GLP-1 · DOSAGE CALCULATOR
Retatrutide Dosage Calculator
Retatrutide is dosed in milligrams once a week and escalated over months. Enter your vial strength, water volume, and prescribed dose to see the exact draw and how long the vial lasts.
INPUT VALUES
Peptide vial size
10 mg
Total Retatrutide in your vial
Bacteriostatic water
2 mL
Amount of BAC water added
Desired dose
1 mg
Trial protocols started at 1–2 mg weekly and escalated stepwise toward 8–12 mg over several months.
RESULT · AUTO-CALCULATED
Draw to
units on a U-100 insulin syringe · 0.2 mL
- Concentration
- 5000 mcg/mL
- Volume per dose
- 0.2 mL
- mcg per unit
- 50 mcg
- Doses per vial
- 10
Educational only. Reconstitution math is provided to help you follow the instructions from your prescribing provider — it is not a dosing recommendation. Always use the dose your provider prescribed.
About Retatrutide dosing
Retatrutide is a triple agonist — it acts on GIP, GLP-1, and glucagon receptors — and is taken once a week. In phase 2 trials it produced the largest average weight reduction reported for an incretin drug, with the usual GLP-1-class digestive side effects during escalation.
From a 10 mg vial in 2 mL (5 mg/mL), a 1 mg starting dose is 0.2 mL — 20 units — and the vial holds ten of them. At 8 mg the same vial is barely one dose, so plan vial size around the step you are on.
Retatrutide is prescribed at G1 through a telehealth visit. Your provider sets the starting dose and escalation schedule; this calculator converts that dose to a syringe draw.
What is a typical retatrutide dosing schedule?
Study protocols began at 1–2 mg once weekly and stepped up every few weeks toward 8 or 12 mg, with slower escalation reducing nausea. Your provider will individualize the pace; the calculator handles whatever step you enter.
How do I reconstitute retatrutide?
Inject the specified bacteriostatic water slowly down the vial wall, swirl until the powder dissolves completely, and refrigerate. With 2 mL in a 10 mg vial, each 0.1 mL (10 units) holds 0.5 mg.
How long does a 10 mg vial of retatrutide last?
Ten weeks at 1 mg, five at 2 mg, two to three at 4 mg. The result card shows doses per vial for the exact numbers you enter.
AVAILABLE AT G1
Retatrutide is prescribed through G1.
A free telehealth consultation with a licensed provider, a prescription written for you, and pharmaceutical-grade vials shipped cold-chain to your door.