Testosterone Propionate 30mg
Testosterone Phenylpropionate 60mg
Testosterone Isocaproate 60mg
Testosterone Decanoate 100mg
Testosterone Cypionate 100mg
Manufacturer: British Dragon Pharmeceuticals
Pack: 10 ampoules (350 mg/ml)
This is a testosterone injection consisting of a mix of propionate, phenylpropionate, isocaproate, and decanoate esters. Because of the mix of different esters, "4 Test Inj" has improved pharmacokinetics with the fast action of propionates and the prolonged action of longer isocaproate and decanoate esters, thus providing a more stable concentration of testosterone in the blood over a longer period of time.
Esterification of the 17-beta-hydroxy group by different esters can prolong of action of testosterone, because testosterone esters are less polar than free testosterone. Testosterone esters in oil injected intramuscularly are absorbed slowly from the lipid phase; thus "4 Test Inj" can be given at intervals of two to four weeks.
Dosage and administration:
Adult dose (male): 200-400 mg per every 2 weeks intramuscularly
Adult dose (female in case of mammary cancer): 200 to 400 mg every 2 to 4 weeks intramuscularly.
During exogenous administration of androgens, endogenous testosterone release is inhibited through feedback inhibition of pituitary luteinizing hormone (LH). In males: at large doses of exogenous androgens, spermatogenesis may be suppressed through feedback inhibition of pituitary follicle stimulating hormone (FSH). In females: virilization effects.