Andropen 275 is a five-ester blend of testosterone produced by British Dragon. Andropen contains 20mgs of Testosterone Acetate, 75mgs of Testosterone Cypionate, 90mgs of Testosterone Decanoate, and 40mgs each of Testosterone Propionate and Phenylpropionate in a 20ml bottle.

Testosterone is a relatively cheap drug. It induces changes in both the shape as well as size as muscle fibers (1). It can change the appearance and the number of muscle fibers (1). Testosterone has the profound ability to protect your muscle from catabolic (muscle wasting) glucocorticoid hormones (2), although not as well as (for example) Tren or other such (more expensive) drugs. Glucocorticoid hormones send a message to muscle cells to release stored protein, while Testosterone sends a message to muscle cells to store more contractile protein (called actin and myosin). In this way, these two hormones are at war with each other to cause anabolic vs. catabolic effects. When you add in some Testosterone (such as Andropen 275), you shift the scales in favor of anabolism, and away from catabolism. In addition to this, Testosterone has the ability to increase erythropoiesis (red blood cell production) in your kidneys (3), and a higher Red Blood Cell (RBC) count is highly sought after by many athletes because it may improve endurance via better oxygenated blood. More RBCs can also improve recovery from strenuous physical activity, and seems to give the muscles a more "full" look when bodyfat levels are reasonably low. Agression levels often rise dramatically with the use of exogenous testosterone (9), and due to some of the short esters in Andropen 275.

Testosterone + 5 esters
     [4-androstene-3-one, 17beta-ol]
     Molecular Weight of base: 288.429
     Molecular Weight of Acetate ester: 60.0524
     Molecular Weight of Propionate ester: 74.0792
     Molecular Weight of Phenylpropionate ester: 150.174
     Molecular Weight of Cypionate ester: 132.1184
     Molecular Weight of Decanoate ester: 172.2668
     Formula (base): C19 H28 O2
     Formula of Acetate ester: C2 H4 O2
     Formula of Propionate ester: C3H6O2
     Formula of Phenylpropionate ester:C9 H10 O2
     Formula of Cypionate ester: C8 H14 O2
     Formula of Decanoate ester: C10 H20 O2
     Manufacturer: British Dragon
     Effective dose (injectable): (Men) 550mgs-1,100mgs+/week
     Active Life: 14 days
     Detection Time: 3 months (projected)
     Anabolic/Androgenic Ratio (Range):100:100

Source: steroid.com