Oxymetholone does not bind well to the androgen receptor, and most of the anabolism it provides is via non-androgenic receptor-mediated effects. It is therefore best stacked with an anabolic steroid like Deca Durabolin or Primobolan . The drug appears to give the same benefits as Dianabol. Unlike Dianabol, however, it seems that Oxymetholone is progestagenic. It has been observed to cause nipple soreness or to aggravate gynecomastia even in the presence of high dose antiestrogens, strongly suggesting that the effect is not estrogenic. That effect can be reduced by concurrent use of Stanozolol ( Winstrol ), which is anti-progestagenic. This progestagenic effect of oxymetholone is only a concern when using aromatizing steroids. With androgens such as Primobolan, Oxymetholone stacks very nicely and is a surprisingly friendly drug. In contrast, with testosterone it is a very harsh drug.