Testosterone cypionate, sold under the brand name Depo-Testosterone among others, is an androgen and anabolic steroid (AAS) medication which is used mainly in the treatment of low testosterone levels in men.[2][3][4] It is also used in hormone therapy for transgender men.[5][6] It is given by injection into muscle or subcutaneously, once every one to four weeks, depending on clinical indication.[4][7][8][9]

Side effects of testosterone cypionate include symptoms of masculinization like acne, increased hair growth, voice changes, and increased sexual desire.[4] Testosterone supplementation is also known to reduce the threshold for aggressive behavior in men.[10]The drug is a synthetic androgen and anabolic steroid and hence is an agonist of the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT).[11][4] It has strong androgenic effects and moderate anabolic effects, which make it useful for producing masculinization and suitable for androgen replacement therapy.[4] Testosterone cypionate is a testosterone ester and a long-lasting prodrug of testosterone in the body.[7][2][3] Because of this, it is considered to be a natural and bioidentical form of testosterone.[12]

Testosterone cypionate was introduced for medical use in 1951.[13][14] Along with testosterone enanthate, testosterone undecanoate, and testosterone propionate, it is one of the most commonly used testosterone esters.[11][4] It is used mainly in the United States.[4] In addition to its medical use, testosterone cypionate is used to improve physique and performance.[4] The drug is a controlled substance in many countries and so non-medical use is generally illicit.[4]