Semaglutide side effects: what to expect

Semaglutide, the active ingredient in Ozempic and Wegovy, helps many people lose significant weight. But like any medication, semaglutide also has side effects. In this article, you can read which side effects occur most often, when they disappear, which signs are serious and what you can do to limit symptoms. So you know exactly what to look out for.

What are the most common semaglutide side effects?

The most common side effects of semaglutide are gastrointestinal problems. Nausea occurs in approximately 44 percent of Wegovy users, followed by diarrhea (30 percent), vomiting (25 percent), and constipation (24 percent). These symptoms are directly related to how semaglutide works: the medicine slows gastric emptying, so that food stays in the stomach longer. This inhibits appetite, but can also cause discomfort. Other commonly reported side effects include headache, tiredness and a slightly increased heart rate. A small proportion of users also experience temporary hair loss, which is probably related to rapid weight loss and not to the drug itself.

When do semaglutide side effects disappear?

For most users, the side effects decrease noticeably after four to eight weeks. The body gradually gets used to the altered gastric emptying and to the higher GLP-1 activity. The build-up schedule used at Wegovy, where the dose is increased step by step from 0.25 to finally 2.4 mg per week, was designed for exactly that reason. If you go through the titration phase as prescribed, you will in most cases experience far fewer symptoms than if you start abruptly at a higher dose. Research shows that only 4.5 percent of the semaglutide users in the STEP 1 study quit due to gastrointestinal problems, compared to 0.8 percent in the placebo group.

Are there any serious side effects of semaglutide?

Yes, but they are weird. The main serious side effect is pancreatitis, an inflammation of the pancreas. Symptoms include severe persistent abdominal pain, sometimes radiating to the back, combined with nausea or vomiting. Anyone experiencing this should stop taking semaglutide immediately and consult a doctor. In addition, there is an increased risk of gallstones, especially with rapid weight loss. This is how a safety review of semaglutide concludes that gallstones are the most relevant serious side effect when used for a long time. Another rare side effect is an eye disorder called NAION, which can affect vision, which affects approximately 1 in 10,000 patients per year. Severe dehydration due to persistent vomiting or diarrhea can also lead to kidney problems.

What are the long-term side effects?

In the long term, side effects of semaglutide are relatively rare. The most commonly reported are gallstones, which are more common in people with rapid and substantial weight loss, and fatigue in the first months of treatment. A meta-analysis of four clinical trials shows that semaglutide users without diabetes were 1.59 times more likely to have gastrointestinal problems than people who received a placebo, but that serious side effects were limited in the longer term. Goodweigh actively guides patients through periodic checks so that any signals are picked up early.

How do you reduce semaglutide side effects?

There are a number of practical measures that can significantly reduce complaints. Eating slowly, eating small portions and avoiding fatty or highly spicy meals helps to stress the stomach less. Good hydration is important, especially in cases of diarrhoea or vomiting. Intensive exercise immediately after the injection can increase nausea; a leisurely walk just after eating is a better alternative. Those who continue to suffer can temporarily delay titration by staying at a lower dose longer. Bee the Goodweigh program receive customized guidance for these types of complaints, so you don't have to make decisions about your dosage on your own.

When should you stop taking semaglutide due to side effects?

Stopping is recommended if you have severe persistent abdominal pain, severe dehydration that does not improve with fluid intake, difficulty swallowing or breathing, or an allergic reaction such as rash or swollen lips. Even in the event of jaundice or greatly reduced urine output, you should consult a doctor immediately. In less acute cases, such as persistent nausea that interferes with daily functioning, Goodweigh will work with you to decide on a temporary dose reduction or a break in treatment.

Does semaglutide differ from other GLP-1 agents in side effects?

The side effect profile of semaglutide is very similar to that of the weight medicine Saxenda, which contains the active substance liraglutide. However, there is a relevant difference: semaglutide is administered weekly, while liraglutide must be injected daily. The higher peak concentrations of a daily medicine may lead to more acute symptoms, while the weekly dose of semaglutide provides a more stable blood level. This is what a large-scale meta-analysis in the British Medical Journal shows that gastrointestinal complaints are the main side effect for the entire GLP-1 class, but that the profile varies by drug and dose. Wegovy for weight loss country Ozempic for type 2 diabetes contain the same active ingredient semaglutide, but are intended for different indications and dosages.

Side effects don't have to be a reason to stop

Most semaglutide side effects are mild, temporary and easily manageable. They are most pronounced in the first weeks of treatment, when the body needs to get used to the drug. With the right guidance, you will get through this phase and achieve sustainable results. Do you want to know more about how semaglutide works or what the side effects of Ozempic are you specific? Goodweigh helps you every step of your treatment.

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