For a couple of years, the semaglutide vs tirzepatide question was basically the whole conversation. Two weekly shots, pick one. Then in 2026 a third option showed up, the first GLP-1 you can actually swallow as a daily pill, and the decision got more interesting and a little more confusing.
I’ve been on the injectable side of this for two years. I started on semaglutide, switched to tirzepatide a few months in, and I’ve helped a lot of other women think through the same choice. I’m an ISSA-certified nutritionist and personal trainer, but the thing I can give you here that a spec sheet can’t is what these actually feel like to live with. So let me walk you through how semaglutide, tirzepatide, and the new oral pill compare on the things that matter: how they work, how much weight people lose, side effects, convenience, and cost.
Quick disclosure: a couple of the provider links below are affiliate links, so I may earn a small commission at no cost to you if you start with one. I only recommend providers I’d point a friend to.
The quick comparison, at a glance
| Semaglutide | Tirzepatide | Orforglipron (oral) | |
|---|---|---|---|
| Brand names | Wegovy, Ozempic | Zepbound, Mounjaro | Foundayo |
| How you take it | Weekly injection | Weekly injection | Daily pill, any time |
| How it works | GLP-1 | GIP + GLP-1 (dual) | GLP-1 (small molecule) |
| Average weight loss in trials | Around 15% | Around 21% | Around 11% |
| The main trade-off | Strong and well established | Highest average loss | Needle-free and most convenient |
These are averages from clinical trials, and individual results vary a lot. Compounded semaglutide and tirzepatide are available through telehealth providers. The new oral pill is currently branded only.
How they actually work
All three act on the same GLP-1 receptor, the one tied to appetite and fullness, but they aren’t identical.
Semaglutide is a single GLP-1 agonist. Tirzepatide is a dual agonist, meaning it works on two receptors, GIP and GLP-1, and that second mechanism is part of why it tends to edge out semaglutide on weight loss in head-to-head trial data. Orforglipron, the pill, is also a GLP-1 agonist, but it’s a small-molecule, non-peptide drug. That chemistry is the whole reason it can be a stable tablet you take any time of day, without the food-and-water timing rules that older oral options had to work around.
As a nutritionist, the way I explain it to clients is that all three turn down the appetite dial and slow how fast your stomach empties, so you feel full sooner and stay full longer. They just get there through slightly different doors.
Weight loss: what the trials show
Here are the numbers, framed the honest way, as averages, with the reminder that your result could land above or below them.
In the big trials, tirzepatide leads. At the top dose it produced around 21% average body weight loss (SURMOUNT-1). Semaglutide comes in around 15% (the STEP program). The new oral pill, orforglipron, produced about 11% average body weight loss at its highest approved dose over 72 weeks in the ATTAIN-1 trial published in the New England Journal of Medicine, roughly 25 pounds, compared with about 2% for placebo. For completeness, there’s also an oral semaglutide tablet that came out in late 2025, landing around 13 to 14%.
So on paper, the order is tirzepatide, then semaglutide, then the pill. That’s real, and I’m not going to pretend the pill matches the shots on raw efficacy. But averages don’t tell your story, which brings me to the part no trial captures.
(Add external dofollow links to the FDA Foundayo approval and the NEJM ATTAIN-1 trial here.)
What it’s actually like day to day
I started on semaglutide, and the appetite suppression was strong. Honestly, almost too strong at first. I had to be intentional about eating enough and drinking enough water, because when you’re barely hungry it’s easy to under-eat and under-hydrate, and that’s exactly when the side effects get worse.
A few months in, I switched to tirzepatide, and for me it felt different. The appetite suppression was gentler. I could eat more normally, which felt a lot more sustainable day to day. And here’s the part that surprised me: I kept losing at the same rate, with fewer side effects. That was my experience, not a promise for yours, and plenty of women find the exact opposite. But it’s a real example of why the drug that looks stronger on a chart isn’t automatically the better one for a given body.
I’ll also be straight with you: I haven’t taken the oral pill. It’s brand new, so I won’t pretend to tell you how it feels to live with. I’d rather wait and give you the honest version later than guess now.
Side effects: how they compare
Across all three, the side effects are mostly gastrointestinal. Nausea, constipation, and sometimes diarrhea, especially in the early weeks. They’re dose-dependent, tend to be worst during titration as you ramp up, and usually ease as your body adjusts.
The coach note that matters most here: a slow titration and staying on top of protein and hydration make a real difference in how rough or smooth those first weeks feel. All three also carry the same thyroid C-cell boxed warning and the same core cautions, so a personal or family history of medullary thyroid cancer or MEN2, and pregnancy, are conversations to have with your provider. If side effects are your main worry, I wrote a full guide on managing nausea and a week-by-week timeline of what to expect.
(Internal links to Post 6: nausea, and Post 7: side effects timeline.)
Convenience: shot vs pill
This is where the pill makes its case. It’s once daily, any time of day, no food or water restrictions, and no needle. For anyone who has been putting this off because of a genuine fear of injections, that’s a real barrier removed, and it’s not a small thing.
The trade-off is the one we already covered: on average, the pill delivers somewhat less weight loss than the shots. So the honest way to think about it is convenience versus efficacy. Neither answer is wrong. It depends on what matters more to you.
What they cost in 2026
Cost often makes the decision for people, so here’s the real picture, though prices move, so check current numbers before you commit.
The budget path is compounded semaglutide or tirzepatide through a telehealth provider. Compounded semaglutide runs somewhere around $169 to $199 a month depending on the provider and plan, with tirzepatide higher. Branded costs more out of pocket: Zepbound is roughly $299 to $449 a month through LillyDirect, and Wegovy is around $349 a month through the manufacturer’s cash program. The oral pill, Foundayo, starts at $149 a month for the lowest dose through LillyDirect and scales up as your dose increases, though it can be as low as $25 with commercial insurance or $50 for eligible Medicare Part D patients.
One thing I’ll always say plainly: compounded medications are not FDA-approved, and they aren’t reviewed by the FDA for safety, effectiveness, or quality. That’s a real part of the trade-off to weigh with your provider. I broke down the full cost comparison across every path in its own post.
(Internal link to Post 5: cost. Provider affiliate links and codes here, marked sponsored.)
So which is right for you?
There’s no single best GLP-1, only the right one for you, so here’s how I’d think it through.
If maximum average weight loss is what matters most to you, tirzepatide leads in the trial data. If you want the option with the longest track record and the most real-world history behind it, semaglutide is a strong, well-studied choice. And if needles are your dealbreaker and you’re willing to trade some efficacy for a daily pill you can take anytime, the new oral route is worth asking your provider about.
Whichever way you lean, the actual decision is your provider’s to make with you, based on your health history and your goals. If you’re leaning toward one of the shots, choosing a solid provider is your next step. And if the pill has your attention, I went deeper on exactly who it’s for in its own post.
(Internal links to Post 2: choosing a provider, and Post 19: the oral pill deep dive.)
The bottom line
The right GLP-1 isn’t the strongest one on a chart, it’s the one you and your provider choose together and that you can actually stick with. For me, that turned out to be tirzepatide after starting on semaglutide, and yours might be a different answer entirely. Start the conversation, track how you feel from day one, and give whatever you choose an honest chance to work.
This article is for education and is not medical advice. Compounded medications are not FDA-approved and are not reviewed by the FDA for safety, effectiveness, or quality. Weight-loss figures are trial averages and individual results vary. Always talk with a licensed provider before starting, stopping, or changing any medication. Last reviewed: August 2026.
