Semaglutide vs Tirzepatide: Key Differences & Comparison

<section class="ondra-article-page"> <div class="ondra-article-hero"> <div class="ondra-article-container"> <div class="ondra-article-meta-row"> <span class="ondra-meta-pill">⏱ 9 min read</span> <span class="ondra-meta-pill">🏷 GLP-1 Treatment</span></div> <h1 class="ondra-article-title">Semaglutide vs Tirzepatide: Which GLP-1 Is Right for You?</h1> <p class="ondra-article-intro">Both are weekly injectable GLP-1 medications. Both can meaningfully reduce appetite and support weight loss. But they work differently, produce different results in clinical trials, and aren't priced the same. Here's a clear, honest comparison to help you and your provider make the right call.</p> </div> </div> <div class="ondra-article-container ondra-article-body"> <div class="ondra-article-layout" id="ondraArticleLayout"> <div class="ondra-article-main" id="ondraArticleMain"> <a href="/blog" class="ondra-back-link">← Back to all articles</a>  <div class="ondra-takeaways-card"> <h2 class="ondra-card-heading">Key takeaways</h2> <div class="ondra-takeaway-item"> <span class="ondra-check">✔</span> <p>Semaglutide targets <strong>one</strong> appetite pathway (GLP-1). Tirzepatide targets <strong>two</strong> (GLP-1 and GIP).</p> </div> <div class="ondra-takeaway-item"> <span class="ondra-check">✔</span> <p>In separate trials, tirzepatide produced about <strong>20–21% average weight loss</strong>, compared with about <strong>15% for semaglutide</strong>.</p> </div> <div class="ondra-takeaway-item"> <span class="ondra-check">✔</span> <p>Side effects overlap heavily. Semaglutide leans toward nausea and constipation; tirzepatide leans toward diarrhea, sometimes with less nausea.</p> </div> <div class="ondra-takeaway-item"> <span class="ondra-check">✔</span> <p>At Ondra Health, compounded semaglutide starts at <strong>$113/month</strong> and compounded tirzepatide starts at <strong>$183/month</strong> on a quarterly plan.</p> </div> <div class="ondra-takeaway-item"> <span class="ondra-check">✔</span> <p>The "right" medication depends on your health history, tolerance, goals, and budget — not on which one performs better in trials.</p> </div> </div>  <div class="ondra-section"> <h2>Quick answer: which one wins?</h2> <p>If we're only looking at average weight loss in clinical trials, <strong>tirzepatide tends to outperform semaglutide</strong> — about 20–21% body weight loss versus about 15%, in separate studies. Tirzepatide also tends to produce faster early results.</p> <p>But "wins on paper" isn't the same as "right for you." Semaglutide has been studied longer, costs less, and is well-tolerated by many patients. Some people respond better to semaglutide. Some can't tolerate the GI side effects of either. The honest answer: a licensed provider should match the medication to <em>your</em> body, not the other way around.</p> </div>  <div class="ondra-section"> <h2>How each medication works</h2> <div class="ondra-info-card"> <p class="ondra-info-title">Semaglutide — single-pathway GLP-1</p> <p>Semaglutide is a GLP-1 receptor agonist. It mimics the natural GLP-1 hormone your gut releases after eating, which signals fullness, slows digestion, and helps regulate blood sugar. The brand-name versions are Wegovy® (for weight loss) and Ozempic® (for type 2 diabetes).</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Tirzepatide — dual-pathway GLP-1 + GIP</p> <p>Tirzepatide acts on both GLP-1 and a second hormone receptor called GIP (glucose-dependent insulinotropic polypeptide). The dual action appears to enhance appetite suppression and metabolic effects beyond what GLP-1 does alone. The brand-name versions are Zepbound® (for weight loss) and Mounjaro® (for type 2 diabetes).</p> </div> <p>Both medications are taken as a once-weekly subcutaneous injection. Both start at a low dose and titrate up over months to give your body time to adjust.