Tirzepatide (GLP-T2)
- Norbert Gallagher
- Jul 23
- 2 min read
Tirzepatide is a dual receptor agonist that activates both GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) receptors at the same time. It is a 39-amino-acid synthetic peptide based on the native GIP sequence, modified with a C20 fatty diacid chain that binds to albumin in the blood and extends the half-life to approximately 5 days. That extended half-life is what allows once-weekly dosing. Tirzepatide works by simultaneously activating two incretin hormone receptors. To understand why this dual activation matters, you need to understand what each receptor does individually and what happens when they work together.
GLP-1 is a hormone your gut naturally releases after you eat. When tirzepatide activates GLP-1 receptors, it produces several effects. It signals the pancreas to release insulin when blood sugar rises. It slows gastric emptying, which means food sits in your stomach longer and you feel full for an extended period. It reduces glucose output from the liver. And it acts on the brain to reduce appetite and diminish the reward value of food.
Tirzepatide (GLP-T2) - 20mg vial add 2ml BAC water: 25 units = 2.5mg
50 units = 5.0mg
75 units = 7.5mg
Weeks 1 to 4 (2.5 mg): Mild to moderate appetite suppression begins. Most people notice they can eat less without feeling deprived. Nausea is common, especially the first week. Some people report minimal weight loss during this phase while others lose 5 to 10 pounds, much of which is water weight and reduced food volume.
Weeks 5 to 12 (5 to 7.5 mg): Appetite suppression becomes more pronounced. This is typically when people notice consistent weekly weight loss of 1 to 3 pounds. Food noise, that constant background thinking about food, significantly decreases. Side effects usually stabilize.
Weeks 13 to 24 (7.5 to 15 mg): Peak effect window for most people. Weight loss is most noticeable during this period. Energy levels often improve as metabolic parameters improve. Blood sugar stabilizes, lipid profiles start shifting.
Weeks 24 to 72 (maintenance dose): Rate of weight loss gradually slows as your body approaches its new equilibrium. This is normal and expected. People who panic here and push their dose unnecessarily are chasing a number, not a result. The metabolic improvements continue even when the scale slows.
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