--- title: "Oral Wegovy Side Effects: What the Wegovy Pill Trial Found" description: "Oral Wegovy side effects from the 64-week OASIS 4 trial and the label: how often nausea and vomiting occurred, warning signs, and the morning pill routine." url: https://mingo.fit/blog/oral-wegovy-side-effects/ language: en published: 2026-11-05 --- # Oral Wegovy Side Effects: What the Wegovy Pill Trial Found The most common oral Wegovy side effects are digestive: nausea, vomiting, constipation, indigestion and diarrhea. In [OASIS 4](https://pubmed.ncbi.nlm.nih.gov/40934115/), the 64-week trial of the 25 mg Wegovy pill, 74.0% of adults on the tablet had a digestive adverse event, against 42.2% on placebo. The label's boxed warning is about thyroid C-cell tumors seen in rodents. Call your prescriber about severe or lasting stomach symptoms. Mingo is a GLP-1 tracker app; this guide summarizes the prescribing information and published trials and is not medical advice. This page is only about side effects. For how to take the pill, its approved uses and the trial's weight results, see our [Wegovy pill guide](https://mingo.fit/blog/wegovy-pill-use-benefits-side-effects-results/). ## Where these numbers come from Wegovy injection and Wegovy tablets share one US label. We used the version on [DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b), revised 06/2026. Its weight-reduction data for the tablets come from a single trial, called Study 7 in the label and OASIS 4 in the paper ([Wharton et al., NEJM 2025](https://pubmed.ncbi.nlm.nih.gov/40934115/)). The trial enrolled 307 adults with obesity, or with overweight plus at least one weight-related condition such as high blood pressure or abnormal blood fats. People with type 2 diabetes were excluded. Participants were randomized 2:1 to the 25 mg tablet or a placebo tablet once a day. The dose was stepped up to 25 mg over 12 weeks and then held for 52 weeks, followed by 7 weeks off the drug. Everyone also got advice on a reduced-calorie diet and physical activity (label sections 6.1 and 14.2). The label does not give the tablet its own adverse-reaction table. It says that with the 25 mg tablets, "the types and frequency of common adverse reactions were similar" to the injection's table (section 6.1). For rates symptom by symptom, we use the trial's results on [ClinicalTrials.gov (NCT05564117)](https://clinicaltrials.gov/study/NCT05564117?tab=results), posted by the sponsor, Novo Nordisk, in February 2026. Its nausea and vomiting rates match the ones Novo Nordisk [reports for OASIS 4](https://www.novonordisk.com/news-and-media/news-and-ir-materials/news-details.html?id=916447). When a number comes from the label or the paper instead, we say so. One difference between the label and the paper: for average weight change at week 64, the label reports -13.6% on the tablet and -2.4% on placebo (Table 11), while the paper reports -13.6% and -2.2%. The two documents report the placebo result slightly differently, so we give both. ## How common are oral Wegovy side effects? The table lists the non-serious adverse events reported by at least 5% of either group that were more common on the tablet than on placebo. They were recorded from week 0 to week 71 in the 204 adults who took the 25 mg tablet and the 102 who took placebo. An adverse event is anything that happened during treatment, whatever its cause, so not every case was caused by the drug. Source: [ClinicalTrials.gov NCT05564117 results](https://clinicaltrials.gov/study/NCT05564117?tab=results), posted February 25, 2026. The Wegovy label (revised 06/2026) has no tablet table to compare. | Side effect | Wegovy 25 mg tablet (N=204) | Placebo (N=102) | |---|---|---| | Nausea | 46.6% | 18.6% | | Vomiting | 30.9% | 5.9% | | Constipation | 20.1% | 9.8% | | Indigestion (dyspepsia) | 18.1% | 8.8% | | Diarrhea | 17.6% | 8.8% | | Headache | 11.8% | 8.8% | | Belching (eructation) | 10.3% | 2.0% | | Upper abdominal pain | 8.8% | 2.0% | | Acid reflux (GERD) | 7.8% | 4.9% | | Abdominal pain | 7.4% | 3.9% | | Fatigue | 7.4% | 1.0% | | Decreased appetite | 6.9% | 1.0% | | Hair loss (alopecia) | 6.4% | 2.0% | | Dizziness | 5.4% | 1.0% | The record also lists infections, which we kept apart. Urinary tract infections (6.4% vs 2.9%) and COVID-19 (20.1% vs 17.6%) were reported more often on the tablet. Colds, flu, bronchitis and sinus infections were reported more often on placebo. The label adds a few figures specific to the tablet: - **Stopping treatment.** 6.9% of people on the tablet and 5.9% on placebo stopped for good because of an adverse reaction. Digestive reactions were the most common reason, at 3.4% versus 2% (section 6.1). - **Severe digestive reactions.** Reported by 2% on the tablet and 0% on placebo (section 5.6). - **Gallstones.