What is Primobolan?

Here are some fast facts before I describe it in normal people terms.

  (Oral Version is + Acetate Ester) 
    (Injectable Version is +

 Enanthate Ester) 
    [17beta-Hydroxy-1-methyl-5alpha-androst-1-en-3-one] 
    Molecular weight of base: 302.4558 
    Molecular weight of Acetate ester: 60.0524 
    Molecular weight of Enanthate ester: 130.1864 
    Formula: C20H30O2 
    Melting Point: 
    Manufacturer: Schering 
    Effective dose(oral): (Men)50-100mgs/day; (Women) 10-25mgs/day 
    Effective dose (injectable): (Men) 350-600mgs/week; (Women) 100mgs/week 
    Active Life: 10-14 days (injectable); 4-6hrs (oral) 
    Detection Time: 4-5 weeks 
    Anabolic/Androgenic Ratio (Range): 88:44-57

Primobolan is a type of anabolic steroid, yes there are several types, that Alex Rodriguez tested positive for. This is one of the two types he was positive for. When used by itself Primobolan is slightly weak compared to other types of the drug. Most likely Rodriguez paired it up with some testosterone to gain as much lean muscle as possible.