</p> </div>  <div class="ondra-section"> <h2>Side-by-side comparison</h2> <div class="ondra-compare-table" role="table" aria-label="Semaglutide vs Tirzepatide comparison"> <div class="ondra-compare-row ondra-compare-header" role="row"> <div role="columnheader">Feature</div> <div role="columnheader">Semaglutide</div> <div role="columnheader">Tirzepatide</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Mechanism</div> <div role="cell" data-label="Semaglutide">GLP-1 only</div> <div role="cell" data-label="Tirzepatide">GLP-1 + GIP (dual)</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Avg weight loss in trials</div> <div role="cell" data-label="Semaglutide">~15% (STEP trials)</div> <div role="cell" data-label="Tirzepatide">~20–21% (SURMOUNT trials)</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Brand names</div> <div role="cell" data-label="Semaglutide">Wegovy®, Ozempic®</div> <div role="cell" data-label="Tirzepatide">Zepbound®, Mounjaro®</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Administration</div> <div role="cell" data-label="Semaglutide">Weekly injection</div> <div role="cell" data-label="Tirzepatide">Weekly injection</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Common side effects</div> <div role="cell" data-label="Semaglutide">Nausea, constipation</div> <div role="cell" data-label="Tirzepatide">Diarrhea, sometimes less nausea</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Onset of results</div> <div role="cell" data-label="Semaglutide">Gradual, over months</div> <div role="cell" data-label="Tirzepatide">Often faster in first 4–8 weeks</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Ondra Health price</div> <div role="cell" data-label="Semaglutide">From $113/mo (quarterly)</div> <div role="cell" data-label="Tirzepatide">From $183/mo (quarterly)</div> </div> <div class="ondra-compare-row" role="row"> <div class="ondra-feature-cell" role="cell">Track record</div> <div role="cell" data-label="Semaglutide">Longer real-world history</div> <div role="cell" data-label="Tirzepatide">Newer, fast-growing evidence base</div> </div> </div> <p class="ondra-table-note">Trial averages are from separate clinical studies and don't predict individual results. Your outcome depends on dose, adherence, lifestyle, and biology.</p> </div>  <div class="ondra-section"> <h2>What the research actually says</h2> <p>Most people compare these two medications using two landmark trial programs:</p> <div class="ondra-info-card"> <p class="ondra-info-title">STEP trials (semaglutide)</p> <p>Published in <em>The New England Journal of Medicine</em> (2021), the STEP-1 trial showed adults on semaglutide 2.4mg lost an average of 14.9% of body weight over 68 weeks, compared to 2.4% on placebo.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">SURMOUNT trials (tirzepatide)</p> <p>The SURMOUNT-1 trial (NEJM, 2022) found adults on the maximum tirzepatide dose lost about 20.9% of body weight over 72 weeks. Higher doses pushed averages closer to 22%.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Head-to-head: SURMOUNT-5</p> <p>The first direct comparison trial (published 2024) showed tirzepatide produced significantly greater weight loss than semaglutide — about 20% vs about 14% — over 72 weeks.</p> </div> <p>So in head-to-head data, tirzepatide does come out ahead. But individual response varies widely. Some people lose well over 25% of body weight on semaglutide. Others tolerate tirzepatide better but plateau earlier.</p> </div>  <div class="ondra-section"> <h2>Side effects: what to actually expect</h2> <p>Both medications work through your gut, so most side effects are gastrointestinal. The list overlaps almost completely, but the <em>frequency</em> of each can differ.</p> <div class="ondra-info-card"> <p class="ondra-info-title">Most common (both medications)</p> <p>Nausea (especially during dose increases), reduced appetite, constipation, diarrhea, mild fatigue, headache, and reactions at the injection site. Most are mild and fade as your body adjusts.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Slight differences</p> <p>In clinical experience, semaglutide tends to cause more nausea and constipation. Tirzepatide more commonly causes diarrhea, sometimes with milder nausea — possibly because GIP receptor activity may slightly offset GLP-1-related nausea. Individual responses vary.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Less common — flag to your provider</p> <p>Vomiting, severe reflux, heart rate changes, gallbladder symptoms, hair thinning (usually temporary), and mood changes. Severe or persistent abdominal pain warrants prompt medical attention.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Important warnings</p> <p>Both medications carry a boxed warning regarding thyroid C-cell tumors and should not be used by people with a personal or family history of medullary thyroid carcinoma or MEN2 syndrome. Other contraindications include a history of pancreatitis, severe gallbladder disease, or certain kidney conditions. Your provider will review your full history before prescribing.