Acid Reflux and Heartburn on GLP-1 Medications: Why It Happens and What to Eat

Heartburn, acid reflux, indigestion (dyspepsia) and burping are common side effects of semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro): all four US labels list reflux, indigestion and burping among the digestive side effects that were more frequent than on placebo^[1,2,3,4]. The most cited explanation is that the stomach empties more slowly, especially early in treatment^[2,4,8]. What usually helps is eating smaller portions, cutting back on fat, finishing dinner at least 3 hours before bed, not lying down after eating and raising the head of your bed^[8,11,12,15]. Call your prescriber if swallowing is hard, you vomit often or the heartburn doesn’t improve^[10,15]. And if you feel a tight, squeezing pain in your chest, call 911^[17].

I built this guide from the US prescribing information for Wegovy, Zepbound, Ozempic and Mounjaro, a consensus of Spanish experts on the digestive side effects of these drugs, the 2025 joint advisory on nutrition and GLP-1 therapy from four US medical and nutrition societies, and the reflux pages of the NIDDK (part of the US National Institutes of Health) and the UK’s NHS. Where the US labels don’t report a figure, I use the EU prescribing information and say so. On names: Ozempic and Mounjaro are the type 2 diabetes versions of semaglutide and tirzepatide; Wegovy and Zepbound are the same molecules approved for weight management. The general eating guide is what to eat on GLP-1 medications.

What the labels say

First, two terms. Gastroesophageal reflux disease (GERD) is when stomach contents keep coming back up into the esophagus, the tube that connects your throat to your stomach; heartburn, a burning feeling in the middle of the chest, is its best-known symptom. Dyspepsia is the medical word for indigestion. Burping is listed on the labels as eructation.

The European prescribing information mostly gives frequency bands for these symptoms (“common” means up to 1 in 10 people)^[5,6]. The US labels give percentages, so these tables use them. First, the weight-management trials:

Sources: US labels for Wegovy (Table 3; 3 trials of up to 68 weeks in adults) and Zepbound (Table 1; 2 trials of up to 72 weeks in adults with and without type 2 diabetes)^[1,2].

And the type 2 diabetes trials, with lower doses and smaller figures:

Sources: US labels for Ozempic and Mounjaro (section 6.1, pools of placebo-controlled trials)^[3,4]. The figures come from different trials and don’t compare the drugs; the labels themselves warn that rates from one drug’s trials can’t be directly compared with another’s^[1,2,3,4].

Three more facts:

• Wegovy tablets. The US label says side effects were similar to the injection’s^[1]. The EU prescribing information is more specific: in the 64-week OASIS 4 trial, indigestion affected 18.1% of people on oral semaglutide, versus 8.8% on placebo^[5].
• Ozempic with another diabetes drug. Also from the EU prescribing information: in the SUSTAIN 9 trial, taken with an SGLT2 inhibitor, reflux occurred in 4% of people on semaglutide 1 mg and in no one on placebo, and it did not decrease over time^[6].
• When it shows up. The Wegovy label says these digestive side effects were reported most often during dose escalation^[1].

Why GLP-1 medications cause heartburn and reflux

The stomach empties more slowly. All four US labels state that the drug delays gastric emptying, the passage of food from the stomach into the intestine^[1,2,3,4]. The 2025 advisory links that delay to bloating, fullness and nausea. It adds that foods high in fat or protein slow emptying even further^[7].

The effect is strongest at the start. The Zepbound and Mounjaro labels say the delay in gastric emptying is largest after the first dose and diminishes over time^[2,4]. For semaglutide, the Ozempic label describes a minor delay in gastric emptying early after a meal, and in a separate study no apparent effect on the rate of gastric emptying with semaglutide 2.4 mg^[3]. The EU prescribing information for Wegovy puts that down to a probable tolerance effect^[5].

A likely link, not a proven one. The Spanish consensus explains that GLP-1 medications have occasionally been described as making reflux worse, possibly because of that temporary delay in stomach emptying. It also points out that reflux is already common in people with obesity^[8]. I haven’t found trials that measure how long reflux lasts on these drugs.

In the long run, weight loss usually helps. The NIDDK lists overweight and obesity among the factors that lead to reflux^[10], and the Spanish consensus notes that symptoms improve as weight comes down^[8].

What to eat if you have heartburn or reflux

The NIDDK and the NHS agree on the basics: figure out what bothers you and cut back on it^[12,15]. These tips combine their pages and the Spanish consensus:

• Smaller, more frequent meals. Both the NHS and the Spanish consensus recommend them^[8,15]. In the SURMOUNT trials, people with hard-to-tolerate digestive symptoms were first advised to split their 3 daily meals into 4 or more smaller ones and to stop eating when they felt full, according to the Rubino analysis^[9]. The weekly menu for small appetites can help you plan small meals.
• Less fat and less fried food. Bake, grill or boil instead, as the Spanish consensus suggests^[8].
• Eat slowly and stop at the first sign of fullness. That’s also from the Spanish consensus^[8]. Saving the rest for later is completely fine.
• Sip fluids. If nausea persists, the Spanish consensus recommends drinking 30 to 60 minutes before or after meals rather than with them^[8]. Still drink what you need: the hydration calculator shows a general daily reference.

Foods that often make reflux worse

The NIDDK lists the foods and drinks most often linked to symptoms, and stresses that triggers vary from person to person^[12]:

About mint: it’s often suggested as a tea for nausea, but it can make reflux worse. If you have both, ginger, which isn’t on these lists, may sit better; I explain it in GLP-1 nausea and what to eat.

