You're comparing two different products: TrimRx's homepage lists “Starting at $147” for compounded semaglutide and tirzepatide, while Zepbound is Eli Lilly's FDA-approved tirzepatide product. The label lists nausea, diarrhea and vomiting as Zepbound's most common side effects, and TrimRx says it uses licensed providers and pharmacies, so here's what each option offers and who it suits.
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Is tirzepatide FDA approved?
Yes, Zepbound is. The Zepbound FDA label lists it for use with a reduced-calorie diet and more physical activity, to reduce excess body weight and keep weight off long term in adults with obesity, or in adults with overweight who also have at least one weight-related condition. The same label lists moderate to severe obstructive sleep apnea in adults with obesity.
Compounded tirzepatide is a different thing. TrimRx's own safety page says: “Compounded medications have NOT been evaluated by the FDA for safety, effectiveness, or quality.” That is the main difference when you compare prices.
Zepbound is an injectable prescription medicine, injected under the skin once a week. The Zepbound Medication Guide lists its ingredients and side effects. TrimRx's safety page also calls Mounjaro the brand name for the same active ingredient as Zepbound.
TrimRx vs Zepbound at a glance
| Question | Zepbound | TrimRx |
|---|---|---|
| What it is | Injectable prescription medicine containing tirzepatide, used with a reduced-calorie diet and more physical activity | Online medical service; says it offers compounded tirzepatide and compounded semaglutide and, when medically appropriate, FDA-approved branded medications such as Zepbound |
| Who makes or sells it | Eli Lilly and Company, per the Medication Guide | TrimRx, per its homepage |
| FDA status | FDA-approved, per the Zepbound FDA label | Says compounded medicines “have NOT been evaluated by the FDA for safety, effectiveness, or quality” |
| How you get it | Prescribed by a clinician, then filled at a pharmacy | Online health questionnaire; a licensed provider reviews it and, if appropriate, prescribes |
| Active ingredient | Tirzepatide | Compounded tirzepatide (listed as GLP-1 + GIP) and compounded semaglutide (listed as GLP-1) |
| Dose per injection | Pens and vials from 2.5 mg to 15 mg, per the label | Ask TrimRx for the milligrams per injection before you order |
| Price | Ask your pharmacist or prescriber about cost | “Starting at $147” as of October 23, 2026 |
What is in each one?
Zepbound's active ingredient is tirzepatide. The Medication Guide lists its inactive ingredients as sodium chloride, sodium phosphate dibasic heptahydrate and water for injection. The multi-dose vial and single-patient KwikPen also list benzyl alcohol, glycerin and phenol. The label lists pen and vial strengths from 2.5 mg to 15 mg per weekly injection, and your prescriber picks yours.
TrimRx's homepage lists two compounded products as in stock: “Compounded GLP-1 + GIP (Contains: Tirzepatide)” and “Compounded GLP-1 (Contains: Semaglutide).” Its safety page says compounded products may contain different inactive ingredients than FDA-approved versions, and that “Quality, potency, and purity may vary between compounding pharmacies.” Ask TrimRx for the milligrams per injection before you order, so you can compare it with the Zepbound label.
What does each one cost?
As of October 23, 2026, TrimRx's homepage said “Starting at $147” for compounded semaglutide and tirzepatide, and said prescription and telemed visits are included with no insurance required. It also says “Same price, every dose. No hidden fees.” Its discount messages do not match: the promo banner says “Save $140 + Free Shipping,” a separate box says “Get $120 Off Today!”, and the in-stock product cards say “$140 OFF.” Check at checkout which offer applies to you.
To work out your cost per day, ask TrimRx what the $147 covers, how many injections it includes, and whether it renews.
Ask your pharmacist or prescriber about cost.
What are the side effects of Zepbound, and who should ask a clinician first?
The Zepbound Medication Guide lists these as the most common side effects: nausea, diarrhea, vomiting, constipation, stomach pain, indigestion, injection site reactions, feeling tired, allergic reactions, belching, hair loss and heartburn.
The same guide lists serious problems to report right away: severe stomach problems, dehydration that can lead to kidney problems, gallbladder problems and pancreatitis. The label carries a boxed warning on thyroid C-cell tumors seen in rats. The Medication Guide says the thyroid tumor risk in people is uncertain.
In the label's pooled placebo-controlled weight trials, 2,519 adults took Zepbound for up to 72 weeks. Stopping because of side effects happened in 4.8%, 6.3% and 6.7% of people on 5, 10 and 15 mg, against 3.4% on placebo. Most who stopped did so in the first few months, mainly because of stomach problems.