</p> </div> </div>  <div class="ondra-section"> <h2>Cost comparison</h2> <p>Brand-name GLP-1s are expensive. Without insurance, list prices typically run:</p> <div class="ondra-info-card"> <p class="ondra-info-title">Brand-name (cash price, approximate)</p> <p>Wegovy® and Ozempic®: roughly $1,000–$1,400/month. Zepbound® and Mounjaro®: roughly $1,000–$1,300/month. Manufacturer savings programs and direct-to-consumer cash options have lowered some of these in 2025–2026, but prices still typically run several hundred dollars per month.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Compounded (Ondra Health)</p> <p>Compounded semaglutide: from $113/month on a quarterly plan ($339 billed quarterly). Compounded tirzepatide: from $183/month on a quarterly plan ($549 billed quarterly). Same price across all dose levels. Free shipping. New users can apply code <strong>Ondra50</strong> for first-month savings.</p> </div> <p>Compounded medications are prepared by state-licensed 503A or 503B pharmacies and are not FDA-approved. They contain the same active ingredient as their brand-name counterparts. The FDA does not review compounded medications for safety, effectiveness, or manufacturing quality. <a href="/compounded-semaglutide">Read more about compounded semaglutide</a> or <a href="/compounded-tirzepatide">compounded tirzepatide</a>.</p> </div>  <div class="ondra-section"> <h2>How to choose between them</h2> <p>Most clinicians don't think in terms of "which medication is best" — they think in terms of "which medication fits this person." Things to consider:</p> <div class="ondra-info-card"> <p class="ondra-info-title">Start with semaglutide if…</p> <p>You're cost-sensitive, you're new to GLP-1s and want a longer-studied option, or you have a history of significant diarrhea or IBS that might be worsened by tirzepatide.</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Consider tirzepatide if…</p> <p>You have a higher BMI and a more aggressive weight loss goal, you've previously tried semaglutide and plateaued, you've struggled with nausea on GLP-1s, or you have type 2 diabetes (in which case the brand-name Mounjaro® is FDA-approved).</p> </div> <div class="ondra-info-card"> <p class="ondra-info-title">Either is reasonable if…</p> <p>You're starting your weight loss journey for the first time, your BMI is in the lower obesity range, and you have no strong contraindications. In that case, cost and provider recommendation usually drive the choice.</p> </div> <p>This decision is best made <em>with</em> a licensed provider who can review your medical history, current medications, and goals.</p> </div>  <div class="ondra-section"> <h2>Can you switch from one to the other?</h2> <p>Yes — switching between GLP-1 medications is common. People switch because of side effects, cost, weight loss plateau, or supply changes. Any switch should be supervised by your provider, who will determine an appropriate starting dose for the new medication based on your treatment history. You typically don't restart from the lowest possible dose if you've been tolerating an equivalent dose of the other medication, but the exact transition is individualized.</p> </div>  <div class="ondra-section"> <h2>Who qualifies for treatment?</h2> <p>FDA labeling for the brand-name versions of both medications generally indicates use for adults with:</p> <div class="ondra-info-card"> <p class="ondra-info-title">BMI of 30 or higher (obesity)</p> <p>Or BMI of 27 or higher with at least one weight-related condition such as high blood pressure, type 2 diabetes, high cholesterol, or obstructive sleep apnea.</p> </div> <p>At Ondra Health, eligibility is determined by a licensed provider after reviewing your intake. Not everyone qualifies, and some medical conditions (history of medullary thyroid cancer, MEN2 syndrome, severe pancreatitis, pregnancy) may rule out treatment. <a href="https://intake.ondra.health/start-online-visit/glp1">Start your intake</a> to see what your provider recommends.</p> </div>  <div class="ondra-section"> <h2>The bottom line</h2> <p>Tirzepatide tends to produce more weight loss in clinical trials. Semaglutide costs less and has a longer real-world track record. Both work. Both have similar side-effect profiles with slight differences in which symptoms predominate.