1. Drug Classification
Class: Androgen / Anabolic Steroid (AAS)
Type: Long-chain testosterone ester
Primary role: Active pharmaceutical ingredient (API) for long-acting testosterone products
2. Chemical Identity
Chemical name: Testosterone 17β-undecanoate
Molecular formula: C₃₀H₄₈O₃
Molecular weight: 456.7 g/mol
CAS number: 5949-44-0
Ester type: Undecanoate (C11 ester chain)
Appearance: White to off-white crystalline powder
3. Physical & Chemical Characteristics
Melting point: Typically around 60–65°C
Solubility:
Insoluble in water
Soluble in organic oils and many organic solvents
Stability:
Stable under normal dry storage conditions
Sensitive to prolonged moisture and light exposure
4. Pharmacological Profile
Mechanism: Prodrug released as free testosterone after enzymatic cleavage
Release characteristics:
One of the longest-acting testosterone esters
Supports very prolonged absorption in approved injectable formulations
Applications: Used in extended-release products due to long half-life
5. Medical Context (Raw → Formulated Products Only)
When manufactured into approved medications, it is used for:
Male hypogonadism treatment
Gender-affirming hormone therapy (when part of approved formulations)
Sometimes delayed puberty (clinician-supervised)
6. Storage (General Material-Safety Guidelines)
Store in a cool, dry, light-protected environment
Avoid humidity and temperature fluctuations
Follow local controlled-substance regulations for handling
