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Tirzepatide (Mounjaro / Zepbound)

Evidence: ★★★★★ · Status: Prescription

💡 Did you know? Tirzepatide (Mounjaro) hits two gut-hormone receptors at once — GLP-1 and GIP — which is a big reason it tends to beat single-target Ozempic on weight.

In plain English

Hits two "I'm full" gut-hormone switches at once instead of one — so it works even better. SURMOUNT-1: 22.5% bodyweight lost, approaching bariatric-surgery territory.

How it works

Dual agonist of GIPR (GIP receptor) and GLP1R. GIP receptor activation in the hypothalamus and adipose tissue synergises with GLP-1, producing greater appetite suppression and fat loss than GLP-1 alone.

Molecular target & official sources

GIPR gastric inhibitory polypeptide receptor (NCBI Gene) · GLP1R (NCBI Gene) · Tirzepatide (PubChem CID 156588324)

Protocol

Weekly injection titrated 2.5 → 15 mg.

Watch out

Same as semaglutide; muscle-loss risk is greater given larger total loss.

Bottom line

Currently the most effective *approved* obesity drug.

Helps with: Lose Fat · Hormones & Testosterone · Gut Health

The human evidence

SURMOUNT trials show ~20–22% average body-weight loss — the largest yet for a pharmacological agent — via dual GIP/GLP-1 receptor action. SURPASS trials show strong glucose control in type 2 diabetes.

Stacks with

Prescription only. As with any GLP-1, protect muscle with protein and resistance training.

Shares a pathway — often paired with: Caffeine, Semaglutide (Ozempic / Wegovy / Rybelsus), Retatrutide, Liraglutide (Saxenda / Victoza).

Avoid combining with

Same thyroid (MTC/MEN2) contraindication as GLP-1 agonists; watch for pancreatitis and gallbladder issues. Titrate to manage GI side effects.

Availability & where to buy

Prescription only. Prescription-only — a doctor must prescribe it. Not sold over the counter. (In Singapore: HSA-regulated.) Singapore: private-pay, typically higher than semaglutide; prescription required.

How it works: the GPCR → cAMP pathway →

Used in these protocols

Compare Tirzepatide (Mounjaro / Zepbound)

Common questions

Does Tirzepatide (Mounjaro / Zepbound) actually work?

Human-evidence rating: 5 of 5. Currently the most effective approved obesity drug.

How do you take Tirzepatide (Mounjaro / Zepbound)?

Weekly injection titrated 2.5 → 15 mg.

What are the risks or side effects of Tirzepatide (Mounjaro / Zepbound)?

Same as semaglutide; muscle-loss risk is greater given larger total loss.

Is Tirzepatide (Mounjaro / Zepbound) legal or approved?

Regulatory status: Prescription.