Ozempic Side Effects: From the First-Week Nausea to the Question Everyone Asks About Hair

What are the most common Ozempic side effects?

Ozempic slows how fast your stomach empties. It also turns down hunger signals in the brain. Most of what people feel in the first weeks comes from those two effects.

The figures below come from Ozempic's FDA prescribing information, revised in May 2026. They come from two type 2 diabetes trials that compared Ozempic with a placebo, a dummy shot with no drug in it.

• Nausea: 16% at 0.5 mg and 20% at 1 mg, versus 6% on placebo. It is usually worst in the first weeks and after each dose increase.
• Vomiting: 5% and 9%, versus 2% on placebo.
• Diarrhea: about 9% at either dose, versus 2% on placebo.
• Belly pain: 7% and 6%, versus 5% on placebo.
• Constipation: 5% and 3%, versus 2% on placebo.
• Burping, heartburn and gas: less common, under 5% each.
• Tiredness, a changed sense of taste and dizziness: less common still.
• Redness or discomfort where you inject: rare, about 2 in 1,000 people in the trials.

None of this means something has gone wrong. It is the drug doing what it is built to do. That is also why the dose starts low and climbs slowly, one step every 4 weeks at the earliest.

Ozempic pill side effects

Since May 2026, Ozempic also comes as a daily tablet. It shares one FDA label with Rybelsus, the older semaglutide tablet. In its trials, nausea affected up to 20% of people on the tablet, versus 6% on placebo. So the stomach side effects look much like the shot's.

What differs is the routine. You take it each morning on an empty stomach, with up to 4 ounces of water. Then you wait at least 30 minutes before eating, drinking or taking other pills. Otherwise, less of the dose gets absorbed.

Is Ozempic safe for weight loss?

Ozempic is FDA-approved only for adults with type 2 diabetes. In that group, it lowers blood sugar and cuts the risk of heart and kidney problems. Wegovy, a higher-dose version of the same drug, semaglutide, is the one approved for weight loss.

So using Ozempic only to lose weight is off-label. That means a doctor prescribes it for a use the FDA did not review.

Off-label does not mean untested. Wegovy's weight-loss trials studied the same drug at doses close to Ozempic's top dose. The side effects were much the same.

The bigger catch is money. Plans that cover Ozempic for diabetes often deny it when the reason is weight loss. For most healthy adults without diabetes, it is a cost question more than a safety one.

For the side effects measured in Wegovy's own trials, see Wegovy side effects. For the drug across all its brands, see semaglutide side effects. For the whole drug family, see GLP-1 side effects.

Do Ozempic side effects include hair loss?

Hair loss is on Ozempic's label, among reports collected after the drug reached the market. But there is no known way semaglutide acts on hair directly.

What happens in some people is telogen effluvium. That is a temporary, all-over shedding that can follow any fast weight loss. Quick weight loss pushes many hairs into a resting phase at once. A few months later, those resting hairs fall out together. Eating less food and less protein is thought to add to it.

The timing surprises people. Shedding tends to start a few months after the weight loss, not right after the first shot. For most people it stops on its own. Hair usually fills back in over several months once weight and eating settle.

Wegovy's label gives figures by sex. In its weight-loss trials, 4% of women on Wegovy reported hair loss, versus 2% of women on placebo. The label links this hair loss to weight reduction.

If you already notice thinning in perimenopause, that same shedding pattern is worth understanding. See perimenopause hair loss for what else can drive it and what helps.

Are Ozempic side effects different for women over 40?

Ozempic's label lists the same warnings for everyone. Still, a few findings matter more in midlife.

• Hair loss: reported more often in women than in men in Wegovy's trials, as above.
• Hip and pelvis fractures: in SELECT, a large heart trial of Wegovy, they affected 1% of women on semaglutide, versus 0.2% on placebo. Bones already thin faster after menopause, so this is worth knowing.
• Pregnancy: you can still get pregnant in perimenopause. The label says to stop Ozempic at least 2 months before a planned pregnancy, because the drug takes that long to clear.
• Muscle: perimenopause already chips away at muscle. So the lean mass lost along with weight counts for more. The muscle section below covers it.

What are the bad, serious side effects of Ozempic?

A second, shorter list sits behind the common complaints. These are less frequent, but they are why Ozempic carries the warnings it does.

• Pancreatitis: inflammation of the pancreas. It is uncommon, but it has been seen with Ozempic and other drugs in its class. Severe belly pain that can spread to your back is the sign to watch.
• Gallbladder disease: gallstones showed up in 1.5% of people on the 0.5 mg dose, and in no one on placebo. Wegovy's label adds that the risk stayed higher even after accounting for weight loss.
• Thyroid C-cell tumors: Ozempic carries a boxed warning, the FDA's strongest kind. Semaglutide caused these tumors in rodents, and it is unknown whether it does in humans. It is off-limits if you or a family member had medullary thyroid cancer, or if you have MEN 2, a rare inherited condition that causes gland tumors.
• Low blood sugar: the risk rises when Ozempic is combined with insulin or a sulfonylurea, an older type of diabetes pill. With long-acting insulin, 30% of people on 1 mg had symptoms of low blood sugar, versus 15% on placebo. That is why a prescriber often lowers the other drug's dose first.
• Eye problems in diabetes: diabetic retinopathy is damage to the back of the eye from diabetes. In SUSTAIN-6, a two-year heart trial, its complications were more common on Ozempic than on placebo. The extra risk was larger in people who already had retinopathy.
• Kidney injury: most reported cases followed dehydration from vomiting or diarrhea. That is why drinking enough during a rough stomach stretch matters.
• Severe stomach reactions: a warning added to the label in October 2025. Ozempic is not recommended for people with severe gastroparesis, a condition where the stomach empties very slowly.
• Serious allergic reactions: rare, and they can include swelling of the face or throat. After a serious allergic reaction to semaglutide, Ozempic is off-limits.
• Breathing in stomach contents under anesthesia: Ozempic slows the stomach, so food can still be there during surgery or sedation. Tell your care team you take it before any planned procedure.
• Pen sharing: never share an Ozempic pen, even with a new needle. It can pass on infections.

