How the documents record it
Heartburn itself is not a separate row in the US table. The closest terms are gastro-oesophageal reflux disease, the condition behind most heartburn, and dyspepsia, a burning or uncomfortable feeling in the upper belly. [1][6] The patient leaflets in the EU and Canada use plainer words, listing heartburn, indigestion and inflamed stomach lining among common effects. [2][3]
| Term and group | Saxenda® | Placebo | Source |
|---|---|---|---|
| Reflux disease, adults | 4.7% (159 of 3,384) | 1.7% (33 of 1,941) | US Table 2; Canada Table 3 [1][3] |
| Dyspepsia (indigestion), adults | 9.6% (326) | 2.7% (53) | US Table 2; Canada Table 3 [1][3] |
| Gastritis, adults | 1.4% (48) | 1.1% (22) | Canada Table 3 [3] |
| Dyspepsia, ages 12–17 | 4.0% | 2.4% | US Table 3 [1] |
| Reflux, dyspepsia, gastritis | Common | — | EU Table 4 [2] |
Putting the numbers in proportion
Reflux was nearly three times as frequent on Saxenda® as on placebo, and indigestion more than three times, though in absolute terms the extra is about three and seven people in every hundred. [1] Neither was among the reactions that most often led people to stop. [1]
The EU and Canadian leaflets place these effects alongside nausea and wind as problems affecting the stomach and intestines, and say the very common stomach effects usually settle over days or weeks. [2][3] The leaflets do not give a separate time course for heartburn.
What research adds
A systematic review published in 2025 in Gastroenterology pooled 55 placebo-controlled trials in 106,395 people. GLP-1 medicines probably increased the risk of reflux disease, with a relative risk of 2.19, about four more cases per 1,000 people. The rise appeared larger in trials of people with overweight or obesity and with weight-loss-inducing or higher-dose medicines, though those subgroup differences were not statistically significant. [4]
A small Mayo Clinic trial showed what liraglutide 3 mg does to the stomach. Over 16 weeks it slowed the emptying of solid food, and the volume people could drink before feeling uncomfortably full tended to be lower, a difference just short of statistical significance. [5] Feeling full sooner is part of how the medicine reduces appetite, and it is also one of the sensations people describe as indigestion. [8]
Why reflux may get worse
The label establishes that liraglutide delays gastric emptying. [1] Food staying longer in the stomach is a plausible reason for reflux and fullness, although the label does not spell out that link for heartburn. [1][5]
MedlinePlus explains that reflux happens when the muscle at the lower end of the oesophagus does not close properly, letting stomach contents move back up, and that large meals and lying down soon after eating can bring it on. [7] The same slower stomach is why the label asks you to tell healthcare providers before surgery or deep sedation: rare cases of stomach contents being inhaled have been reported with GLP-1 medicines. [1]
Other triggers worth ruling out
- Excess weight, pregnancy, smoking and a hiatal hernia all make reflux disease more likely. [7]
- Spicy, fatty or chocolate-rich food, caffeine and alcohol can trigger symptoms. [6][7]
- Eating too much or too fast, stress, tiredness and some medicines can cause indigestion, including anti-inflammatory painkillers, some antibiotics, iron supplements, bone medicines and steroids. [8]
- Stomach ulcers and infection with H. pylori bacteria are common medical causes of indigestion. [8]
Steps the health sources describe
For reflux disease, MedlinePlus lists eating smaller meals, avoiding lying down for a few hours after eating, avoiding foods that trigger your symptoms, raising the head of the bed, stopping smoking and losing weight where needed. [7] Smaller portions fit with how Saxenda® already reduces appetite. [1]
Over-the-counter medicines such as antacids may help, and longer-lasting heartburn may need prescription treatment. [6][7] Ask a pharmacist before buying one, and tell them you use Saxenda®, because the US label asks for monitoring of oral medicines taken with a medicine that slows the stomach. [1]
The NIH advises seeing a doctor if indigestion does not improve, and MedlinePlus suggests seeing a provider if indigestion lasts more than two weeks. [8][9] The Medication Guide asks you to report stomach problems that are severe or lasting. [1]
Saxenda® is a registered trademark of Novo Nordisk A/S. PepLabo is not affiliated with or endorsed by Novo Nordisk.
When to get help
| Sign | Who to contact | How fast | Source |
|---|---|---|---|
| Chest pain with shortness of breath, or pain in the jaw, neck or arm | Emergency number now; may be a heart problem | Emergency | MedlinePlus [7]; NIDDK [8] |
| Bloody vomit or black, tar-like stools | Emergency care | Emergency | NIDDK [8] |
| Severe, constant upper belly pain, possibly reaching the back | Stop Saxenda® and get medical help right away | Emergency | Medication Guide [1]; NIDDK [8] |
| Difficulty or pain on swallowing, frequent vomiting, yellow eyes or skin, or weight loss without trying | A doctor right away | Today | NIDDK [8] |
| Heartburn more than twice a week, or indigestion lasting over two weeks | Your prescriber or GP | At your next appointment | MedlinePlus [6][9] |
| Planned surgery or a procedure with sedation | Tell the team you use Saxenda® | At your next appointment | Prescribing Information [1] |
