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Reviewed by MyPeptideMatch Editorial TeamLast reviewed February 2026Updated February 2026

Semaglutide 20 mg Vial Dosing Protocol

Reconstitution guide, week-by-week titration, and supplies for a 20 mg semaglutide vial.

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Quickstart highlights

Semaglutide is a GLP-1 receptor agonist that enhances insulin secretion and suppresses appetite.

  • Concentration: 10.00 mg/mL (20 mg vial + 2.0 mL bac water).
  • Clean math: 1 unit on a U-100 syringe = exactly 100 µg.
  • Dose range: 300 µg (3 units) up to 2,000 µg (20 units) once weekly.
  • A single vial contains 20+ doses at 1,000 µg — most cost-effective option for 16+ week cycles.

Dosing table

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

WeekDose (µg)UnitsFrequencyNotes
1-23003Once weeklyStarting dose — draw to 3 units on a U-100 syringe
3-46006Once weeklyPause if GI side effects persist
5-6100010Once weeklyMaintenance — at 10 mg/mL, 10 units = 1,000 µg exactly
7+200020Once weeklyHigh-dose phase — only under prescriber guidance

Gradual approach

WeekDose (µg)UnitsNotes
1-42502.5Slower ramp — draw to 2.5 units
5-85005Increase only if tolerating well
9+100010Maintenance — 10 units on a U-100 syringe

Reconstitution steps

  1. Use 2.0 mL bacteriostatic water; inject slowly down the vial wall to yield 10.00 mg/mL.
  2. Gently swirl until fully dissolved; do not shake.
  3. Label the vial with reconstitution date; refrigerate 2–8 °C.

Supplies needed

12-week plan

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

24-week plan

  • 1 vial
  • 24 syringes
  • 2 mL bac water
  • 24 alcohol swabs
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Protocol overview & cycle notes

Extended weight-management cycles using a 20 mg compounded vial. The 10 mg/mL concentration gives clean unit math (1 unit = 100 µg) and enough volume for 20+ doses at 1,000 µg.

Cycle length: 16 weeks on.

Off-cycle: 8 weeks off between cycles; monitor mood and energy during off-cycle.

Storage & handling

Lyophilized: store in cool, dry place until use. Reconstituted: refrigerate 2–8 °C; use within 28–56 days per manufacturer. Avoid freeze-thaw cycles.

Injection & tracking tips

  • Rotate injection sites (abdomen, thigh, upper arm) to reduce irritation.
  • At exactly 10 mg/mL, 1 unit on a U-100 syringe = 100 µg — simple math makes dosing calculations very straightforward.
  • A 20 mg vial supports very long cycles; always use within 28–56 days of reconstitution regardless of remaining volume.

Tracking

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

  • Log injection date, dose (units), and injection site.
  • Track appetite, energy, and any side effects weekly.
Log your cycle in the calculator →

How this works & references

Semaglutide is a GLP-1 receptor agonist that enhances insulin secretion and suppresses appetite. Titration reduces nausea and improves tolerability. Clinical data from the STEP trials support once-weekly dosing for weight management.

Sources

Frequently asked questions

How much bac water do I add to a 20 mg semaglutide vial?
Add 2.0 mL of bacteriostatic water to yield exactly 10 mg/mL. At this concentration, 1 unit on a U-100 syringe equals exactly 100 µg, making dose calculations very straightforward.
How many doses are in a 20 mg vial?
At 10 mg/mL in 2.0 mL, the vial contains 20,000 µg total. That is approximately 67 doses at 300 µg or 20 doses at 1,000 µg maintenance — enough for a full 20-week cycle without switching vials.
Who should choose a 20 mg vial?
The 20 mg vial is ideal for experienced users running longer cycles (16 weeks or more) who are comfortable at maintenance doses. First-time users should start with a 5 mg or 10 mg vial to assess tolerance before committing to a larger vial.
Is the 20 mg vial the same formulation as 5 mg and 10 mg vials?
Yes — the active ingredient is identical semaglutide. The difference is only vial size and reconstitution volume. All three protocols use the same titration schedule (300 µg → 600 µg → 1,000 µg); only the unit counts change due to different concentrations.

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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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