Semaglutide (5 mg Vial) Protocol – aPeptide Dictionary

Overview

Semaglutide is a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist. In clinical research it slows gastric emptying, increases satiety signalling, and improves insulin secretion in a glucose-dependent manner. Research protocols typically use once-weekly subcutaneous administration because of its extended half-life.

Research vials are commonly supplied as lyophilized powder (e.g. 5 mg). Exact titration schedules vary by study design; the table below reflects commonly discussed research starting ranges, not a prescription.

Dosing & Reconstitution Guide

Once weekly u00b7 0.25u20131.0 mg u00b7 Half-life: ~7 days

Reconstitution Table (2 mL mL BAC water u2192 5 mg)

Phase	Dose	Draw (U-100 @ 2 mL)
Start (Weeks 1u20134)	0.25 mg weekly	10 Units
Titrate (Weeks 5u20138)	0.5 mg weekly	20 Units
Maintenance (if tolerated)	1.0 mg weekly	40 Units

Reconstitute 5 mg with 2 mL bacteriostatic water u2192 2.5 mg/mL (2,500 mcg/mL). On a U-100 syringe, 0.25 mg = 10 Units; 0.5 mg = 20 Units; 1.0 mg = 40 Units. Inject subcutaneously (abdomen, thigh, or upper arm). Allow the vial to reach room temperature before reconstitution.

Gastrointestinal effects are dose-related in published trials. Titrate slowly. Not for use outside approved clinical contexts where required by law. Research / educational use framing only.

Potential Benefits & Side Effects

Potential Benefits

Appetite reduction and caloric intake decrease in trials
Improved glycemic markers in type 2 diabetes studies
Clinically documented body-weight reduction with lifestyle support
Once-weekly schedule improves adherence vs daily GLP-1s

Possible Side Effects

Nausea, vomiting, diarrhea (often early in titration)
Constipation
Injection-site reactions
Rare risk signals for pancreatitis / gallbladder disease in labels u2014 monitor study protocols carefully

Storage Instructions

Lyophilized Powder

Short-term (<3 months): Refrigerate at 2u00b0Cu20138u00b0C
Long-term: Freeze at u221220u00b0C or lower
Protect from light and moisture
Allow vial to reach room temperature before opening

Reconstituted Solution

Refrigerate at 2u00b0Cu20138u00b0C u2014 do not freeze
Use within 28 days when reconstituted with BAC water
Always use sterile technique when drawing doses

References

Wilding JPH et al. (2021)

Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1)

View Source

Marso SP et al. (2016)

Semaglutide and Cardiovascular Outcomes in Patients with Type 2 Diabetes (SUSTAIN-6)

View Source

Important Note

This protocol guide is for educational and research purposes only. It is not medical advice. Always consult a qualified healthcare professional before using any peptide compound.