Buy Tirzepatide: Prescription Prices and Research Vials Compared
Checked, not rated · Updated 3 October 2026
You need a prescription to buy tirzepatide legally in the US. With one, Zepbound 2.5 mg costs $299 a month self-pay from Eli Lilly (as of 3 October 2026).
Research vendors also sell research-labelled tirzepatide, which is not the approved medicine.
- Class
- Dual GIP/GLP-1 receptor agonist
- Background
- FDA-approved to improve glycemic control in type 2 diabetes in adults and children 10 years and older, and to reduce cardiovascular risk in adults with type 2 diabetes (Mounjaro), and for chronic weight management and moderate-to-severe obstructive sleep apnoea in adults with obesity (Zepbound).
- Human evidence
- Strong human evidence
The evidence, risks and legal detail: my Tirzepatide guide. Label dosing: Tirzepatide dosage.
How to buy tirzepatide legally
US status: FDA-approved by prescription as Zepbound (weight management and obstructive sleep apnoea) and Mounjaro (type 2 diabetes), both from Eli Lilly.
Prescription needed? Yes. Zepbound and Mounjaro are prescription medicines, and Lilly's self-pay offer says 'Prescription required.'
Lilly self-pay (Zepbound vials and KwikPen)
Legal routeLilly sells Zepbound vials and the multi-dose KwikPen direct to cash-paying patients with a prescription. The 7.5-15 mg KwikPen is $449 when each refill comes within 45 days of the last delivery; otherwise the regular price applies. Lilly's Mounjaro pricing page prints no self-pay price.
| Product | Seller | Price | Size and terms |
|---|---|---|---|
| Zepbound vial or KwikPen 2.5 mg | Eli Lilly | $299.00as of 3 October 2026 | 4 vials or 1 KwikPen; per 1-month supply (28 days). |
| Zepbound vial or KwikPen 5 mg | Eli Lilly | $399.00as of 3 October 2026 | 4 vials or 1 KwikPen; per 1-month supply (28 days). |
| Zepbound vial or KwikPen 7.5 mg | Eli Lilly | $499.00as of 3 October 2026 | 4 vials or 1 KwikPen; per 1-month supply (28 days).Regular price; the KwikPen is $449 with refills within 45 days. |
| Zepbound vial or KwikPen 10, 12.5 or 15 mg | Eli Lilly | $699.00as of 3 October 2026 | 4 vials or 1 KwikPen; per 1-month supply (28 days).Regular price; the KwikPen is $449 with refills within 45 days. |
| Zepbound KwikPen 7.5, 10, 12.5 or 15 mg, refill within 45 days | Eli Lilly | $449.00as of 3 October 2026 | 1 KwikPen; per 1-month supply (28 days, 1 KwikPen).Lilly may end or change the offer at any time. |
TrumpRx.gov pharmacy coupons
Legal routeA US government site listing manufacturer prices for self-pay patients with a prescription. Its Zepbound vial prices for 7.5-15 mg assume a refill within 45 days; later refills cost $499 (7.5 mg) or $699 (10-15 mg).
| Product | Seller | Price | Size and terms |
|---|---|---|---|
| Zepbound vial 2.5 mg | TrumpRx.gov (US government) | $299.00as of 3 October 2026 | 1-month supply; per month. |
| Zepbound vial 5 mg | TrumpRx.gov (US government) | $399.00as of 3 October 2026 | 1-month supply; per month. |
| Zepbound vial 7.5 mg | TrumpRx.gov (US government) | $449.00as of 3 October 2026 | 1-month supply; per month.$499 if the refill comes more than 45 days after the last delivery. |
| Zepbound vial 10, 12.5 or 15 mg | TrumpRx.gov (US government) | $449.00as of 3 October 2026 | 1-month supply; per month.$699 if the refill comes more than 45 days after the last delivery. |
| Zepbound KwikPen 2.5 mg | TrumpRx.gov (US government) | $299.00as of 3 October 2026 | 1 KwikPen; per month.5 mg is $399 and 7.5-15 mg $449 on the same listing. |
| Mounjaro single-dose pens, any strength | TrumpRx.gov (US government) | $499.00as of 3 October 2026 | 4 pens; per month (4 pens).Delivered through LillyDirect. |
Costco Pharmacy member prices
Legal routeCostco Member Value Pricing, with a prescription; it is not insurance. Costco's Zepbound and Mounjaro prices sit above Lilly's self-pay prices, and I could not confirm whether Lilly's card applies there.
