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The Journal

Tirzepatide clinical research, in plain English

Trial summaries, mechanism explainers, safety reviews and pharmacy-regulation guides — sourced to the primary literature and reviewed by a physician.

About the Journal. These are educational articles summarizing published research in plain language. They are not medical advice. Compounded tirzepatide is not FDA-approved. Always consult a licensed clinician. See all clinical references.
Mechanism & pharmacology

How the drug works in the body

How tirzepatide works: GIP + GLP-1

The dual-receptor mechanism, in plain English.

What GIP is & why dual agonism matters

The lesser-known incretin behind tirzepatide's design.

Pharmacokinetics & weekly dosing

Half-life, albumin binding and why one weekly shot works.

Gastric emptying & appetite

How it slows the gut and quiets hunger signals.

Why it's titrated slowly

The science of dose escalation and tolerability.

Tirzepatide vs semaglutide

Mechanism and outcome differences, fairly framed.

Evolution of incretin therapies

From GLP-1 to dual and triple agonists.

Clinical trials

What the major studies found

SURMOUNT-1: weight loss

Up to ~20.9% mean weight reduction without diabetes.

SURMOUNT-2: obesity + type 2 diabetes

Weight loss in a harder-to-treat population.

SURMOUNT-3: lifestyle, then drug

Adding tirzepatide after intensive lifestyle change.

SURMOUNT-4: maintenance & stopping

What happens to weight when you stop.

SURPASS-2: vs semaglutide

The head-to-head diabetes trial.

SURPASS: glycemic outcomes

The diabetes program behind Mounjaro.

SURMOUNT-OSA: sleep apnea

Reducing sleep-apnea severity via weight loss.

SUMMIT: heart failure (HFpEF)

Fewer events in obesity-related HFpEF.

SYNERGY-NASH: fatty liver (MASH)

Biopsy-confirmed improvement in liver disease.

Safety & tolerability

Risks, warnings and how they're managed

GI side effects

Nausea, diarrhea and how they're reduced.

Managing nausea

A practical, evidence-informed playbook.

Thyroid warning (MTC / MEN2)

The boxed warning and who must avoid it.

Pancreatitis & gallbladder

What the evidence shows, and the red flags.

Hypoglycemia risk

Low alone; higher with insulin or sulfonylureas.

Lean muscle mass

Protecting muscle during weight loss.

Outcomes & physiology

Effects beyond the scale

Weight regain after stopping

The biology of why regain is common.

Blood pressure & lipids

Cardiometabolic markers tend to improve.

Cardiovascular risk

Risk markers, SURPASS-CVOT and the caveats.

Prediabetes progression

Delaying type 2 diabetes in high-risk people.

Pharmacy & practical

Compounding, products and use

503A vs 503B compounding

Two pathways, two levels of oversight.

Compounded vs brand pharmacology

How compounded can differ from the brand.

Injection technique & storage

Subcutaneous basics and cold-chain handling.

Keep reading

Pricing & reference hub

New evidence briefs — tirzepatide & semaglutide (July 2026)

Evidence brief · July 2026

Tirzepatide weight loss results by dose: 5, 10, 15 mg

Evidence brief · July 2026

Tirzepatide side effects and titration

Evidence brief · July 2026

Tirzepatide cost without insurance in 2026

Evidence brief · July 2026

Tirzepatide vs semaglutide head-to-head: SURMOUNT-5

Evidence brief · July 2026

Tirzepatide for sleep apnea: SURMOUNT-OSA

Evidence brief · July 2026

Tirzepatide dosing guide: 2.5 mg to 15 mg

Evidence brief · July 2026

Compounded vs brand tirzepatide (Zepbound)

Evidence brief · July 2026

Tirzepatide plateau and maintenance

Evidence brief · July 2026

Tirzepatide for type 2 diabetes (Mounjaro)

Evidence brief · July 2026

How to get tirzepatide prescribed online in 2026

Evidence brief · July 2026

Semaglutide weight loss timeline: month by month

Evidence brief · July 2026

Semaglutide side effects: how long they last

Evidence brief · July 2026

Semaglutide cost without insurance in 2026

Evidence brief · July 2026

Semaglutide dosing schedule: titration guide

Evidence brief · July 2026

Compounded vs brand semaglutide (Wegovy)

Evidence brief · July 2026

Semaglutide and muscle loss: how to prevent it

Evidence brief · July 2026

Semaglutide for prediabetes and heart health

Evidence brief · July 2026

Semaglutide plateau: what to do

Evidence brief · July 2026

Oral vs injectable semaglutide in 2026

Evidence brief · July 2026

How to get semaglutide prescribed online in 2026