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Tirzepatide reconstitution protocol
Step-by-step reconstitution and storage parameters for tirzepatide lyophilized vials. Reference values derived from published handling literature.
RECONSTITUTION & RESEARCH PROTOCOLS
Phase 3 RCT evidenceResearch protocol intensities, summarized from published literature. The math is computed for the vial size you pick. Not a dosing recommendation.
Phase 3 SURMOUNT-1 (obesity) and SURPASS series (T2D) published in NEJM.
Reference research protocols from published peer-reviewed studies. Each card cites its source. This calculator is not a dosing recommendation. For research use only. Selection of any specific protocol is the responsibility of the qualified investigator under appropriate institutional oversight.
This protocol describes the reconstitution and storage of lyophilized tirzepatide in standard research workflows. All values are derived from published peptide-handling literature and from the parameters used in major clinical research protocols. Selection of any specific concentration or interval is the responsibility of the qualified investigator.
At a glance
| Parameter | Value |
|---|---|
| Recommended diluent | Bacteriostatic Water (USP, 0.9% benzyl alcohol) |
| Recommended volume (10 mg vial) | 2.0 mL |
| Final concentration | 5 mg/mL |
| Stability — lyophilized | ≥24 months at -20 °C, light-protected, sealed |
| Stability — reconstituted | 30 days at 2–8 °C in original vial |
| Freeze-thaw | Avoid on reconstituted solution. Aliquot if longer-term storage needed. |
Procedure
- Equilibrate. Allow the sealed vial to come to room temperature before reconstitution. Cold glass + cold diluent can produce condensation on the stopper.
- Sterile prep. Wipe the stopper with isopropyl alcohol and allow to dry. Use a sterile syringe and a 21G or larger needle for transfer.
- Inject diluent slowly. Direct the stream of bacteriostatic water along the inner glass wall — not directly onto the lyophilized cake. Rapid injection onto the cake can foam the peptide and damage structure.
- Dissolve gently. Swirl the vial in a slow rotational motion. Do not shake. The lyophilized cake should dissolve within 30–60 seconds.
- Verify. Solution should be clear and colorless. If cloudy, particulate, or discolored, do not use — contact Merit (info@meritpeptides.com) with the lot number.
Storage
Reconstituted tirzepatide is stable for approximately 30 days at 2–8 °C when kept in the original vial. The benzyl alcohol in bacteriostatic water acts as a preservative against microbial growth during this period. Light-protect the vial (most vial stoppers are partially light-permeable).
For storage longer than 30 days, aliquot into sterile single-use tubes and freeze at -20 °C or colder. Avoid freeze-thaw cycles — each cycle introduces degradation. Lyophilized (pre-reconstitution) stability is significantly longer: at least 24 months at -20 °C light-protected.
What you'll need
- Sterile bacteriostatic water (USP) — typically 30 mL multi-dose vial
- Sterile syringes (1 mL or 3 mL) with appropriate-gauge needles
- Isopropyl alcohol wipes (70%)
- Sharps disposal container
- Sterile aliquot tubes if extended freezer storage is planned
Notes
This protocol describes reconstitution parameters used in published peptide-handling literature. It is not a recommendation for any particular study design or application. Selection of concentration, interval, and route is the responsibility of the qualified investigator under appropriate institutional oversight. For research use only. Not for human consumption.
References
- Jastreboff AM, Aronne LJ, Ahmad NN, et al. Tirzepatide Once Weekly for the Treatment of Obesity. NEJM 2022;387:205–216. PMID: 35658024
- Coskun T, Sloop KW, Loghin C, et al. LY3298176, a novel dual GIP and GLP-1 receptor agonist for the treatment of type 2 diabetes mellitus. Mol Metab 2018;18:3–14. PMID: 30473097
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