Varez 50^TM is categorized as a Class I anabolic steroid. Pharmacologically, it has been found that oxandrolone binds weakly to the androgen receptor. This seems inconsistent with the Class I / Class II system, but it is what has been found.

From the practical standpoint, however, oxandrolone's stacking behavior requires that it be classified as a Class I steroid: it combines synergistically with those categorized as Class II, but only additively with Class I compounds. From the practical standpoint, it is a rather potent drug - that is to say, it has good effectiveness per milligram. Oxandrolone does not aromatize or convert to DHT, and has an 8 hour half-life. Thus, a moderate dose taken in the morning is largely out of the system by night, yet supplies reasonable levels of androgen during the day and early evening.