You don’t need to cut out everything. The NIDDK suggests talking with your doctor about what seems to set you off and cutting back on it to see whether you improve^[12]. Noting what you eat and when the heartburn shows up in the symptom diary helps you find your own triggers.

Four swaps for eating with less fat

If fat gives you heartburn, these swaps with foods from our database cut the fat in a snack or side a lot. Protein drops a little in the first two and goes up in the other two:

Composition data: USDA FoodData Central^[18], as listed on each food page. For mild, low-fat main dishes such as chicken, turkey or cod, filter the filling foods finder to easy-to-digest foods.

Burping: swallow less air

Burping appears on all four US labels, which don’t explain why it happens or describe its smell^[1,2,3,4]. The NIDDK explains that you swallow more air when you chew gum, suck on hard candy, drink fizzy drinks and eat or drink too fast^[13]. To burp less, it suggests avoiding gum, hard candy, fizzy drinks and drinking through a straw, and eating more slowly^[14]; the Spanish consensus also advises against straws^[8]. As for the “sulfur burps” that smell like rotten eggs and get discussed online, I haven’t found any studies.

When to eat, and how to position yourself afterward

The NHS explains that symptoms are often worse after eating, when lying down and when bending over^[15]. So timing and posture matter as much as the menu.

• Eat dinner early. The NIDDK says that if you have symptoms at night or when lying down, eating at least 3 hours before you lie down or go to bed may help^[12]. The NHS says 3 or 4 hours^[15]. If you go to bed at 11 p.m., that means finishing dinner by about 8 p.m.
• Don’t lie down after eating. The Spanish consensus advises this, along with not eating too close to bedtime^[8].
• Raise the head of your bed. The NHS suggests raising it by about 10 to 20 cm (4 to 8 inches) with blocks of wood, bricks or books under the legs, so your chest and head are above your waist^[15]. The NIDDK suggests 6 to 8 inches (15 to 20 cm) with a foam wedge or extra pillows under your head and upper back^[11]. They don’t agree on that last part: the NHS advises against extra pillows, because they can increase pressure on your belly^[15].
• Loose clothes around the waist, and no smoking. Both tips are from the NHS^[15]; the NIDDK also recommends quitting smoking^[11].

Antacids and other medicines: your prescriber’s call

There are several kinds of heartburn medicines: antacids, alginates, H2 blockers such as famotidine, and proton pump inhibitors such as omeprazole. Which one to use and for how long is a decision for your prescriber or pharmacist. Three facts for that conversation:

• They’re not for daily use without supervision. The NIDDK warns against taking antacids every day, or for severe symptoms, without talking to your doctor, and says they can cause diarrhea or constipation^[11]. The NHS adds that they don’t cure the problem and shouldn’t be taken regularly for long periods^[15].
• Slower emptying affects other medicines. All four US labels warn that the delay in gastric emptying may affect the absorption of other medicines taken by mouth^[1,2,3,4]. The tirzepatide labels go further for birth control pills: they advise switching to a non-oral method, or adding a barrier method, for 4 weeks after starting and for 4 weeks after each dose increase^[2,4]. Always mention that you take semaglutide or tirzepatide.
• Some painkillers make heartburn worse. The NHS names ibuprofen and aspirin and advises not taking them unless they’ve been prescribed^[16]; the NIDDK lists NSAIDs among the medicines that can worsen reflux^[10]. The NHS also says not to stop any prescribed medicine without speaking to a doctor first^[15].

If you’re having surgery or a procedure with anesthesia or deep sedation, tell the team you take the medication. The US labels report rare postmarketing cases of pulmonary aspiration (stomach contents getting into the lungs) in people on GLP-1 medications who had food left in their stomach during general anesthesia or deep sedation, even after following fasting instructions^[1,2,3,4], and the Medication Guides ask you to tell all your healthcare providers before any planned procedure^[1,2,4].

When to call your doctor right away

Frequently asked questions

Is it normal to get heartburn on Ozempic, Wegovy or Zepbound?

Yes, all four US labels list reflux and indigestion among the side effects that were more common than on placebo^[1,2,3,4]; on Wegovy, reflux affected 5% and indigestion 9%^[1]. Common doesn’t mean you have to put up with it: bring it up with your prescriber.

Does it go away with time?

Probably, in many cases, although there’s no direct data. The tirzepatide labels say the effect on gastric emptying diminishes over time^[2,4], the Ozempic label found no apparent effect on emptying rate with semaglutide 2.4 mg in a separate study^[3], and the Spanish consensus says reflux improves as weight comes down^[8]. But in the SUSTAIN 9 trial with Ozempic, reflux did not decrease over time^[6].

What should I eat for dinner if I get reflux at night?

Something small and low in fat, such as baked white fish with a boiled potato, or an omelet with a slice of toast. Finish at least 3 hours before bed^[12], and skip whatever you’ve noticed tends to bother you.

Can I take omeprazole or another acid reducer?

That’s a decision for your prescriber or pharmacist, who know the rest of your treatment. Tell them you take semaglutide or tirzepatide.

What if I also have diarrhea?

The tips overlap: small meals, little fat and fluids in sips. I cover it in diarrhea on GLP-1 medications: what to eat, and if your problem is the opposite, in constipation on GLP-1 medications. To keep your fluids up, see hydration on GLP-1 medications.