Description
Product Specifications
| Attribute | Details |
|---|---|
| Product Name | Testosterone Undecanoate Injection |
| Generic Name | Testosterone Undecanoate |
| CAS Number | 5949?44?0 |
| Molecular Formula | C??H??O? |
| Molecular Weight | ~456.7?g/mol |
| Dosage Form | Sterile oil-based injectable solution |
| Strength | 0.25?g (250?mg) per 2?mL vial |
| Pack Size | 2 vials/box; 10 boxes/carton |
| Approval Number | China NMPA H10900063 |
| Product Code | 86904735000482 |
| Manufacturer | Zhejiang Xianju Pharmaceutical Co., Ltd. |
| Barcode | 6923703203469 |
| Storage Conditions | Store at 2–25?°C; protect from light |
| Intended Use | Laboratory and preclinical research only |
Mechanism of Action
Testosterone undecanoate is an esterified form of testosterone designed for slow release via intramuscular injection, metabolized by esterases to active testosterone, which then activates androgen receptors and influences gene expression in muscle, bone, and reproductive tissues .
Research Applications & Pharmacology
Hormone Replacement Models: Achieves stable serum testosterone levels for 6–12 weeks with single doses, thanks to a prolonged half-life (~18–34 days) .
Contraception & Bone Health: Used in male contraception and osteoporosis models; shows efficacy in increasing bone mineral density accessdata.fda.gov.
Metabolic & Body Composition Studies: Improves lean mass, insulin sensitivity, and lipid profiles in animal and human trials .
Pharmacokinetics: Serum testosterone peaks ~7 days post-injection; half-life ranges 18–34 days; maintenance dosing every 6–12 weeks required for steady levels .
Safety Profile & Handling
Common Adverse Events: Injection site pain, acne, erythrocytosis, weight gain .
Serious Risks: Potential pulmonary oil microembolism (POME), prostate hypertrophy/cancer risk, elevated hematocrit .
Contraindications: Avoid in prostate/breast cancer, liver tumor history, or females due to virilization risk medicines.org.uk.
Handling Guidelines: Use aseptic technique, deep gluteal IM injection; monitor animals for cardiovascular and pulmonary signs.


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