Testosterone Therapy – Cypionate Description

Testosterone Cypionate
Testosterone Cypionate Description


Testosterone Cypionate Injection, for intramuscular injection, contains Testosterone Cypionate which is the oil-soluble 17 (beta)- cyclopentylpropionate ester of the androgenic hormone testosterone.

It is a white or creamy white crystalline powder, odorless or nearly so and stable in air. It is insoluble in water, freely soluble in alcohol, chloroform, dioxane, ether, and soluble in vegetable oils.

The chemical name for Testosterone Cypionate is androst-4-en-3-one,17-(3-cyclopentyl-1- oxopropoxy)-, (17β)-. Its molecular formula is C27H40O3, and the molecular weight 412.61.

The structural formula is represented below:

Testosterone Cypionate Injection is available as 200 mg/mL Testosterone Cypionate.


Each mL of the 200 mg/mL solution contains:
Testosterone Cypionate200 mg
Benzyl benzoate0.2 mL
Cottonseed oil560 mg
Benzyl alcohol (as preservative)9.45 mg


Testosterone Cypionate – Clinical Pharmacology


Endogenous androgens are responsible for normal growth and development of the male sex organs and for maintenance of secondary sex characteristics. These effects include growth and maturation of the prostate, seminal vesicles, penis, and scrotum; development of male hair distribution, such as beard, pubic, chest, and axillary hair; laryngeal enlargement, vocal cord thickening, and alterations in body musculature and fat distribution. Drugs in this class also cause retention of nitrogen, sodium, potassium, and phosphorous, and lower urinary excretion of calcium. Androgens increase protein anabolism and decrease protein catabolism. Nitrogen balance is better only when there is sufficient intake of calories and protein.

Androgens are responsible for the growth spurt of adolescence and for eventual termination of linear growth, brought about by fusion of the epiphyseal growth centers. In children, exogenous androgens accelerate linear growth rates, but may cause disproportionate advancement in bone maturation. Use over long periods may result in fusion of the epiphyseal growth centers and termination of the growth process. Androgens stimulate production of red blood cells by enhancing production of erythropoietic stimulation factor.

Exogenous administration of androgens inhibits the release of endogenous testosterone by feedback inhibition of pituitary luteinizing hormone (LH). At high doses of exogenous androgens, feedback inhibition of pituitary follicle stimulating hormone (FSH) may also suppress spermatogenesis.

There is a lack of substantial evidence that androgens are effective in fractures, surgery, convalescence, and functional uterine bleeding.




Testosterone esters are less polar than free testosterone. When Specialists inject oil intramuscularly, testosterone esters absorb slowly from the lipid phase; thus, Specialists can give Testosterone Cypionate at intervals of two to four weeks.

Plasma testosterone levels are 98 percent when it binds to a specific testosterone-estradiol binding globulin, and about 2 percent remains unbound. The amount of sex-hormone binding globulin in the plasma generally determines the distribution of testosterone between its free and bound forms, and the concentration of free testosterone influences its half-life.

Testosterone excretes about 90 percent of its dose in the urine as glucuronic and sulfuric acid conjugates along with its metabolites. Approximately 6 percent of the dose is excreted in the feces, mostly in the unconjugated form. The liver primarily carries out the inactivation of testosterone. Testosterone undergoes metabolism into various 17-keto steroids through two different pathways. When injected intramuscularly, Testosterone Cypionate has a half-life of approximately eight days.

Many tissues show that testosterone’s activity relies on reducing it to dihydrotestosterone, which then binds to cytosol receptor proteins. The steroid-receptor complex gets transported to the nucleus, where it initiates transcription events and brings about cellular changes related to androgen action.


Indications and Usage for Testosterone Cypionate


Indications for Testosterone Cypionate Injection include replacement therapy in males with conditions linked to symptoms of deficient or absent endogenous testosterone.

  1. Primary hypogonadism results from testicular failure due to various factors such as cryptorchidism, bilateral torsion, orchitis, or vanishing testis syndrome, or it can occur due to orchidectomy.

  2. Hypogonadotropic hypogonadism, on the other hand, is caused by either congenital or acquired conditions like idiopathic gonadotropin or LHRH deficiency, or pituitary-hypothalamic injury resulting from tumors, trauma, or radiation.



  1. Hypersensitivity to the drug
  2. Males with carcinoma of the breast
  3. Males with known or suspected carcinoma of the prostate gland
  4. Women who are or who may become pregnant
  5. Patients with serious cardiac, hepatic or renal disease



  1. Immobilized patients may experience hypercalcemia. In such cases, discontinue the drug.

  2. Prolonged use of high androgen doses (primarily 17-β alkyl-androgens) has associated with potentially life-threatening complications, including hepatic adenomas, hepatocellular carcinoma, and peliosis hepatis.

  3. Geriatric patients treated with androgens may face an increased risk of developing prostatic hypertrophy and prostatic carcinoma, although conclusive evidence supporting this concept is lacking.

  4. Edema, with or without congestive heart failure, can pose a serious complication in patients with preexisting cardiac, renal, or hepatic disease. Patients being treated for hypogonadism may develop and occasionally experience persistent gynecomastia.

  5. This product contains benzyl alcohol, which has been reported to be associated with a fatal “Gasping Syndrome” in premature infants. Exercise caution when using androgen therapy in healthy males with delayed puberty. Monitor bone maturation by assessing bone age of the wrist and hand every 6 months. Androgen treatment in children may accelerate bone maturation without producing compensatory gain in linear growth, potentially resulting in compromised adult stature. The younger the child, the greater the risk of compromising final mature height.

  6. This drug has not demonstrated its safety and effectiveness in enhancing athletic performance. Avoid its use for such purpose due to the potential risk of serious adverse health effects.



  1. Benign prostatic hypertrophy patients may experience acute urethral obstruction. Development of priapism or excessive sexual stimulation is possible. Prolonged administration or excessive dosage may lead to oligospermia. If any of these effects occur, stop using the androgen and, if resumed, use a lower dosage.

  2. Do not interchange Testosterone Cypionate with testosterone propionate due to differences in duration of action.

  3. Avoid intravenous use of Testosterone Cypionate.


Information for Patients

Patients should be instructed to report any of the following: nausea, vomiting, changes in skin color, ankle swelling, too frequent or persistent erections of the penis.


Laboratory Tests

Hemoglobin and hematocrit levels (to detect polycythemia) should be checked periodically in patients receiving long-term androgen administration.

Serum cholesterol may increase during androgen therapy.


Drug Interactions

Androgens may increase sensitivity to oral anticoagulants. Consequently, the dosage of the anticoagulant may require reduction to maintain satisfactory therapeutic hypoprothrombinemia.

When specialists administer oxyphenbutazone and androgens concurrently, higher serum levels of oxyphenbutazone may result.

In diabetic patients, the metabolic effects of androgens may lead to a decrease in blood glucose levels, thus reducing insulin requirements.


Drug/Laboratory Test Interferences

Androgens may decrease levels of thyroxine-binding globulin, resulting in decreased total T4 serum levels and increased resin uptake of T3 and T4. Free thyroid hormone levels remain unchanged, however, and there is no clinical evidence of thyroid dysfunction.

Questions About Testosterone Cypionate?

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