** Cholelithiasis was reported by 2.5% on the tablet and 1% on placebo (section 5.3). Serious adverse events of any kind were reported by 3.9% on the tablet and 8.8% on placebo, according to the ClinicalTrials.gov record. These are averages from one trial in adults without diabetes. They describe a group, not what will happen to you. ## When do oral Wegovy side effects start, and how long do they last? The label starts the tablet low and raises it every 30 days "to reduce the risk of gastrointestinal adverse reactions" (section 2.3). If a dose isn't tolerated during that build-up, the label says prescribers can consider delaying the next step. For the injection, the label says digestive reactions "were most frequently reported during dosage escalation" (section 6.1). It doesn't give a separate timeline for the tablets. The NEJM paper describes the tablet's digestive events as typically mild to moderate and transient, as summarized by the [American College of Cardiology](https://www.acc.org/Latest-in-Cardiology/Journal-Scans/2025/09/24/16/40/OASIS-4). Neither source says how many days or weeks a side effect lasts. The label also doesn't say how long side effects last after stopping. It does say that semaglutide stays in the blood for about 5 to 7 weeks after the last 25 mg tablet (section 12.3). So the best way to know your own pattern is to write it down. Rate your symptoms each day, note the day you start each new strength, and look back after a few weeks. A log shows whether nausea clusters after a dose step or fades as you stay on one dose, and it gives your prescriber something concrete to work with. ## How can you manage nausea, constipation, diarrhea and reflux? These tips come from the label's Medication Guide, [Cleveland Clinic](https://health.clevelandclinic.org/how-to-manage-glp-1-side-effects) and the [National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)](https://www.niddk.nih.gov/health-information/digestive-diseases/acid-reflux-ger-gerd-adults/eating-diet-nutrition). None of them replaces your prescriber's advice, and none involves changing your dose. ### Nausea and vomiting Cleveland Clinic suggests: - Eat smaller, more frequent meals, and eat slowly. - Limit foods that tend to set symptoms off: high-fat, spicy and sugary foods. - Try ginger or peppermint tea, which may ease an upset stomach. - Stay upright for 30 minutes after eating, since lying down can make GLP-1 nausea worse. - Ask your provider whether an anti-nausea medicine makes sense to keep on hand. Vomiting and diarrhea cost fluid. The Medication Guide says it's important to drink fluids to lower the chance of dehydration, and to tell your provider right away if nausea, vomiting or diarrhea doesn't go away. The label doesn't say what to do if you vomit soon after taking a tablet. It does say not to take more than one tablet a day, so ask your prescriber or pharmacist instead of taking another. ### Constipation Cleveland Clinic suggests staying hydrated, staying physically active, using a footstool on the toilet, and asking your provider about over-the-counter stool softeners or laxatives. Severe constipation, including fecal impaction, and intestinal blockage have been reported since approval (label section 6.2). The Medication Guide says to tell your provider about stomach problems that are severe or won't go away. ### Diarrhea Diarrhea can dehydrate you and upset your electrolyte balance, Cleveland Clinic notes. It suggests soft, bland, low-fiber foods, limiting caffeine, alcohol and dairy-based drinks, and asking your provider about a short-term anti-diarrheal medicine. ### Indigestion, reflux and belching Eating too much at once can bring on reflux, according to Cleveland Clinic, so smaller meals help here too. NIDDK suggests eating meals at least 3 hours before you lie down or go to bed. It lists high-fat foods, spicy foods, acidic foods such as citrus and tomatoes, coffee and other caffeine, alcohol, chocolate and mint as common triggers. While you sleep, NIDDK suggests raising your head 6 to 8 inches with a foam wedge or extra pillows ([NIDDK treatment page](https://www.niddk.nih.gov/health-information/digestive-diseases/acid-reflux-ger-gerd-adults/treatment)). We found no guideline advice specific to belching on semaglutide. Log it, and mention it at your next appointment if it bothers you. ## What are the serious side effects of the Wegovy pill? The label's boxed warning covers thyroid C-cell tumors. Semaglutide caused them in mice and rats, and it isn't known whether it causes them in people, including medullary thyroid carcinoma (MTC). Wegovy must not be used by anyone with a personal or family history of MTC or with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2), or after a serious allergic reaction to semaglutide or the tablet's ingredients (section 4). Section 5 of the label also warns about: - **Acute pancreatitis**, including fatal and non-fatal severe forms, seen with GLP-1 medicines including Wegovy. - **Gallbladder disease**, such as gallstones and gallbladder inflammation. Fast weight loss raises the risk, but the label says it was more common on Wegovy even after accounting for weight loss. - **Low blood sugar** in people with diabetes, especially with insulin or a sulfonylurea. The tablets have not been studied for weight reduction in people with type 2 diabetes (section 8.6). - **Acute kidney injury**, mostly in people who became dehydrated from nausea, vomiting or diarrhea. - **Severe digestive reactions.