Which side effects need same-day medical attention?

The everyday nausea and bloating above are one thing. The signs below are different. They overlap with the serious risks and should not wait for a routine message. They come from Ozempic's Medication Guide, the FDA-approved leaflet for patients.

• Severe stomach pain that won't go away, with or without vomiting. It may spread to your back. This can be a sign of pancreatitis.
• Pain in your upper belly, fever, yellow skin or eyes, or clay-colored stools. These can point to a gallbladder problem.
• A lump or swelling in your neck, hoarseness, trouble swallowing or shortness of breath. The label asks you to report these because of the thyroid warning.
• Changes in your vision.
• Nausea, vomiting or diarrhea that won't go away. The fluid loss can harm your kidneys.
• Signs of low blood sugar if you also take insulin or a sulfonylurea, such as shakiness, sweating, confusion or a fast heartbeat.
• Swelling of your face, lips, tongue or throat, or trouble breathing or swallowing. These can mean a serious allergic reaction, so get emergency help.

One more topic circulated widely: mood and suicidal thoughts. After reports starting in 2023, the FDA reviewed trial and safety data across the whole drug class. In January 2026, the agency concluded that these drugs do not raise the risk of suicidal thoughts or behavior.

Ozempic's label never carried that warning. The FDA asked for it to be removed from the weight-loss labels of Wegovy, Saxenda and Zepbound. Still, new or worsening low mood, or any thought of self-harm, deserves a call right away. You can also call or text 988 at any hour.

What about the long-term side effects of Ozempic?

Ozempic has been approved for type 2 diabetes since 2017. So there are years of safety data in that group. What is newer is the scale of off-label use for weight loss, often for years at a time.

A few questions are still being studied:

• Bone and muscle: how years of fast weight loss affect them.
• The thyroid signal: whether what was seen in rodents means anything for people, as more years of use pile up.
• Stopping: what happens to weight and blood sugar afterward. In the STEP 1 extension, people who stopped semaglutide regained most of the lost weight within a year.

One bone finding is already on a label for women, covered above. None of this points to a hidden danger. It is the honest state of a drug whose weight-loss use is younger than its diabetes use.

Does Ozempic cause muscle loss?

Yes, to some degree. Part of the weight lost on semaglutide is lean mass, which includes muscle. In STEP 1, the main semaglutide weight-loss trial, about 6 in 10 pounds lost were fat.

This matters more after 40, because perimenopause already chips away at muscle. For the research and what protects muscle, see GLP-1s and muscle loss in perimenopause.

Are Ozempic side effects different in men?

The label's warnings are the same for men and women. Wegovy's trials found one clear gap: hair loss was reported more often in women.

Sexual and hormonal health in men is still being sorted out. Some early studies raised questions about erectile function on semaglutide. Weight loss itself tends to raise testosterone in men with obesity, which points the other way. The findings are too mixed to settle yet.

How do you manage the common side effects?

A handful of habits cover most of what shows up in the first weeks.

• Follow the dose schedule: each step lasts at least 4 weeks to give your gut time to adjust. Moving up faster tends to backfire.
• Eat smaller, lower-fat meals: Ozempic already slows digestion. A large or fatty meal on top of that is a common trigger for nausea.
• Drink enough fluids: this matters most when you are vomiting or have diarrhea. It is your best guard against the kidney problems above.
• Pick your timing: you can inject at any time of day, with or without food. Some people choose a day that keeps the queasiest stretch away from busy days.

Where to get help if a side effect isn't settling

If a symptom drags on past the first few months, you may want a follow-up visit or a lab test. Providers differ less in sticker price than in what is included once you are enrolled.

PlushCare is online primary care that takes insurance. That helps if a side effect means more than one follow-up visit. PlushCare says most in-network patients pay $30 or less a visit.

Ro works the other way. You pay a monthly membership, and the medication is billed on top. The membership includes a metabolic lab test at Quest when your Ro provider orders it. So a basic blood panel to sort out a symptom is often already part of what you pay.

• Ro membership: about $150/mo · First month $39 · About $75/mo on a 12-month prepay

Mochi Health and Henry Meds both sell compounded semaglutide. That is a version mixed by a pharmacy, and it is not FDA-approved like the Ozempic pen. Mochi can also prescribe brand-name drugs, at a separate price.

Mochi publishes a price for each dose, so you can see how the bill climbs as you go up. Henry Meds charges one all-in price with no membership fee. Its compounded semaglutide shot costs about $300 a month, and its prepaid plans cost less per month.