| Product | Seller | Price | Size and terms |
|---|---|---|---|
| Zepbound KwikPen 2.5 mg (also 5 and 7.5 mg) | Costco Pharmacy | $499.22as of 3 October 2026 | 1 pen (2.4 mL); per pen (one 28-day supply per Lilly's definition).Warehouse pick-up; home delivery $502.21. |
| Zepbound KwikPen 10, 12.5 or 15 mg | Costco Pharmacy | $699.21as of 3 October 2026 | 1 pen (2.4 mL); per pen.Warehouse pick-up; home delivery $702.20. |
| Zepbound single-dose pens, 2.5-15 mg | Costco Pharmacy | $1086.56as of 3 October 2026 | box of 4 pens; per 4 pens.12.5 mg is $1,078.35. |
| Mounjaro single-dose pens, any strength | Costco Pharmacy | $1103.95as of 3 October 2026 | box of 4 pens; per 4 pens.Home delivery $1,106.94. |
With insurance or Medicare
Legal routeLilly's savings cards bring Zepbound pens and Mounjaro to as little as $25 a fill with commercial insurance that covers them, or $499 a month if it doesn't; the cards expire on 31 December 2026 and exclude government plans. Eligible Medicare Part D patients pay no more than $50 a month for Zepbound through the Medicare GLP-1 Bridge.
| Product | Seller | Price | Size and terms |
|---|---|---|---|
| Zepbound savings card, insurance covers the single-dose pen | Eli Lilly | $25.00as of 3 October 2026 | 1-, 2- or 3-month fill; per 1-, 2- or 3-month fill.Maximum savings $100 a month and $1,300 a year. |
| Zepbound savings card, insurance does not cover the single-dose pen | Eli Lilly | $499.00as of 3 October 2026 | up to 4 single-dose pens; per 1-month fill (28 days, up to 4 single-dose pens). |
| Mounjaro savings card, insurance covers Mounjaro | Eli Lilly | $25.00as of 3 October 2026 | 1-, 2- or 3-month fill; per 1-, 2- or 3-month fill.Maximum savings $150 a month and $1,950 a year. |
| Mounjaro savings card, insurance does not cover Mounjaro | Eli Lilly | $499.00as of 3 October 2026 | up to 4 pens; per 1-month fill (28 days, up to 4 pens).Maximum savings $647 a month. |
| Zepbound through the Medicare GLP-1 Bridge | Eli Lilly | $50.00as of 3 October 2026 | 1-month supply; per month (maximum).Eligible Part D patients prescribed it for weight management. |
| Zepbound list price (WAC), low end | Eli Lilly | $499.00as of 3 October 2026 | one fill; per fill (28-day supply).Lilly gives a range of $499 to $1,086.37 per fill without saying which presentation sits at each end. |
| Mounjaro list price (WAC) | Eli Lilly | $1112.16as of 3 October 2026 | 4 pens; per fill (4 pens, one month). |
Prices come from each seller's, pharmacy's or manufacturer's own page on the date shown, and they change often. "Legal status unclear" means the sources conflict or FDA has not ruled. How prescribing online works: telehealth peptide prescribing.
Research-labelled tirzepatide (not the approved medicine)
A research-labelled tirzepatide vial is not Zepbound or Mounjaro, and vendors often sell it under a code name ('GLP-2(Tirz)', 'Tirzep GLP-2'). FDA says unapproved versions skip its review for safety, effectiveness and quality, and that it has warned companies selling tirzepatide falsely labelled 'for research purposes' or 'not for human consumption'. Its 24 August 2026 letters to Peptide Partners, Royal Peptides and NuScience Peptides named their tirzepatide as an unapproved new drug.
Compared with the approved medicine, a research vial has not been reviewed by FDA, is labelled not for human use, and is tested only as the seller chooses.
FDA warning letters cited on this page: Warning letter: Peptide Partners LLC (24 Aug 2026); Warning letter: Royal Peptides LLC (24 Aug 2026); Warning letter: NuScience Peptides LLC (24 Aug 2026).
The checklist results come from my review of each vendor and cover the whole store. A vendor can publish COAs for some products and not others. The order is not a ranking.
| Vendor | Product | Price | FDA record | Names its lab | Batch COAs | Card payment | Link |
|---|---|---|---|---|---|---|---|
| Next Level PharmMy Next Level Pharm review | Tirzep GLP-2 5 mg vial | $30.99as of 3 October 2026 | No warning letter found | Yes | Yes | Yes | View product → |
| Spartan PeptidesMy Spartan Peptides review | GLP-2(Tirz) 10 mg vial | $250.00as of 3 October 2026 | No warning letter found | Yes | Not verified | Not verified | View product → |
Prices are for the product named, as shown on the vendor's own product page on the date given. They change often. Checklist results were verified on 3 October 2026. All vendors and how they compare.
