Description
Testocyl U® is a sterile oily solution containing testosterone undecanoate, an esterified form of testosterone. The undecanoate ester is attached to the 17β-hydroxyl group of the testosterone molecule and gives the compound a highly lipophilic long-chain ester profile.
The oily injectable form is suited to this long-chain testosterone ester for deep intramuscular administration. After injection, the oil phase forms a depot from which the esterified substance is released before enzymatic hydrolysis of the ester bond yields testosterone. In this type of preparation, the undecanoate ester structure and oil-based vehicle are important factors influencing the depot character of the product.
Further details on composition, method of use, precautions, possible side effects, contraindications and storage are provided in the package leaflet.