PRODUCT INFORMATION UPDATED DAILY
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Metabolic

Tirzepatide

5mg vial

Tirzepatide (LY-3298176) is a 39-amino-acid synthetic dual GIP and GLP-1 receptor agonist developed by Eli Lilly. Marketed as Mounjaro (T2D) and Zepbound (obesity), it produces class-leading weight loss and glycaemic outcomes - adding GIP receptor activity to the established GLP-1 pathway for amplified incretin effect and improved adipocyte lipid handling.

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Researched for

  • 20.9% mean weight reduction at 15mg/week over 72 weeks (SURMOUNT-1, NEJM 2022)
  • HbA1c reductions of 1.8–2.4% vs placebo (SURPASS program)
  • Improvements across triglycerides, LDL, blood pressure and hepatic fat
  • Superior weight and glycaemic outcomes vs semaglutide head-to-head (SURMOUNT-5, 2024)
  • Cardiovascular and renal protective signals under active investigation
  • NASH resolution and MACE reduction trials ongoing

Mechanism of action

Balanced agonism of GIP receptors (incretin amplification, adipocyte lipid metabolism, neutral-to-positive insulin sensitivity effects) and GLP-1 receptors (glucose-dependent insulin secretion, glucagon suppression, satiety, delayed gastric emptying). Albumin-binding C20 fatty acid chain enables once-weekly dosing.

Research protocol

Standard titration: 2.5mg weekly (weeks 1–4) → 5mg (weeks 5–8) → 7.5mg → 10mg → 12.5mg → 15mg weekly maintenance, escalating every 4 weeks based on tolerability. Subcutaneous (abdomen, thigh, upper arm). Research protocols typically 24–72 weeks.

Half-life

approx. 120 hours (approx. 5 days), supporting once-weekly dosing.

Reconstitution

Reconstitute a 10mg vial with 2mL bacteriostatic water for a 5mg/mL working concentration. Swirl gently - do not shake. Allow to sit 2–3 minutes before use.

Storage

Lyophilised: 2–8°C, stable 24–36 months frozen. Reconstituted: 2–8°C, do not freeze, use within 28 days.

Research considerations
  • GI side effects (nausea, vomiting, diarrhoea, constipation) reported in 40–60% of trial participants - dose-dependent.
  • Lean mass loss accompanies weight loss - resistance training and adequate protein intake are critical.
  • Class-level warnings include pancreatitis, gallbladder disease and gastroparesis; thyroid C-cell tumour boxed warning extrapolated from rodent data.