--- title: "Ozempic Side Effects: Common, Serious, How Long (2026) | GLPMate" url: https://glpmate.me/blog/ozempic-side-effects-2026 language: en description: "Ozempic side effects from the current US label: how often nausea and other stomach effects occur, how long they last, serious warnings and when to call." updated: 2026-10-14 --- [Blog](/blog) # Ozempic side effects: what the label reports, how long they last and when to get help By [the GLPMate team](/editorial-policy) · Based on FDA prescribing information & peer-reviewed sources · Updated 2026-10-14 · 6 min read Quick answer In Ozempic's placebo-controlled type 2 diabetes trials, nausea affected 15.8% (0.5 mg) and 20.3% (1 mg) of people vs 6.1% on placebo, followed by vomiting, diarrhea, belly pain and constipation. Most stomach side effects appear during dose increases. Rarer but serious risks include pancreatitis, gallbladder problems, eye complications and low blood sugar with insulin or a sulfonylurea. ## What are the most common Ozempic side effects? Ozempic (semaglutide) is a once-weekly injection approved in the US for adults with **type 2 diabetes**: to improve blood sugar, to lower the risk of major heart events in people with heart disease, and to reduce the risk of kidney decline in people with chronic kidney disease. Its side-effect numbers therefore come from people with diabetes, mostly in their 50s, rather than from weight-loss trials. The label’s main table pools two placebo-controlled trials with 521 people on Ozempic for an average of about 33 weeks. These reactions affected at least 5% of people and were more common than on placebo: Side effect | Placebo | Ozempic 0.5 mg | Ozempic 1 mg Nausea | 6.1% | 15.8% | 20.3% Vomiting | 2.3% | 5.0% | 9.2% Diarrhea | 1.9% | 8.5% | 8.8% Abdominal pain | 4.6% | 7.3% | 5.7% Constipation | 1.5% | 5.0% | 3.1% Less common digestive effects included indigestion, burping, gas, reflux and gastritis. Fatigue, a change in taste and dizziness were also linked to Ozempic, as was a small average rise in resting heart rate of 2 to 3 beats per minute. Injection-site redness or discomfort was rare (0.2%). **~1 in 3** People with any digestive side effect in Ozempic's placebo-controlled diabetes trials: 32.7% at 0.5 mg and 36.4% at 1 mg, vs 15.3% on placebo (US label). Most reports came during dose escalation, and 3.1–3.8% stopped Ozempic because of them, vs 0.4% on placebo. The 2 mg dose was added later. In a 40-week trial comparing it with 1 mg, digestive side effects were a little more common at 2 mg (34% vs 30.8%), and no new safety signals appeared. If you use Ozempic off-label for weight, the doses and trial populations differ, so our [guide to Wegovy side effects](/blog/wegovy-side-effects-2026) may be closer to your situation. ## When do Ozempic side effects start, and how long do they last? Ozempic starts at **0.25 mg once a week for 4 weeks**, then moves to 0.5 mg. If more blood-sugar lowering is needed, your prescriber can step up to 1 mg and then 2 mg, each after at least 4 weeks on the current dose. The slow start exists to reduce stomach side effects. The label says most nausea, vomiting and diarrhea happened **during dose escalation**. So the first weeks, and the week or two after each step up, are when symptoms are most likely, and many people find they settle once the dose is stable. The Ozempic label doesn’t give episode lengths. As a rough guide only, in weight trials of the higher 2.4 mg semaglutide dose a typical nausea episode lasted about 8 days, while constipation lasted longer (median 47 days). Our [week-by-week guide to GLP-1 side effects](/learn/glp-1-side-effects-week-by-week) shows the usual pattern. If a step feels hard to tolerate, tell your prescriber before the next increase. Don’t skip, split or double doses on your own. ## What are the serious side effects of Ozempic? These are uncommon, but knowing the warning signs matters more than knowing the percentages. ### Boxed warning: thyroid C-cell tumors Semaglutide caused thyroid C-cell tumors in mice and rats; whether it does in humans is unknown. Ozempic must not be used if you or a family member have had medullary thyroid carcinoma (MTC), or if you have MEN 2. Report a lump in your neck, trouble swallowing, shortness of breath or hoarseness that won’t go away. ### Pancreatitis