Weight loss injections are prescription GLP-1 and GLP-1/GIP medicines that curb appetite and slow digestion so you eat less without white-knuckling it. In 2026 there are three FDA-approved injectable options for weight management — semaglutide (Wegovy), tirzepatide (Zepbound), and liraglutide (Saxenda) — plus compounded semaglutide and tirzepatide prescribed through telehealth. Tirzepatide produces the most weight loss of the approved shots; compounded telehealth is the cheapest legitimate way in.
Where to buy weight loss injections
Every real weight loss injection needs a prescription — there is no over-the-counter version, and anything sold without a prescriber is either counterfeit or "research-only" gray-market product. You have two legitimate routes:
- Telehealth (fastest). An online provider evaluates you, writes the prescription, and a licensed US pharmacy ships to your door. This is the quickest and usually cheapest path, especially for compounded semaglutide or tirzepatide. See our roundup of GLP-1 telehealth providers.
- Your own doctor + manufacturer pharmacy. Your prescriber sends the script to Novo Nordisk's NovoCare Pharmacy (Wegovy) or Lilly's self-pay vial program (Zepbound), or to a retail counter.
Whichever route you pick, the drug itself is the same molecule — what changes is the price and how fast you can start. Here is how the options compare.
The options at a glance
| Injection | Active drug | Schedule | Avg. weight loss | Self-pay cash price |
|---|---|---|---|---|
| Zepbound | Tirzepatide | Weekly | 20.9% (SURMOUNT-1) | $349–$499 vials / ~$1,086 pen |
| Wegovy | Semaglutide 2.4 mg | Weekly | 14.9% (STEP 1) | $349/mo ($199 intro), $399 HD pen |
| Saxenda | Liraglutide 3 mg | Daily | 8.0% (SCALE) | Varies; generic now cheaper |
| Compounded | Semaglutide or tirzepatide | Weekly | Dose-dependent | From ~$146/mo via telehealth |
Percentages are mean weight loss from each drug's pivotal trial and are not head-to-head except where noted.
Buy online: The compounded semaglutide and tirzepatide options above are prescribed and shipped by Yücca telehealth — online evaluation, doctor-prescribed, filled by a licensed US pharmacy, from $146/month.
Tirzepatide (Zepbound) — the strongest shot
Tirzepatide is a dual GLP-1 and GIP agonist, sold as Zepbound for weight loss and Mounjaro for type 2 diabetes — the same molecule in two boxes. It is the most effective injection approved in 2026: 20.9% mean weight loss at 15 mg over 72 weeks in SURMOUNT-1, and in the only head-to-head trial, SURMOUNT-5, tirzepatide beat semaglutide 20.2% vs 13.7%. It is also the only weight-loss drug indicated for obstructive sleep apnea.
- Dose: once-weekly injection, titrated from 2.5 mg up to 15 mg.
- Cash price: Lilly's self-pay vials run $349–$499/month; prefilled pens at retail are around $1,086/month. With commercial insurance and a savings card, copays can drop to as little as $25/month.
- Full breakdown in tirzepatide cost and tirzepatide for weight loss.
Semaglutide (Wegovy) — the proven all-rounder
Semaglutide is a GLP-1 agonist sold as Wegovy for weight loss and Ozempic for diabetes. Wegovy delivered 14.9% mean weight loss at 2.4 mg over 68 weeks in STEP 1, and it carries something tirzepatide is still gathering data on: proven cardiovascular protection (a 20% reduction in major cardiac events in SELECT) and kidney protection (FLOW). If you have heart or kidney disease, semaglutide is often the smarter pick even though the scale moves less.
- Dose: once-weekly injection, titrated from 0.25 mg up to 2.4 mg. A higher-dose 7.2 mg HD pen is also available.
- Cash price: $349/month through NovoCare Pharmacy at any standard dose, with a $199/month introductory price for your first 2 fills (new patients, current terms run through June 30, 2026). The HD pen is $399/month. List price is $1,349 but almost nobody pays that — and Novo has said the list falls to $675/month on January 1, 2027.
- Details in the Wegovy guide and Wegovy cost without insurance.
Liraglutide (Saxenda) — the daily veteran
Liraglutide 3 mg (Saxenda) is the oldest injectable weight-loss drug, approved in 2014. It is a daily shot rather than weekly, and the numbers are smaller: 8.0% mean weight loss over 56 weeks in the SCALE trial. Wegovy and Zepbound have largely overtaken it in real-world use. Saxenda's remaining roles are adolescent weight management (approved for ages 12+) and markets where weekly drugs are not covered. Generic liraglutide is now available in some places, which has pushed the price down.
Compounded semaglutide and tirzepatide — the budget route
Compounded versions are custom-mixed by licensed pharmacies rather than made by Novo Nordisk or Lilly. During the 2022–2024 shortages they were widely available; after the FDA declared the tirzepatide and semaglutide shortages resolved, large-scale compounding of straight copies was restricted. Some telehealth platforms still offer compounded semaglutide or tirzepatide as personalized-dose formulations, typically supplied as a multi-dose vial plus syringes and priced from about $146/month.
The trade-off: compounded products are not FDA-approved, so they aren't reviewed for safety, potency, or quality the way brand pens are, and strength can vary between pharmacies. Used through a legitimate, licensed US telehealth provider they are the cheapest way to start. See compounded tirzepatide, semaglutide online, and tirzepatide online before you buy.
Which weight loss injection is right for you?
| Your priority | Best injection |
|---|---|
| Maximum weight loss | Tirzepatide (Zepbound) |
| Heart or kidney protection | Semaglutide (Wegovy) |
| Lowest monthly cost | Compounded semaglutide/tirzepatide via telehealth |
| No weekly commitment / teens 12+ | Liraglutide (Saxenda) |
| Insured with weight-loss coverage | Either Wegovy or Zepbound at ~$25/month with a savings card |
Still deciding between the two big weekly shots? Our which GLP-1 is best for weight loss matrix and Wegovy vs Zepbound comparison go dose-by-dose.
What to expect: side effects and injecting
All of these drugs share the same GI-heavy side-effect profile — nausea, diarrhea, constipation, and vomiting are the most common, usually worst during dose increases and easing over time. Slow titration is the main defense. You inject subcutaneously into the abdomen, thigh, or upper arm, rotating sites each time. For the specifics, see GLP-1 injection sites, Wegovy side effects, and the general GLP-1 side effects guide.
Frequently asked questions
What is the most effective weight loss injection? Tirzepatide (Zepbound) — 20.9% mean weight loss in SURMOUNT-1, and it beat semaglutide head-to-head (20.2% vs 13.7%) in SURMOUNT-5.
What is the cheapest weight loss injection? Compounded semaglutide or tirzepatide through a licensed telehealth provider, from about $146/month. Among brand options, Wegovy and Zepbound both reach roughly $349/month self-pay, or ~$25/month if you have commercial insurance that covers them. See cheapest GLP-1.
Do I need a prescription? Yes. Every legitimate weight loss injection is prescription-only. Telehealth providers can evaluate you and prescribe online if you qualify.
Are weight loss injections safe without insurance? The brand drugs are FDA-approved and sold direct to cash payers at $349–$499/month. Compounded versions are cheaper but not FDA-approved, so use only a licensed US pharmacy through a real prescriber.
How fast do they work? Appetite usually drops within the first week or two, but meaningful weight loss builds over months as you titrate to the maintenance dose — trial results are measured at 56–72 weeks.
