat viruses causing croup, as they are basically the same viruses as those causing the common cold in adults. Therefore, your child will continue to have a cough and other viral symptoms (runny nose, mild temperature) for the next week or longer, despite having treatment for croup.
Although I am usually not inclined to posit speculations on why a particular drug does or doesn't do something, in this case I will. Im guessing that the higher doses of Anadrol cause enough appetite suppression (at least anecdotally) to make eating rather difficult. It can also increase insulin resistance and glucose intolerance (5). This has the effect of making macronutrient absorption more inefficient, and could also be a factor in reducing gains when the dosage goes over 100mgs/day. Unfortunately, Anadrol also has a reasonably profound effect on your body's natural hormonal system, on par with most other oral steroids , but not as bad as most injectables, and its certainly not as harsh on your lipid profile as many anabolics are