In diabetes trials, confirmed acute pancreatitis occurred at 0.3 cases per 100 patient-years on Ozempic vs 0.2 on comparators. The sign to know: severe stomach pain that won’t go away, sometimes spreading to your back, with or without vomiting. The Medication Guide says to stop Ozempic and call your provider right away. ### Gallbladder problems Gallstones were reported in 1.5% (0.5 mg) and 0.4% (1 mg) of people vs none on placebo. Watch for upper stomach pain, fever, yellowing of the skin or eyes, or clay-colored stools. ### Low blood sugar with insulin or a sulfonylurea Ozempic on its own rarely causes lows, but the risk rises when it’s combined with insulin or a sulfonylurea. Added to basal insulin, documented symptomatic lows (70 mg/dL or below) occurred in 16.7% (0.5 mg) and 29.8% (1 mg) vs 15.2% on placebo. Your prescriber may lower those medicines when you start. Shakiness, sweating, confusion, hunger and a fast heartbeat are typical signs. ### Diabetic eye complications In the 2-year SUSTAIN-6 trial, retinopathy complications occurred in 3.0% on Ozempic vs 1.8% on placebo. The gap was larger in people who already had retinopathy (8.2% vs 5.2%) than in those who didn’t (0.7% vs 0.4%). Rapid blood-sugar improvement can temporarily worsen retinopathy, so keep your eye exams up to date. ### Dehydration, kidneys and severe stomach problems Acute kidney injury, sometimes needing dialysis, has been reported after use, mostly in people dehydrated by vomiting or diarrhea. Severe digestive reactions were reported in 0.4–0.8% of trial participants vs 0% on placebo, and Ozempic isn’t recommended in severe gastroparesis. Post-approval reports also include bowel blockage (ileus) and severe constipation. ### Allergic reactions and anesthesia Serious allergic reactions, including anaphylaxis and swelling of the face or throat, have been reported. Because Ozempic slows stomach emptying, rare cases of food entering the lungs during anesthesia or deep sedation have been reported with GLP-1 medicines, so tell every care team about Ozempic before a procedure. Post-approval reports also list hair loss, headache and altered skin sensation; how often these happen can’t be reliably estimated. ## What helps with Ozempic side effects? The fixes are the same as for other GLP-1 medicines, and we cover them in depth elsewhere: - **Nausea:** smaller, lower-fat meals, eating slowly and stopping at the first sign of fullness. See our [guide to GLP-1 nausea relief](/blog/glp-1-nausea-relief-2026). - **Constipation or diarrhea:** steady fluids, fiber increased gradually and daily movement; ask a pharmacist before laxatives. Our [constipation guide](/blog/glp-1-constipation-relief-2026) has the details. - **Eating well on less appetite:** protein first, then vegetables, in small plates. See [what to eat on a GLP-1](/blog/what-to-eat-on-glp-1-2026). - **Alcohol:** it can worsen nausea and, with insulin or a sulfonylurea, raise the risk of lows. Read [alcohol and GLP-1 medicines](/blog/alcohol-and-glp-1-2026) first. - **Hair shedding:** usually linked to weight loss rather than the drug itself; our [hair loss guide](/blog/glp-1-hair-loss-2026) explains why. ## When should you call your doctor about Ozempic side effects? Get urgent care for: - Severe stomach pain that won’t go away, with or without vomiting - Vomiting or diarrhea that stops you keeping fluids down, or very little urine - Swelling of the face, lips, tongue or throat, or trouble breathing - Upper stomach pain with fever or yellowing skin or eyes - A low blood sugar that doesn’t respond to treatment, or confusion Book a regular appointment for side effects that last weeks at a stable dose, any change in vision, a neck lump or persistent hoarseness, or planned surgery. If you’re planning a pregnancy, the label advises stopping Ozempic at least 2 months beforehand, so plan that with your prescriber. ## What should you log while taking Ozempic? Notes make appointments faster and help your prescriber decide whether to hold a dose step longer. Useful items: - Dose, date and injection site - Each symptom with a severity rating and the day it started relative to your injection - Meals, fluids and bowel movements on rough days - Blood sugar readings, especially any lows if you also use insulin or a sulfonylurea - Eye exam dates and any vision changes GLPMate’s [Ozempic tracker](/ozempic-tracker-app) keeps your doses, reminders and injection sites in one place, and the [side-effect log](/glp-1-side-effect-tracker) records severity next to your dose history; the doctor report turns it into a PDF for your appointment. This article is educational only and not medical advice. Talk to your doctor about any side effect that worries you. FAQ ## FAQ ### What are the most common side effects of Ozempic? Stomach and gut symptoms. In the label's placebo-controlled diabetes trials, nausea affected 15.8% (0.5 mg) and 20.3% (1 mg) of people vs 6.1% on placebo, followed by vomiting, diarrhea, abdominal pain and constipation. Fatigue, taste changes and dizziness were also reported less often. ### How long do Ozempic side effects last? The label says most nausea, vomiting and diarrhea happened during dose escalation, so the first weeks and the weeks after each step up are the usual peak. For many people symptoms ease once the dose is stable. If they last for weeks at the same dose, or stop you eating or drinking, tell your prescriber. ### Does Ozempic cause thyroid cancer? Semaglutide caused thyroid C-cell tumors in rodents, and it is unknown whether it does so in humans, which is why Ozempic carries a boxed warning. It must not be used if you or a family member have had medullary thyroid carcinoma, or if you have MEN 2. Report a neck lump, trouble swallowing or lasting hoarseness to your doctor. ### Can Ozempic affect your eyes? In the 2-year SUSTAIN-6 trial, diabetic retinopathy complications occurred in 3.0% of people on Ozempic vs 1.8% on placebo, with a larger difference in people who already had retinopathy. Rapid improvement in blood sugar can temporarily worsen it. Keep up regular eye exams and report any change in vision. ## Sources 1. OZEMPIC (semaglutide) injection, US Prescribing Information and Medication Guide, Novo Nordisk — DailyMed version effective June 2026 — indications; 0.25 → 0.5 → 1 → 2 mg dosing; Table 1 (nausea 15.8%/20.3% vs 6.1%, vomiting, diarrhea, abdominal pain, constipation); GI reactions 32.7%/36.4% vs 15.3% and mostly during escalation; GI discontinuation 3.1%/3.8% vs 0.4%; 2 mg vs 1 mg GI 34% vs 30.8%; hypoglycemia tables; boxed warning; pancreatitis, retinopathy, kidney, severe GI, allergy, gallbladder and anesthesia warnings; heart rate +2–3 bpm; postmarketing reports; stop at least 2 months before a planned pregnancy 2. Marso et al., NEJM 2016 (SUSTAIN-6) — semaglutide 0.5 or 1 mg vs placebo for 104 weeks in 3,297 people with type 2 diabetes — fewer major cardiovascular events but more retinopathy complications (HR 1.76); more discontinuations for adverse events, mainly gastrointestinal 3. Wharton et al., Diabetes Obes Metab 2022 — GI tolerability of semaglutide 2.4 mg (pooled STEP 1–3) — higher-dose weight-management data used only as a rough guide: median nausea episode 8 days, constipation 47 days; GI events mostly mild to moderate and clustered around dose escalation Sources checked: October 14, 2026 This article is educational and is not medical advice, diagnosis or treatment. Medication decisions — including dose changes and what to do after a missed dose — belong with your prescriber. If you experience severe symptoms, seek medical care. ## Keep reading [Ozempic tracker app ](/ozempic-tracker-app)[Log side effects and severity ](/glp-1-side-effect-tracker)[GLP-1 nausea: what helps ](/blog/glp-1-nausea-relief-2026) ## Start your GLP-1 journey with a companion that listens. Free to start. iOS & Android. [ Download on the **App Store** ](https://glpmate.go.link?adj_t=22klhq12&adj_campaign=blog-ozempic-side-effects-2026&adj_redirect_android=https%3A%2F%2Fapps.apple.com%2Fapp%2Fid6788548235&adj_redirect_macos=https%3A%2F%2Fapps.apple.com%2Fapp%2Fid6788548235&adj_redirect_windows=https%3A%2F%2Fapps.apple.com%2Fapp%2Fid6788548235) [ GET IT ON **Google Play** ](https://glpmate.go.link?adj_t=22klhq12&adj_campaign=blog-ozempic-side-effects-2026&adj_redirect_ios=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dapp.eleutheromania.glpmate&adj_redirect_macos=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dapp.eleutheromania.glpmate&adj_redirect_windows=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dapp.eleutheromania.glpmate)