FDA-ApprovedInjectable pen (subcutaneous)

Zepbound

tirzepatide · Eli Lilly

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Key Facts

Form

Injectable pen (subcutaneous)

Frequency

Once weekly

Available Doses

2.5mg5mg7.5mg10mg12.5mg15mg

FDA Approval Date

November 8, 2023

Mechanism

Dual GLP-1 + GIP receptor agonist

Manufacturer

Eli Lilly

Cost

Self-Pay

$499/mo flat (all doses) via LillyDirect

With Savings Card

$25/mo for commercially insured patients

List Price

~$1,086/mo

LillyDirect self-pay recently updated to $499/mo flat rate for all doses.

Side Effects

Side Effect	Rate	Source
Nausea	~28%	SURMOUNT-1, 15mg dose
Diarrhea	~23%	SURMOUNT-1, 15mg dose
Vomiting	~12%	SURMOUNT-1, 15mg dose
Constipation	~11%	SURMOUNT-1, 15mg dose
Injection site reactions	~3.2%	SURMOUNT-1
Hair loss	~5%	SURMOUNT-1

Source: SURMOUNT-1 Phase 3 Trial, tirzepatide 15mg, 72 weeks

Weight Loss Results

SURMOUNT-1

~22.5%

72 weeks · Completers analysis

72 weeks

Tirzepatide 15mg vs placebo. Highest weight loss of any single-agent GLP-1 class drug.

SURMOUNT-1

~20.9%

72 weeks · Treatment regimen (ITT)

72 weeks

Treatment regimen estimate — all randomized patients.

How It Works

Zepbound activates both GLP-1 and GIP receptors — two key incretin hormones involved in appetite regulation and metabolism. GLP-1 activation reduces appetite, slows gastric emptying, and improves insulin sensitivity. GIP activation adds complementary metabolic benefits including enhanced fat breakdown and additional appetite suppression. The dual mechanism is why Zepbound achieves higher weight loss than GLP-1-only drugs.

Mechanism: Zepbound (tirzepatide) is the first FDA-approved dual incretin agonist, activating both GLP-1 and GIP receptors. This dual mechanism provides enhanced metabolic effects compared to GLP-1-only drugs, leading to the highest weight loss seen in any single-agent GLP-1 class medication.

Who It's For

Indication

Chronic weight management (obesity or overweight with comorbidities)

Adults with obesity (BMI ≥30) or overweight (BMI ≥27) with at least one weight-related condition. Best for patients who need maximum weight loss and are comfortable with weekly injections. Lilly recommends patients may later switch to Foundayo for oral maintenance.

Food & Water Restrictions

✅ No Restrictions

This medication can be taken at any time of day, with or without food and water.

Switching Guides

Lilly's Recommended Path

Zepbound → Foundayo

Read guide

Cross-Class Switch

Zepbound → Wegovy Pill

Read guide

Comparisons

Comparison

Foundayo vs Zepbound

Read comparison

Helpful Articles

Switching

Starting Foundayo: The Practical Checklist Before Your First Dose

Starting Foundayo? Use this practical checklist before your first dose, including what to ask your prescriber, what side effects to expect, cost planning, and when to call for help.

Comparisons

Best Oral GLP-1 for Weight Loss in 2026: Foundayo vs Oral Wegovy vs Rybelsus

Compare the best oral GLP-1 medications for weight loss in 2026, including Foundayo, oral Wegovy, and Rybelsus. Weight loss, side effects, cost, and who each option fits best.

Comparisons

GLP-1 Pill vs Injection: Which Is Better for Weight Loss?

Compare GLP-1 pills (Foundayo, Wegovy oral, Rybelsus) vs injections (Wegovy, Zepbound, Ozempic, Mounjaro). Weight loss data, convenience, cost, and which is right for you.

Cost & Insurance

How Much Does Foundayo Cost? Complete Pricing Guide (2026)

Foundayo (orforglipron) costs $149-$249/month self-pay, $25/month with savings card, $50/month on Medicare. Full 2026 pricing breakdown with insurance tips.

Zepbound fact review snapshot

Medication

Zepbound

Tracked facts

Human verified

Last refreshed: 2026-04-07

This page pulls from MedSwitcher's structured medication fact database. Facts are tracked separately from page copy so we can update sources, pricing, and trial details without guessing.

Primary source trail

Zepbound Prescribing Information
SURMOUNT-1
LillyDirect Zepbound pricing

Want the boring but important details? Read our editorial policy and methodology.

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Compare GLP-1 Providers

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MEDViBest Value

GLP-1 weight loss program — take a 60-second quiz to see if you qualify. Compounded semaglutide and tirzepatide from $99/month with provider support.

Starts at $99/mo — one of the most affordable GLP-1 programs

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Affordable GLP-1 prescriptions — no insurance needed

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Eden HealthFast Approval

GLP-1 weight loss program with direct provider intake. Licensed providers prescribe compounded semaglutide and tirzepatide.

Direct intake with licensed GLP-1 providers — fast approval

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Recommended Products

Supplies and tools commonly used by GLP-1 patients during their treatment journey.

BD Home Sharps Container (1.4 Qt)Safe Disposal

Medical-grade sharps container for safe disposal of injection pens and needles. Holds ~300 pen needles.

Metene Blood Glucose Monitor KitGlucose Monitor

Complete glucose monitoring kit with 100 strips, 100 lancets, and carrying case. No coding required.

Etekcity Food Kitchen ScalePortion Control

Rechargeable stainless steel scale for portion control — essential during GLP-1 weight loss.

AUVON Insulin Cooler Travel CaseTravel Case

Insulated case with TSA-approved ice packs. Keeps Ozempic, Wegovy, Zepbound pens cold 4-8 hours.

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Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice. Clinical trial data referenced comes from published studies and FDA prescribing information. Side effect rates are from specific clinical trials and may not reflect real-world experience. Always consult your healthcare provider before starting, stopping, or switching any medication.