The label says Zepbound must not be used if you or a family member has had medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2, or if you have had a serious allergic reaction to tirzepatide. Ask a clinician first if you:
- take insulin or a sulfonylurea, since the label notes a higher risk of low blood sugar
- use oral hormonal birth control; the label says to switch to a non-oral method or add a barrier method for 4 weeks after starting and after each dose increase
- are pregnant, planning a pregnancy or breastfeeding; the label says weight loss is not recommended during pregnancy, and Zepbound may pass into breast milk
- have a history of depression or suicidal thoughts, which the label says to monitor
- have type 2 diabetes with diabetic retinopathy, which the label says to monitor
- take oral medicines that depend on exact blood levels, or warfarin, since the label says Zepbound can slow stomach emptying
- have surgery planned; the Medication Guide says to tell every healthcare provider you are taking it
TrimRx's safety pages reproduce the Zepbound safety information. For its compounded medicines, its own list of risks says they may have different side effects than FDA-approved versions, that quality and potency may vary between compounding pharmacies, and that there is “Limited data on long-term safety and effectiveness.”
What does the research show?
A review of randomized trials pools results for tirzepatide in adults with obesity who do not have type 2 diabetes. It searched studies published from January 1, 2020, through April 25, 2025, and measured weight loss, cardiometabolic and quality-of-life outcomes, and adverse events. The pooled tirzepatide trial review found pooled weight reductions above 16% in people, with higher odds of losing 15% or 20% of body weight than earlier GLP-1 monotherapy results (typically 6% to 10%). The effect was dose-dependent, and the authors attribute the larger loss to tirzepatide's dual action on GIP and GLP-1 receptors. Stomach side effects were the most common limit on tolerability, and serious adverse events did not rise.
In the label's pooled weight trials, acute pancreatitis was confirmed in 0.2% of Zepbound patients and 0.2% of placebo patients. The label still says to watch for persistent severe abdominal pain and to discontinue Zepbound if pancreatitis is suspected.
How do refunds, cancellation and shipping work?
TrimRx's homepage lists “No Hidden Fees,” “No Monthly Membership” and “Cancel Anytime.” It says shipping is free, but gives two delivery times: “Arrives in 1-2 days” in one place and “Free & Discreet 2-Day Delivery” in another. Ask TrimRx for its refund window in writing before you pay, along with what happens if you cancel partway through a supply.
For Zepbound, ask your pharmacy for its return policy on a prescription injection before you fill it.
What do buyers say about TrimRx?
TrimRx's homepage shows a rating of 4.8 and the line “Excellent! Over 100,000+ happy customers,” along with customer reviews on the page. Those figures and testimonials are TrimRx's own. Search for independent customer complaints too, so you see more than TrimRx's own page.
Is TrimRx legit, and is it compounded?
TrimRx describes itself as a fully online medical service and lists phone 888-896-1612 and hello@trimrx.com. It says it works only with licensed U.S. pharmacies, that its providers are licensed, and that its compounded products contain the same active molecules used in brand-name medications. Its process is a short health questionnaire, a licensed provider's review and, if appropriate, a prescription, with the medicine shipped to your door.
Yes, its products on the homepage are compounded. Its safety page also says it offers FDA-approved branded medications, such as Zepbound, and compounded formulations when medically appropriate. Confirm which version your prescription is for before you order.
Three checks before you pay: ask which licensed pharmacy fills your order, confirm your state is one where its providers operate (TrimRx says entering your state at signup confirms this), and get the milligrams per injection in writing.
Who does each one suit?
Zepbound suits you if you want the FDA-approved branded product and are ready to work with a prescriber and pharmacy on a weekly injection. TrimRx suits you if you want an online-first visit, are comfortable with compounded medicines, and want its listed starting price, free shipping and no membership. This comparison does not name a winner on effectiveness. The choice turns on the questions below.
Before you order
- Do you want the FDA-approved product, or a compounded one that TrimRx says has not been evaluated by the FDA?
- What does the $147 cover at checkout, how many injections does it include, and does it renew?
- Which of the $140 or $120 offers applies to you?
- How many milligrams is each injection, and who sets that amount?
- What is the refund window, in writing?
- Do any of the clinician-first points above apply to you?
Take that list to your prescriber, or to TrimRx's chat, before you commit. For the wider plan around any medication, read your guide to healthy weight loss and why strength training is key to long-term fat loss matters over time. If you are also weighing other telehealth services, see TrimRx vs Mochi.
By the Gym Floor Guide Editorial Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.