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Reviewed by MyPeptideMatch Editorial TeamLast reviewed February 2026Updated February 2026

Retatrutide Dosing Protocol: 30 mg Vial — Maintenance Dosing & Supplies

Extended supply guide for the 30 mg retatrutide vial — designed for patients established on 8–12 mg maintenance dosing.

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Quickstart highlights

Retatrutide's Phase 2 data (NCT04881760) demonstrated dose-dependent weight loss: 12 mg = 24.2%, 8 mg ≈ 22%, 4 mg ≈ 17.5% at 48 weeks.

  • Concentration: 10 mg/mL (30 mg vial + 3 mL bacteriostatic water).
  • At 10 mg/mL: 8 mg = 80 units (0.8 mL), 12 mg = 120 units (1.2 mL).
  • One 30 mg vial provides ~3.75 doses at 8 mg/week or ~2.5 doses at 12 mg/week.
  • Most efficient vial size for patients stabilized at 8–12 mg weekly maintenance.
  • Refrigerate; use within 28 days of reconstitution.

Dosing table

For educational reference only. Your prescribing provider may adjust doses based on your clinical profile and response.

WeekDose (µg)UnitsFrequencyNotes
1-4100010Once weekly1 mg — 10 units; 30 mg vial provides 30 starting doses
5-8200020Once weekly2 mg — 20 units
9-12400040Once weekly4 mg — 40 units; 7.5 doses per vial
13-16800080Once weekly8 mg maintenance — 80 units; 3.75 doses per vial
17+12000120Once weekly12 mg maximum — 120 units; 2.5 doses per vial

Reconstitution steps

  1. Draw 3 mL bacteriostatic water; inject slowly down the vial wall.
  2. Swirl gently until lyophilized powder is fully dissolved.
  3. Final concentration: 10 mg/mL (30 mg / 3 mL). Label with date and concentration.
  4. Refrigerate at 2–8 °C; use within 28 days.

Supplies needed

12-week plan

  • 1 vial
  • 12 syringes
  • 3 mL bac water
  • 12 alcohol swabs

20-week plan

  • 2 vials
  • 20 syringes
  • 6 mL bac water
  • 20 alcohol swabs
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Protocol overview & cycle notes

Provide an extended multi-week supply of retatrutide from a single 30 mg vial for patients established on 8–12 mg maintenance, minimizing reconstitution events and optimizing cost-efficiency.

Cycle length: 20 weeks on.

Off-cycle: 8–12 weeks off between cycles. Monitor for weight regain and metabolic parameter changes.

Storage & handling

Lyophilized: store below 25 °C. Reconstituted at 10 mg/mL: refrigerate 2–8 °C; use within 28 days. Do not freeze. At maintenance 8 mg: each vial lasts approximately 3.75 weeks.

Injection & tracking tips

  • The 30 mg vial is the most efficient option for maintenance dosing at 8–12 mg weekly — fewer reconstitutions, lower per-dose handling burden.
  • At 10 mg/mL: 8 mg = 80 units (0.8 mL), 12 mg = 120 units (1.2 mL). Use a 1 mL syringe for 8 mg; use a 3 mL syringe for 12 mg.
  • Mark the vial with each draw date and remaining volume to track usage accurately.

Tracking

Logging helps you and your provider spot patterns and adjust dose or timing.

  • Record body weight and BMI monthly at maintenance dosing.
  • Track percentage body fat via DEXA or InBody every 8 weeks if possible.
  • Log fasting glucose, insulin, and HOMA-IR quarterly to monitor insulin sensitivity.
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How this works & references

Retatrutide's Phase 2 data (NCT04881760) demonstrated dose-dependent weight loss: 12 mg = 24.2%, 8 mg ≈ 22%, 4 mg ≈ 17.5% at 48 weeks. The 30 mg vial provides approximately 3.75 weeks of 8 mg maintenance dosing, reducing reconstitution frequency during extended treatment.

Sources

Frequently asked questions

How many weeks does a 30 mg vial last at 8 mg/week?
Approximately 3.75 weeks (30 mg ÷ 8 mg/dose = 3.75 doses). Plan to reconstitute a new vial every 3–4 weeks at 8 mg maintenance. Always use within 28 days.
Is the 30 mg vial the best choice for long-term maintenance?
Yes — for patients stably dosed at 8–12 mg weekly, the 30 mg vial reduces reconstitution events (once every ~4 weeks versus weekly for 5 mg vials), lowering sterility risk and handling burden.
Can I start retatrutide directly at 8 mg using this vial?
No — starting directly at 8 mg is not recommended. The titration protocol (1 mg → 2 mg → 4 mg → 8 mg over 12 weeks) exists to prevent severe GI adverse events. The 30 mg vial is efficient for all phases of titration given its volume.
What happens when I stop retatrutide?
Weight regain of approximately 50–60% of lost weight within 6–12 months after discontinuation is expected, consistent with other GLP-1 class agents. Off-cycle monitoring of appetite, energy, and weight every 4 weeks is recommended. Discuss maintenance strategy with your prescriber.
How does retatrutide affect liver enzymes?
Phase 2 data showed significant reduction in liver fat percentage (MRI-PDFF) with retatrutide — a positive hepatic effect driven by the glucagon receptor component. ALT/AST levels typically improve during treatment. Establish baseline liver enzymes before starting.

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This content is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting any peptide therapy. Dosing and protocols may vary by formulation and prescriber.

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