What people notice
Semaglutide may quiet hunger, but stomach trouble is common.
First come the reports from people. Then come the risks found in studies and safety reviews.
What may change and what may hurt
Semaglutide may quiet thoughts about food and help weight come down; people with diabetes also report better blood-sugar readings. These accounts cannot forecast what you will feel.
The common complaints are nausea, bad-smelling burps, bowel changes, and early tiredness. Study reports back some stomach problems, while other claims haven't been tested well. This page keeps the two kinds of proof apart.
First you will read what people say they felt. Next come the risks found in studies and safety reviews. Nothing here gives you a dose or picks a treatment.
What people say Semaglutide changed
Some accounts came from research-use groups, where people discussed semaglutide outside medical care. Others came from patients taking a prescription. These are personal stories; no study has proved them. No study tested these reports against a placebo, a look-alike treatment without semaglutide. A personal account may help you name a concern, but it can't show what caused it. No dose appears here.
Hunger and cravings
Many people say steady thoughts about food grow quiet, often within the first week or two. They get full sooner and may eat a third to a half of their old portions. Sweets and rich meals may lose their pull, while some people turn to fruit, vegetables, and lighter meals. A few notice only a small change or say the change fades.
Weight, blood sugar, and drink
Most stories describe weight falling for several months, then slowing. People often credit smaller meals rather than more exercise. Some with type 2 diabetes report steadier sugar and a better reading on the blood test that looks back several months. A smaller group loses interest in alcohol. These are things people noticed, not a forecast for you.
Stomach and bowel trouble
Nausea is named most often, and some people vomit when it is worst. The trouble may start early or after the amount rises; it can ease within a week or two, then return after rich food. Constipation and diarrhea may trade places, along with heartburn, swelling, and egg-like burps. Some stories describe mild trouble, while others describe a hard time.
Other changes
Some people feel tired soon after a shot, mainly in the early weeks. Others report a metal taste, strong smells, headache, or feeling faint. Too little food or drink may add to the last two problems. Losing weight quickly may bring brief hair loss or a thinner-looking face. The needle spot may briefly be red, itchy, lumpy, or sore.
The stories don't all match: one person may have less hunger but hard nausea, while another may notice little change. You can use this list to name a concern, but not its cause. A doctor can check whether a new symptom needs care.
Safety and cautions
The points below come from published studies and safety reviews. Some harms occurred in people; other warnings began with animal tests. A few risks aren't settled, and this isn't dose advice.
Stomach trouble while the amount goes up. Nausea, vomiting, diarrhea, and constipation led many people to stop. Most trouble was mild to moderate and passed soon [23]. One review found nausea in close to a third of patients [5], and reports from people also name stomach trouble most often [24].
Certain thyroid cancers. These GLP-1 medicines copy a gut hormone. The strongest label warning came from thyroid tumors in rodents. Studies in people haven't shown that semaglutide raises this cancer risk. Still, the label bars use after some rare thyroid cancers in a person or family. The warning also covers multiple endocrine neoplasia type 2, a rare inherited illness that can cause thyroid cancer and tumors in other hormone-making glands [25][5].
A sore and swollen pancreas. A doctor calls this pancreatitis, and the label warns about it; pancreatitis isn't cancer. In a separate finding, too few pancreas cancers occurred to tell whether semaglutide changed that risk [5].
Gallstones and blocked bile tubes. A safety review found more gallstone illness with semaglutide. Losing a lot of weight quickly may explain much of the rise. Still, studies and reports found more cases than with a placebo [5]. A doctor can tell you which signs need quick care.
Diabetic eye trouble. SUSTAIN-6 found more serious eye trouble with semaglutide [2]. Most cases involved people who had eye damage from type 2 diabetes before the study. Their trouble followed a steep drop in blood sugar. The paper's 95% range shows where the group result could reasonably fall. It stayed on the side of more eye trouble, but its width left the size of that risk unsure. A safety review calls for close eye checks during such a drop [5].
Muscle lost with fat. A scan showed that muscle was included in the lost weight, not just fat [20]. This may matter more for an older adult, though lasting harm wasn't proved. A doctor can discuss food, strength, and ways to watch both.
Weight returning after the medicine stops. In the STEP 1 follow-up, people regained about 11.6 percent of the weight they had at the start within a year [21]. In STEP 4, weight came back after a placebo replaced semaglutide [22]. These averages can't foretell how much one person might regain.
Hair loss after weight falls fast. Reports of hair loss were more common with semaglutide and a related drug [14]. A skin study tied short-lived hair loss across the scalp to losing much weight quickly [15]. This points more toward the weight change than direct drug harm.
Pregnancy. The label says semaglutide must not be used during pregnancy. About half remains in the blood after one week, and leaving the body may take five weeks after the last dose. The label often sets a wait of about two months before a planned pregnancy [17]. Your prescriber can explain that timing.
The pill and an empty stomach. An extra ingredient helps some medicine pass from the stomach into blood, but only a very small share of each pill gets through. Food, another pill, or a drink can cut that share further [18]. That is why the label gives strict empty-stomach rules.
Semaglutide side effects found in studies
Nausea, vomiting, diarrhea, constipation, heartburn, and bad-smelling burps head the list. They often pass as the body gets used to the medicine [23][5]. Less common warnings involve thyroid cells, the pancreas, gallstones, and diabetic eye trouble. Each warning says whether the support came from people, animals, or safety reports.
Compounded semaglutide
A national shortage ran from about 2022 to early 2025. During that time, certain pharmacies could mix compounded semaglutide in place of the factory-made drug. Officials found wrong doses, hospital stays, and products with unproved or non-drug contents. They narrowed that special permission after declaring the shortage over in 2025 [5].
The large studies tested the approved factory product, not every pharmacy-made batch. Questions remain about the strength, contents, and safety of those batches. These pages don't direct you to any drug seller.
What Semaglutide was approved for over time
Semaglutide grew from work on GLP-1, a hormone the gut sends out after food, and an earlier drug. Approval for type 2 diabetes came in 2017. The daily tablet arrived during 2019-2020, followed by long-term weight care in 2021 [1].
SELECT reported heart results in 2023 [3], while FLOW reported kidney results in 2024 [6]. Uses for heart and kidney illness came after those studies, and a serious fatty liver use followed in 2025 [16].
Semaglutide has been an approved medicine through these years, not a chemical sold only for research. That difference matters when you read claims online.