Testosterone phenylacetate
[4] Testosterone phenylacetate was a 50 mg/mL microcrystalline aqueous suspension under the brand name Perandren.[6][10] The medication was used to treat hypogonadism and eunuchoidism in males and for palliation of breast cancer in females.[11][9] In 1955, testosterone phenylacetate in aqueous suspension was said to have the longest duration of any clinically used androgen marketed up to that point.[12] Testosterone phenylacetate in aqueous suspension by intramuscular injection, similarly to other aqueous suspension formulations, causes local injection site reactions, including local pain, swelling, and tenderness.[11] The injection site reactions were viewed as less important in the case of testosterone phenylacetate due to its prolonged duration and less frequent administration.