Semaglutide (20mg Vial) Dosage Protocol

Quickstart Highlights

Semaglutide is a glucagon-like peptide-1 (GLP-1) receptor agonist with a prolonged half-life of approximately 7 days^[1], approved for chronic weight management and glycemic control. The extended half-life enables once-weekly subcutaneous dosing, which is the standard clinical approach^[1]. This educational protocol presents a gradual weekly titration from 0.25 mg up to a maintenance dose of 2.4 mg over 16+ weeks, using a practical dilution for precise insulin-syringe measurements.

Reconstitute: Add 3.0 mL bacteriostatic water → ~6.67 mg/mL concentration.

Weekly dose range: 250–2400 mcg (0.25–2.4 mg) once weekly (gradual escalation protocol).

Easy measuring: At 6.67 mg/mL, 1 unit = 0.01 mL ≈ 66.7 mcg on a U-100 insulin syringe.

Storage: Lyophilized: freeze at −20 °C (−4 °F); after reconstitution, refrigerate at 2–8 °C (35.6–46.4 °F) and use within 28 days.

Dosing & Reconstitution Guide

Educational guide for reconstitution and weekly titration dosing

Standard / Gradual Titration (3 mL = ~6.67 mg/mL)

Week	Weekly Dose	Units (per injection) (mL)
Weeks 1–4	250 mcg (0.25 mg)	4 units (0.04 mL)
Weeks 5–8	500 mcg (0.5 mg)	7.5 units (0.075 mL)
Weeks 9–12	1000 mcg (1.0 mg)	15 units (0.15 mL)
Weeks 13–16	1700 mcg (1.7 mg)	25.5 units (0.255 mL)
Weeks 17+ (Maintenance)	2400 mcg (2.4 mg)	36 units (0.36 mL)

Frequency: Inject once weekly subcutaneously. This gradual titration protocol improves tolerability and is consistent with FDA-approved dosing strategies for weight management^[1]^[3]. Administer on the same day each week at any time, with or without meals.

Reconstitution Steps

Draw 3.0 mL bacteriostatic water with a sterile syringe.

Inject slowly down the vial wall to minimize foaming; avoid shaking.

Gently swirl or roll the vial until the powder is fully dissolved.

Label the vial with the reconstitution date and refrigerate at 2–8 °C (35.6–46.4 °F), protected from light.

Use reconstituted solution within 28 days for maximum potency and safety^[8].

Important: This guide is for educational purposes only and is not medical advice. For research use only. Not for human consumption.

Supplies Needed

Plan based on an 8–20 week weekly titration protocol.

Peptide Vials (Semaglutide, 20 mg each):

8 weeks ≈ 1 vial (3 mg total used)
12 weeks ≈ 1 vial (7 mg total used)
16 weeks ≈ 1 vial (13.8 mg total used)
20 weeks ≈ 2 vials (23.4 mg total used with maintenance dosing)

Insulin Syringes (U-100):

Per week: 1 syringe
8 weeks: 8 syringes
12 weeks: 12 syringes
16 weeks: 16 syringes
20 weeks: 20 syringes

Bacteriostatic Water (10 mL bottles): Use ~3.0 mL per vial for reconstitution.

8 weeks (1 vial): 3 mL → 1 × 10 mL bottle
12 weeks (1 vial): 3 mL → 1 × 10 mL bottle
16 weeks (1 vial): 3 mL → 1 × 10 mL bottle
20 weeks (2 vials): 6 mL → 1 × 10 mL bottle

Note: Use bacteriostatic water within 28 days after opening^[9].

Alcohol Swabs: One for the vial stopper + one for the injection site each week.

Per week: 2 swabs
8 weeks: 16 swabs
12 weeks: 24 swabs
16 weeks: 32 swabs
20 weeks: 40 swabs → recommend 1 × 100-count box

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Protocol Overview

Concise summary of the once-weekly regimen.

Goal: Support chronic weight management through GLP-1 receptor activation, leading to reduced appetite and improved metabolic parameters^[1].

Schedule: Weekly subcutaneous injections for 16–20+ weeks with gradual dose escalation.

Dose Range: 250 mcg (0.25 mg) to 2400 mcg (2.4 mg) weekly with stepwise titration every 4 weeks to improve tolerability.

Reconstitution: 3.0 mL per 20 mg vial (~6.67 mg/mL) for accurate unit measurements on standard insulin syringes.

Storage: Lyophilized frozen at −20 °C (−4 °F); reconstituted refrigerated at 2–8 °C (35.6–46.4 °F); use within 28 days; avoid repeated freeze–thaw cycles.