What a research tirzepatide COA should show
A certificate of analysis (COA) is the lab report for one batch. For tirzepatide, check these:
- Identity by mass spectrometry, with the expected and the measured mass side by side. For tirzepatide, expect about 4,813 Da (C225H348N48O68).
- Purity by HPLC for this batch, shown as a chromatogram as well as a percentage.
- A lot number that matches your vial or pack, the test date and the lab's name, so you can confirm the certificate on the lab's own site.
A purity figure does not cover sterility or bacterial endotoxins; a COA covers those only if it reports separate tests for them. Line by line: how to read a peptide COA.
Red flags when buying research tirzepatide
- A research vial presented as the approved medicine, or sold to you as a treatment.
- No certificate of analysis for the batch you will receive, or one without a lot number or a named lab.
- Dosing instructions or treatment claims for people on the product page.
- An FDA warning letter naming the seller. Search fda.gov before you pay.
- No way to pay with buyer protection, such as a credit card.
Common questions
What is the cheapest way to buy Zepbound without insurance?
Lilly's self-pay vials or KwikPen, with a prescription: $299 a month at 2.5 mg, $399 at 5 mg, then $449 for 7.5-15 mg KwikPen refills within 45 days (3 October 2026). TrumpRx lists the same prices; Costco's member prices are higher, from $499.22 a pen.
Can I buy tirzepatide online?
Yes, with a prescription, from a licensed pharmacy. Lilly sells Zepbound vials and KwikPens direct to self-pay patients, and TrumpRx and Costco list prices. Tirzepatide sold online 'for research' without a prescription is an unapproved product FDA warns against.
How much does tirzepatide cost per month?
Self-pay Zepbound costs $299 to $699 a month by dose, or $449 for 7.5-15 mg KwikPen refills within 45 days. With commercial insurance that covers it, Lilly's card can bring a fill to $25; TrumpRx lists Mounjaro at $499 a month. List prices are $499 to $1,086.37 per Zepbound fill and $1,112.16 per Mounjaro fill.
Where to buy tirzepatide without insurance?
From Lilly's self-pay programme, with TrumpRx coupons at a pharmacy, or from Costco Pharmacy at member prices, each with a prescription. Lilly's own self-pay prices were the lowest of the three on 3 October 2026.
Where can I buy tirzepatide?
Legally, only with a prescription. The legal routes I checked: Lilly self-pay (Zepbound vials and KwikPen); TrumpRx.gov pharmacy coupons; Costco Pharmacy member prices; With insurance or Medicare. Zepbound 2.5 mg costs $299 a month self-pay from Eli Lilly (as of 3 October 2026). Research vendors also sell research-labelled tirzepatide (Next Level Pharm and Spartan Peptides), labelled not for human use; it is not the approved medicine.
Is tirzepatide for sale legally?
Only with a prescription. Zepbound and Mounjaro are prescription medicines, and Lilly's self-pay offer says 'Prescription required.' This is general information, not legal advice.
Sources
- Vendor checks: my review of each vendor, on the date shown under the table. Products and prices: each vendor's own product page.
- Route prices: each seller's, pharmacy's or manufacturer's own page, on the date shown in the table.
- Legal status, class and evidence: my Tirzepatide guide, which cites its sources. Formula, mass and sequence: the structure record shown on that guide, checked against two sources.
- Zepbound pricing information (list and direct-to-patient prices), Eli Lilly and Company.
- Zepbound savings and self-pay, Eli Lilly and Company.
- Mounjaro pricing information (list price), Eli Lilly and Company.
- Mounjaro savings and coverage, Eli Lilly and Company.
- TrumpRx: Zepbound vial, TrumpRx.gov (US government).
- TrumpRx: Zepbound KwikPen, TrumpRx.gov (US government).
- TrumpRx: Mounjaro, TrumpRx.gov (US government).
- Costco Member Value Pricing: Zepbound KwikPen, Costco Pharmacy.
- Costco Member Value Pricing: Zepbound single-dose pen, Costco Pharmacy.
- Costco Member Value Pricing: Mounjaro, Costco Pharmacy.
- FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss (content current as of 1 Oct 2026), US Food and Drug Administration.
- Warning letter: Peptide Partners LLC (24 Aug 2026), US Food and Drug Administration.
- Warning letter: Royal Peptides LLC (24 Aug 2026), US Food and Drug Administration.
- Warning letter: NuScience Peptides LLC (24 Aug 2026), US Food and Drug Administration.