</p> <p>The right choice isn't the one that performs best on paper — it's the one your body tolerates, your provider recommends, and your budget supports for long enough to see meaningful results. Weight loss with GLP-1s is a long game; the medication you'll actually stay on is the one that works for you.</p> </div>  <div class="ondra-section"> <h2>Frequently asked questions</h2> <div class="ondra-faq-item"> <h3>What is the main difference between semaglutide and tirzepatide?</h3> <p>Semaglutide acts on a single appetite pathway (GLP-1), while tirzepatide acts on two pathways (GLP-1 and GIP). Both are weekly self-injections that reduce appetite, but tirzepatide's dual mechanism tends to produce greater weight loss in clinical trials.</p> </div> <div class="ondra-faq-item"> <h3>Which is better for weight loss, semaglutide or tirzepatide?</h3> <p>In separate clinical trials, tirzepatide showed an average weight loss of about 20–21% (SURMOUNT trials) compared to about 15% with semaglutide (STEP trials). Tirzepatide tends to produce more weight loss, but the right choice depends on your medical history, side-effect tolerance, goals, and budget.</p> </div> <div class="ondra-faq-item"> <h3>Which medication has fewer side effects?</h3> <p>Both medications cause similar gastrointestinal side effects (nausea, constipation, diarrhea, reflux). Side-effect profiles can differ slightly: semaglutide tends to cause more nausea and constipation, while tirzepatide more commonly causes diarrhea. Most side effects are mild and improve as your body adjusts to the medication.</p> </div> <div class="ondra-faq-item"> <h3>How much do compounded semaglutide and tirzepatide cost at Ondra Health?</h3> <p>At Ondra Health, compounded semaglutide starts at $113/month on a quarterly plan ($339 billed quarterly), and compounded tirzepatide starts at $183/month on a quarterly plan ($549 billed quarterly). New patients can use code Ondra50 for first-month savings. Prices are the same across all dose levels.</p> </div> <div class="ondra-faq-item"> <h3>Can I switch from semaglutide to tirzepatide?</h3> <p>Yes. Many patients switch between GLP-1 medications based on results, side effects, or cost. Any switch should be guided by a licensed provider, who will adjust your starting dose and titration plan to match your treatment history.</p> </div> <div class="ondra-faq-item"> <h3>Are compounded semaglutide and tirzepatide the same as Wegovy, Ozempic, or Zepbound?</h3> <p>No. Compounded medications are prepared by state-licensed 503A or 503B pharmacies for individual patients and are not FDA-approved. They contain the same active ingredient as their brand-name counterparts but are not reviewed by the FDA for safety, effectiveness, or manufacturing quality.</p> </div> </div> <p class="ondra-disclaimer">† This article is for educational purposes only and does not constitute medical advice. Compounded medications are not FDA-approved and are not reviewed by the FDA for safety, effectiveness, or manufacturing quality. Always consult a qualified healthcare provider before starting, stopping, or changing any treatment plan. Statistics on weight loss are drawn from published clinical trials and represent group averages — individual results vary. Brand names (Wegovy®, Ozempic®, Zepbound®, Mounjaro®) are referenced for informational purposes only and remain the property of their respective trademark holders. Ondra Health is not affiliated with Novo Nordisk or Eli Lilly.</p> </div>  <aside class="ondra-article-sidebar" id="ondraSidebarCol"> <div class="ondra-sidebar-track" id="ondraSidebarTrack"> <div class="ondra-sidebar-card-wrap" id="ondraSidebarWrap"> <div class="ondra-sidebar-card" id="ondraSidebarCard"> <div class="ondra-sidebar-top"> <p class="ondra-sidebar-eyebrow">ONDRA HEALTH</p> <h3>Find your fit — semaglutide or tirzepatide</h3> </div> <div class="ondra-sidebar-bottom"> <div class="ondra-sidebar-item"><span>✔</span><p>3-minute clinician-reviewed intake</p></div> <div class="ondra-sidebar-item"><span>✔</span><p>Compounded semaglutide from $113/mo</p></div> <div class="ondra-sidebar-item"><span>✔</span><p>Compounded tirzepatide from $183/mo</p></div> <div class="ondra-sidebar-item"><span>✔</span><p>Free discreet shipping, ongoing support</p></div> <a href="https://intake.ondra.health/start-online-visit/glp1" class="ondra-sidebar-button" target="_blank" rel="noopener noreferrer"> Start your intake <span aria-hidden="true">→</span> </a> <p class="ondra-sidebar-note">Only charged if a provider approves your treatment.</p> </div> </div> </div> </div> </aside> </div> </div> </section>