Triptorelin
Also called Decapeptyl, Trelstar
Intramuscular (into a muscle)Product label
Research reference
Product label
Trelstar depot—not ordinary peptide powder
3.75 mg every 4 weeks, 11.25 mg every 12 weeks or 22.5 mg every 24 weeks; distinct depot strengths
Long-term specialist plan; each depot has its own release period
Trelstar label (2026) ↗When results may show
- When change was measured
- Testosterone and clinical response guide monitoring. These strengths are not interchangeable vials or escalation steps.
- When to assess
- Long-term specialist plan; each depot has its own release period
- Conditions and limitations
- Adults with advanced prostate cancer; exact depot product. Intramuscular biodegradable microgranules cannot be copied to under-the-skin research powder or a pen. Other triptorelin indications/products differ.
- When to stop
- Use the exact product's clinical monitoring and stopping instructions. A supply interval is not a stop date; severe or persistent reactions need prompt clinical review.
Sources: Trelstar label (2026)
Research timing is descriptive, not a promise or personal instruction. A severe or persistent reaction needs prompt clinical review. This is not medical advice.
Modelled level — once a week
1× is the peak after a single dose.
- Steady-state peak
- 1.00× single dose
- Time to steady state
- 15hours
- Administrations
- 1/ week
Read off the modelled curve, not an even-interval formula
About five half-lives
Where these numbers come from
- Trelstar label (2026)Intramuscular biodegradable microgranules cannot be copied to under-the-skin research powder or a pen. Other triptorelin indications/products differ.