Yes, and diarrhea is only one of several stomach effects on Ozempic's label. In its placebo-controlled trials, about a third of people on Ozempic had a digestive side effect: 32.7% at 0.5 mg and 36.4% at 1 mg, against 15.3% on placebo [1]. These numbers are from the current US prescribing information, June 2026. Ozempic is approved for type 2 diabetes; for what it is and who it's for, see our Ozempic guide.
About a third of people on Ozempic had a digestive side effect in the trials
The label's table pools two placebo-controlled trials in adults with type 2 diabetes, about 260 people per group [1]. The table combines quantified common reactions and selected additional digestive effects; it does not list every possible reported condition.
| Effect | Placebo | Ozempic 0.5 mg | Ozempic 1 mg |
|---|---|---|---|
| Nausea | 6.1 | 15.8 | 20.3 |
| Diarrhea | 1.9 | 8.5 | 8.8 |
| Abdominal pain | 4.6 | 7.3 | 5.7 |
| Vomiting | 2.3 | 5.0 | 9.2 |
| Constipation | 1.5 | 5.0 | 3.1 |
| Indigestion (dyspepsia) | 1.9 | 3.5 | 2.7 |
| Burping (eructation) | 0 | 2.7 | 1.1 |
| Heartburn and reflux (GERD) | 0 | 1.9 | 1.5 |
| Gas (flatulence) | 0.8 | 0.4 | 1.5 |
| Gastritis | 0.8 | 0.8 | 0.4 |
| Any digestive side effect | 15.3 | 32.7 | 36.4 |
Ozempic prescribing information, DailyMed version 20, June 2026, Table 1 and §6.1. In a separate trial of 1 mg vs 2 mg, digestive side effects were reported by 34% at 2 mg against 30.8% at 1 mg.
Two patterns stand out. Diarrhea barely changes between 0.5 mg and 1 mg, while nausea and vomiting climb with the dose. Constipation runs the other way, more common at 0.5 mg than at 1 mg in these trials.
Semaglutide slows how fast the stomach empties
OZEMPIC delays gastric emptying.[1]
The label describes this as "a minor delay in gastric emptying in the early postprandial phase," meaning the first part of digestion after a meal [1]. This pharmacologic effect provides context for digestive symptoms but does not establish the mechanism of each reported reaction. The label adds one caveat: a separate study at the higher 2.4 mg dose found "no apparent effect" on the rate of gastric emptying. So slower emptying isn't the full explanation, and the label doesn't offer one for diarrhea specifically.
Most nausea, vomiting and diarrhea came while the dose was being raised
The majority of reports of nausea, vomiting, and/or diarrhea occurred during dose escalation.[1]
Ozempic starts at 0.25 mg a week and allows up to 2 mg. The label says its gradual start is there "to reduce the risk of gastrointestinal adverse reactions" [1]. Your prescriber decides the dose steps.
How long do these effects last? Ozempic's label doesn't give a number of days. You may see "about three days" quoted online; that figure doesn't come from Ozempic's label. If a stomach effect hasn't settled, tell your prescriber rather than waiting it out.
Constipation is less common than diarrhea at 1 mg, but it can become serious
Constipation affected 5.0% at 0.5 mg and 3.1% at 1 mg, against 1.5% on placebo [1]. Severity needs clinical assessment rather than reassurance from the average rate. After approval, semaglutide has been linked in reports to severe constipation including fecal impaction, and to ileus and intestinal obstruction, where the bowel stops moving or is blocked. These voluntary reports cannot reliably establish frequency or prove that semaglutide caused each event.
The label calls burping "eructation" and reports it in 2.7% at 0.5 mg
The label reports eructation, meaning burping, but does not specify a sulfur smell or establish its cause: 2.7% at 0.5 mg and 1.1% at 1 mg, with none on placebo. Heartburn and reflux (GERD) were 1.9% and 1.5%, also with none on placebo, and indigestion was 3.5% and 2.7% [1]. The label offers no remedies for these. Ask your prescriber or pharmacist what's appropriate for you before you add an over-the-counter medicine, since Ozempic may affect how other pills are absorbed.
Vomiting matters most because fluid loss can injure the kidneys
Vomiting affected 5.0% at 0.5 mg and 9.2% at 1 mg [1]. Vomiting, diarrhea or other persistent symptoms can lead to dehydration and kidney injury; diarrhea does not have to accompany vomiting for fluid loss to matter:
The majority of the reported events occurred in patients who experienced gastrointestinal reactions leading to dehydration such as nausea, vomiting, or diarrhea.[1]
That sentence is about acute kidney injury reported after approval, some cases needing dialysis. The Medication Guide asks you to drink fluids to lower the chance of dehydration and to tell your prescriber right away about nausea, vomiting or diarrhea that does not go away [1].
Pancreatitis, bowel obstruction and severe dehydration are the stomach emergencies on the label
| Problem | Signs | How often | Label section |
|---|---|---|---|
| Acute pancreatitis | Persistent or severe belly pain, sometimes into the back, with or without nausea or vomiting | 0.3 vs 0.2 cases per 100 patient-years (vs comparators) | 5.2 |
| Ileus or intestinal obstruction | Not described on the label; severe or worsening belly pain is the cue to call | Postmarketing reports; rate unknown | 6.2 |
| Severe constipation, fecal impaction | Not described on the label beyond the condition itself | Postmarketing reports; rate unknown | 6.2 |
| Dehydration leading to kidney injury | Vomiting, diarrhea or nausea that won't stop | Postmarketing reports, some needing dialysis | 5.6 |
| Severe digestive reactions | Stomach problems that are severe or won't go away | 0.4% (0.5 mg) and 0.8% (1 mg) vs 0% | 5.7 |
| Gallstones | Upper belly pain, fever, yellow skin or eyes, clay-colored stools | 1.5% (0.5 mg) and 0.4% (1 mg) vs 0% | 5.9 |
Ozempic prescribing information and Medication Guide, DailyMed version 20, June 2026. Voluntary postmarketing reports do not reliably establish frequency or causation. A 0% trial cell is an observed result in that sample, not proof a reaction is impossible.
Ozempic isn't recommended for people with severe gastroparesis
The label is direct: "OZEMPIC is not recommended in patients with severe gastroparesis" [1]. Tell your prescriber about any past pancreas problems, slow stomach emptying or trouble digesting food. Because Ozempic slows the stomach, tell every surgeon and anesthetist that you take it before a procedure that needs anesthesia or deep sedation.
Wegovy contains semaglutide but has its own formulations, doses, populations and side-effect data; see Wegovy and nausea. Tirzepatide's stomach effects are in tirzepatide side effects. For Ozempic's full safety picture, see is Ozempic safe?; for thirst, peeing more and dry mouth, see Ozempic and thirst. If you use compounded semaglutide, see is compounded semaglutide safe?