This is copied & pasted from steroid.com:
From personal experience, however, I can tell you that gains from Anadrol are quite dramatic for the first 3 weeks, and then quickly level off. Unfortunately, I find that the side effects experienced from Anadrol (which include a headache, bloating, elevated blood pressure, and a general "unwell" feeling for me) remain for the entire duration of use& .but I find, as usual, side effects for this drug are pretty much half legend and half truth. Since Anadrol is derived from DHT, it can´t actually convert to estrogen (via the aromatase enzyme), and it´s not a progestin or a compound with progestenic activity& so the estrogenic (?) side effects produced by it are of a very mysterious nature. It has been speculated that perhaps it can stimulate the estrogen receptor without actually being converted to estrogen& that´s about as plausible an explanation as I´ve heard& However, things really get strange, when Oxymetholone has been used in studies to alter the female reproductive/menstrual cycle; in those cases, it has lowered plasma progesterone levels! (7)One would expect that an AI (aromatase inhibitor) wouldn´t be of much use with this drug, but many have found that Letrozole (which has, in some cases been shown to reduce estrogen in the body to an undetectable amount)(6) can greatly reduce or even eliminate many of the more noticeable side effects of Anadrol, such as the bloating.