Anadrol for in: does not bind well to the androgen receptor (AR), and most of the anabolism it provides is via non-AR-mediated effects. It is therefore a Class II steroid and is best stacked with a Class I steroid. The drug appears to give the same benefits as Dianabol. Unlike Dianabol, however, it seems that anadrol 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, anadrol stacks very nicely and is a surprisingly friendly drug. In contrast, with testosterone it is a very harsh drug.
Oxymetholone does not convert to estrogen, and thus antiestrogens are not required if no aromatizable AAS are being used. However, in concert with aromatizing drugs, oxymetholone is notorious for worsening "estrogenic" symptoms, possibly by producing progestagenic symptoms which the bodybuilder confuses as estrogenic, or by altering estrogen metabolism, or by upregulating aromatase.
Compared to what bodybuilders expect of it, the drug is reasonably mild when no aromatizing steroids are present. I consider its potency approximately comparable to Dianabol. It is not unusual for a first time user to do quite well on an oxymetholone-only cycle, but more advanced users will want to stack with another steroid. Typical use is 50-150 mg/day, which should be divided into several doses per day.
Because oxymetholone is 17-alkylated, it is stressful to the liver. It is better to limit use to no more than 6 weeks or preferably four weeks before taking a break of at least equal length. Many users feel that it is more effectively used in the beginning parts of the cycle, rather than in the last few weeks.


Trivial name
Oxymetholone ( Anadrol )
Systematic name
5-alpha,17-beta-Androstan-3-one, 17-hydroxy-2-(hydroxymethylene)-17-methyl-
CAS number
434-07-1
ATC code
A14AA05
Merck Index Number
7036
Chemical formula
C21H32O3
Molecular weight
332.477 g/mol
Bioavailability
95%
Metabolism
Hepatic
Elimination half-life
9 hours
Excretion
Urinary: 95%
Pregnancy category
X
Legal status
Prescription only (US)
Controlled substance
Yes, DEA Schedule III (US)
Routes of administration
Oral