Semaglutide 20 mg Vial Dosing Protocol
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.
| Week | Dose (µg) | Units | Frequency | Notes |
|---|---|---|---|---|
| 1-2 | 300 | 3 | Once weekly | Starting dose — draw to 3 units on a U-100 syringe |
| 3-4 | 600 | 6 | Once weekly | Pause if GI side effects persist |
| 5-6 | 1000 | 10 | Once weekly | Maintenance — at 10 mg/mL, 10 units = 1,000 µg exactly |
| 7+ | 2000 | 20 | Once weekly | High-dose phase — only under prescriber guidance |
Gradual approach
| Week | Dose (µg) | Units | Notes |
|---|---|---|---|
| 1-4 | 250 | 2.5 | Slower ramp — draw to 2.5 units |
| 5-8 | 500 | 5 | Increase only if tolerating well |
| 9+ | 1000 | 10 | Maintenance — 10 units on a U-100 syringe |
Semaglutide 20 mg Vial Dosage Calculator
This free peptide calculator shows the exact insulin-syringe units to draw for Semaglutide 20 mg Vial. Enter your vial size, bacteriostatic water and target dose — it’s pre-loaded with common Semaglutide 20 mg Vial reconstitution defaults, so you can adjust any field to match your own vial.
Your free Semaglutide 20 mg Vial tracker
- Dose reminders
- Injection logging
- Cycle progress
Reconstitution steps
- Use 2.0 mL bacteriostatic water; inject slowly down the vial wall to yield 10.00 mg/mL.
- Gently swirl until fully dissolved; do not shake.
- 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
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
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.
How this works & references
Sources
- Once-Weekly Semaglutide in Adults with Overweight or Obesity. Wilding JPH et al. — N Engl J Med — 2021
- FDA – Wegovy (semaglutide) prescribing information
- Clinical Pharmacokinetics of Semaglutide: A Systematic Review. Yang XD et al. — Drug Des Devel Ther — 2024
- Clinical Pharmacokinetics of Oral Semaglutide: Analyses of Data from Clinical Pharmacology Trials. Overgaard RV et al. — Clin Pharmacokinet — 2021
Frequently asked questions
How much bac water do I add to a 20 mg semaglutide vial?
How many doses are in a 20 mg vial?
Who should choose a 20 mg vial?
Is the 20 mg vial the same formulation as 5 mg and 10 mg vials?
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View protocolThis 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.