Cetrorelix: track every shot, units to draw and what's still active
GnRH receptor antagonist branded as Cetrotide; FDA-approved to prevent premature LH surges during controlled ovarian stimulation in IVF. In the Peppy catalog, Cetrorelix is reconstituted from a vial and drawn up in units on an insulin syringe, dosed in mg, typically as needed, with a listed half-life of about 30 hours.
Cetrorelix reconstitution calculator
Cetrorelix reconstitution calculator
Free in the appHow long Cetrorelix stays active
Active in your system — Cetrorelix
estimate for one dose, half-life 30 hAn estimate from the half-life, not a measurement. Individual clearance varies. Peppy shows this curve for each protocol under Active in your system.
Cetrorelix dose steps in the catalog
| Cetrorelix — catalog dose ladder | Dose |
|---|---|
| Step 1 | 0.25 mg |
| Step 2 | 3 mg |
Dose steps as listed in the Peppy catalog so the picker is fast — not a recommendation. Your prescriber sets your dose; Peppy tracks it.
How to track Cetrorelix in Peppy
- Open the Protocols tab, tap + and search for Cetrorelix (or Cetrotide). Form, unit and typical frequency are prefilled.
- Enter your vial size, the water you added and your dose. The inline Calculator shows the units to draw and warns if it will not fit a 1 mL syringe.
- Pick a colour and, for injections, a site rotation order. Peppy suggests the next site each time you log.
- On shot day, the Today tab counts down and one tap opens the Log shot sheet with the body map.
- Open the protocol to see Active in your system, the half-life curve for what you have logged (Pro).
- Log a daily check-in (side effects, feelings, weight) and see it lined up against every dose in Progress.
Track Cetrorelix in Peppy
Schedule, units, site rotation and reminders. Free on iPhone, no account.
Free · iPhone · no accountFrequently asked
How many units is 0.25 mg of Cetrorelix?
It depends on how the vial was mixed. Example: a 5 mg vial plus 2 mL of bacteriostatic water is 2.5 mg/mL, so 0.25 mg is 0.1 mL, or 10 units on a U-100 insulin syringe. Change the water and the units change. Use the calculator above with your own vial, and verify with your prescriber.
How long does Cetrorelix stay in your system?
The Peppy catalog lists a half-life of about 30 hours for Cetrorelix. After roughly five half-lives, about 6.2 days, most of a single dose has cleared. That is an estimate from the half-life, not a measurement, and individual clearance varies.
Can I track Cetrorelix in Peppy?
Yes. Cetrorelix is one of 123 compounds built into Peppy, with its form, unit and typical frequency prefilled. Add it as a protocol, set your schedule, and Peppy handles the countdown, the log and the reminders (Pro).
Where should I inject Cetrorelix?
Follow your prescriber's instructions. For subcutaneous shots the GLP-1 labels list the abdomen, thigh and upper arm and say to rotate. Peppy's body map has 13 sites, suggests the next one, and shows when each was last used. Read the site rotation guide.
More in Hormonal
Not medical advice. Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself.