# Nafarelin: track every shot, units to draw and what's still active

> Reconstitution calculator, twice daily schedule, site rotation and half-life chart for Nafarelin. Track it in Peppy, private on your iPhone.

Source: https://peppytracker.com/compounds/nafarelin/
Last updated: 2026-09-02

GnRH agonist administered as a nasal spray branded as Synarel; FDA-approved for endometriosis and central precocious puberty. In the Peppy catalog, Nafarelin is reconstituted from a vial and drawn up in units on an insulin syringe, dosed in mcg, typically twice daily, with a listed half-life of about 4 hours.

## Frequently asked

### How many units is 200 mcg of Nafarelin?

It depends on how the vial was mixed. Example: a 2 mg vial plus 2 mL of bacteriostatic water is 1 mg/mL, so 200 mcg is 0.2 mL, or **20 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 Nafarelin stay in your system?

The Peppy catalog lists a half-life of about 4 hours for Nafarelin. After roughly five half-lives, about 20 hours, 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 Nafarelin in Peppy?

Yes. Nafarelin 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 Nafarelin?

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](https://peppytracker.com/guides/injection-site-rotation/).

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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.

Peppy is a free iPhone app (Pro subscription optional). App Store: https://apps.apple.com/us/app/peptide-tracker-peppy/id6775005514