** The label doesn't recommend Wegovy for people with severe gastroparesis. - **Serious allergic reactions**, including anaphylaxis and angioedema. - **Diabetic retinopathy complications** in people with type 2 diabetes. - **A faster resting heart rate.** The label says findings with the tablets were similar to the injection. - **Food or liquid getting into the lungs** during anesthesia or deep sedation, because the stomach empties more slowly. The label also says to stop Wegovy at least 2 months before a planned pregnancy (section 8.3). ### Call your prescriber or get emergency care This list follows the label's Medication Guide. **Stop taking Wegovy and get medical help right away** if you have signs of a serious allergic reaction: swelling of the face, lips, tongue or throat, problems breathing or swallowing, severe rash or itching, fainting or feeling dizzy, or a very rapid heartbeat. **Stop taking Wegovy and call your prescriber right away** if you have severe pain in your stomach area that won't go away, with or without nausea or vomiting. It may be felt from the abdomen through to the back. **Call your prescriber** if you have: - Pain in the upper stomach, fever, yellowing of the skin or eyes, or clay-colored stools. - Nausea, vomiting or diarrhea that doesn't go away, or stomach problems that are severe. - A lump or swelling in the neck, hoarseness, trouble swallowing or shortness of breath. - A racing or pounding heart at rest that lasts several minutes. - Changes in vision, if you have type 2 diabetes. - Signs of low blood sugar, if you have type 2 diabetes, such as shakiness, sweating, confusion or a fast heartbeat. **If you took too much**, you may have severe nausea, severe vomiting and severe low blood sugar. Call your provider or Poison Help at 1-800-222-1222, or go to the nearest emergency room right away. **Before any surgery or procedure** with anesthesia or deep sedation, tell every provider involved that you take Wegovy. ## Why does the morning pill routine matter? The label is strict about how to take the tablet (section 2.1 and the Medication Guide): - Take one tablet in the morning on an empty stomach. - Swallow it whole with plain water, no more than 4 ounces. No other liquids. - Don't split, crush, chew or dissolve it. - Wait at least 30 minutes before eating, drinking or taking other medicines by mouth. - Don't take more than one tablet a day. The reason is absorption. Semaglutide from the tablet is absorbed mostly in the stomach, and only about 1% to 2% of each dose reaches the blood. In the label's studies, more was absorbed when people waited longer before eating, and a single dose taken with 50 mL of water was absorbed better than one taken with 240 mL (section 12.3). The routine controls how much medicine you get. The label doesn't say whether a mistimed tablet changes your side effects. Two more rules matter for reading your own pattern. If you miss a tablet, skip it and take the next one the following day (section 2.4). And the dose changes on a schedule: 1.5 mg for days 1 to 30, 4 mg for days 31 to 60, 9 mg for days 61 to 90, and 25 mg from day 91 (Table 2). Your prescriber may adjust that plan. A useful daily log records: - The time you took the tablet, and the time you first ate or drank. - Anything other than plain water you had with it. - Missed days. - The day you started each new strength. - How you felt, rated the same way each day. When a symptom flares, that record shows whether it lines up with a new dose step, a skipped tablet or a change in your routine, or with none of them. For the timing rules in more detail, see our [Wegovy pill guide](https://mingo.fit/blog/wegovy-pill-use-benefits-side-effects-results/). ## Is the Wegovy pill easier on the stomach than the injection? The label doesn't say so. It says the tablet's common reactions were similar in type and frequency to the injection's (section 6.1). The injection's numbers come from three 68-week trials of 2.4 mg weekly (Studies 2, 3 and 4 in the label, known as STEP 1, 2 and 3). In Table 3 of the label, nausea was reported by 44% on the injection and 16% on placebo, and vomiting by 24% and 6%. Severe digestive reactions were reported by 4.1% on the injection and 0.9% on placebo (section 5.6), and 6.8% versus 3.2% stopped because of an adverse reaction (section 6.1). These figures can't be lined up against the tablet's to rank the two. They come from different trials, with different people, lengths and placebo groups. The injection trials included people with type 2 diabetes (19% at baseline), and OASIS 4 excluded them. No head-to-head trial of the pill against the shot appears on the label. What the label does compare is blood levels. In people with obesity or overweight, the average steady-state level was about 77 nmol/L on the 25 mg tablet and about 75 nmol/L on the 2.4 mg injection. In people without type 2 diabetes, levels varied more from person to person on the tablet: 90% fell between 27 and 186 nmol/L, against 51 and 110 nmol/L on the injection (sections 8.6 and 12.3). For the injection's side effects in full, see [Wegovy side effects](https://mingo.fit/blog/wegovy-side-effects/). For semaglutide across its brands, see [semaglutide side effects](https://mingo.fit/blog/semaglutide-side-effects/). ## Keeping a side-effect log in Mingo Mingo is our app, a GLP-1 tracker for iPhone and Android. It lists the Wegovy pill with its four strengths, 1.5, 4, 9 and 25 mg, and you log each tablet with its dose, the date and time you took it, and notes. A reminder comes on each dose day, with an optional heads-up before it and a nudge 2 hours later if the dose isn't logged. For side effects, Mingo has 18 built-in symptoms, each rated on a slider from 0 to 10. They include nausea, constipation, diarrhea, stomach pain, bloating, heartburn, sulfur burps, metallic taste, suppressed appetite, fatigue and hair loss. Vomiting isn't built in, so add it as your own symptom. Each symptom can be charted against your estimated medication level, which Mingo calculates from the doses you log and a half-life model. It's an estimate, not a blood test. The weight chart is colored by the dose you were on, with a marker at each new dose, so a new strength is easy to spot. You can log meals by photo, voice, text or barcode, with daily protein, fiber and water targets. Meal photos, voice notes and descriptions are sent to Mingo's server to estimate nutrients; the log itself stays on your phone, and there's no account. Before an appointment, Mingo makes a PDF report of your doses, estimated levels, weight, food and side effects for any period. Mingo Pro is needed to keep logging after your first entries; reminders, the medication-level chart and the PDF report stay free. More on the [Wegovy tracker](https://mingo.fit/wegovy-tracker/) page. ## Sources - Wegovy (semaglutide) injection and Wegovy (semaglutide) tablets, US prescribing information and Medication Guide, revised 06/2026. [DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b). - Wharton S, Lingvay I, Bogdanski P, et al. Oral semaglutide at a dose of 25 mg in adults with overweight or obesity (OASIS 4). N Engl J Med. 2025;393(11):1077-1087. [PubMed 40934115](https://pubmed.ncbi.nlm.nih.gov/40934115/). - Efficacy and safety of oral semaglutide 25 mg once daily in adults with overweight or obesity (OASIS 4), results posted February 25, 2026. [ClinicalTrials.gov NCT05564117](https://clinicaltrials.gov/study/NCT05564117?tab=results). - Novo Nordisk. Novo Nordisk presents four new analyses on oral semaglutide 25 mg at ObesityWeek 2025, November 5, 2025. [Press release](https://www.novonordisk.com/news-and-media/news-and-ir-materials/news-details.html?id=916447). - American College of Cardiology. OASIS 4 journal scan, September 24, 2025. [ACC](https://www.acc.org/Latest-in-Cardiology/Journal-Scans/2025/09/24/16/40/OASIS-4). - Cleveland Clinic. How to manage the digestive side effects of GLP-1 medications. [Cleveland Clinic](https://health.clevelandclinic.org/how-to-manage-glp-1-side-effects). - NIDDK. Eating, diet and nutrition for GER and GERD, and Treatment for GER and GERD. [Eating and diet](https://www.niddk.nih.gov/health-information/digestive-diseases/acid-reflux-ger-gerd-adults/eating-diet-nutrition), [treatment](https://www.niddk.nih.gov/health-information/digestive-diseases/acid-reflux-ger-gerd-adults/treatment). ## Frequently asked questions ### Does the Wegovy pill cause hair loss? In the OASIS 4 trial, hair loss was reported more often on the 25 mg tablet than on placebo (the rates are in the table above). The label links hair loss with the Wegovy injection to weight reduction, and in the injection trials it was reported more often by women than by men. If you notice more shedding, note when it started and mention it to your prescriber. ### Can the Wegovy pill cause tingling or burning skin? Yes, it can. The label calls this dysesthesia, which covers tingling, burning, painful or sensitive skin, and says 5% of people on the 25 mg tablet reported it in the trial, against none on placebo. With Wegovy, it became more common as the dose and blood levels went up. Tell your prescriber if it happens to you. ### Can I breastfeed while taking the Wegovy pill? The label says breastfeeding is not recommended while you take Wegovy tablets. The tablets contain an absorption enhancer called SNAC, and SNAC or its breakdown products have been found in breast milk and could build up in a baby. The injection does not contain SNAC, so talk to your prescriber about the options. ### Does the Wegovy pill affect thyroid medicine? It can. In a drug interaction study, total thyroxine exposure rose by 33% when levothyroxine was taken with oral semaglutide. The label tells prescribers to monitor medicines taken by mouth with Wegovy. Since the Wegovy tablet has its own timing rules, ask your prescriber or pharmacist how to fit your thyroid medicine around it. ### What if I can't tolerate the 25 mg Wegovy pill? The label gives your prescriber options. If the 25 mg tablet isn't tolerated, it says to consider switching to the Wegovy 1.7 mg weekly injection. Don't change, split or stop your dose on your own, and bring your symptom log to the appointment.