I think you're naive if you imagine that medicine is innocent of these problems. Medical companies have huge incentives - literally worth billions - to make their results "come in right".
The number of medical researchers who sell their hot prospect to a corporation that is unable to replicate the initial exciting results, is clearly more than the statistics of small sample sizes vs. large would indicate. This suggests that this problem exists anywhere that the incentives are in favor of it.
>allopathic medicine: a system of medical practice that emphasizes diagnosing and treating disease and the use of conventional, evidence-based therapeutic measures (such as drugs or surgery) [1]
>osteopathic medicine: a system of medical practice that emphasizes a holistic and comprehensive approach to patient care and utilizes the manipulation of musculoskeletal tissues along with other therapeutic measures (such as the use of drugs or surgery) to prevent and treat disease [2]
>homeopathic medicine: a system of alternative medicine that treats a disease especially by the administration of minute doses of a remedy that would in larger amounts produce symptoms in healthy persons similar to those of the disease [3]
>medicine: the science and art dealing with the maintenance of health and the prevention, alleviation, or cure of disease [4]
Homeopathy is still a form of medicine, though it is not allopathic medicine. That said, the lines are quite blurred. I know that at least one type of leukemia is treated with a cocktail of arsenic and vitamin A. That treatment is given in a standard hospital setting. By the definitions above, such a treatment is actually homeopathic medicine, not allopathic. Yet, the treatment does indeed work.