Tirzepatide Side Effects: What's Common, What's Serious, What Helps

The most common side effects of tirzepatide are digestive: nausea, diarrhea, vomiting and constipation. In the Zepbound® weight-loss trials, nausea affected 25% to 29% of people (8% on placebo), diarrhea 19% to 23% (8%) and constipation 11% to 17% (5%), according to the Zepbound prescribing information revised in August 2026. Most of these happened while the dose was being raised, were mild to moderate and eased over time. Serious side effects are uncommon: pancreatitis, gallbladder disease, kidney injury from dehydration, severe allergic reactions, and low blood sugar in people who also take insulin or a sulfonylurea. On November 9, 2026, the FDA also required a new warning about a rare eye condition, NAION, for all GLP-1 medicines, tirzepatide included.

Tirzepatide is the medicine in Zepbound (weight loss and sleep apnea) and Mounjaro® (type 2 diabetes). Below: label rates and what helps, how to tell common from serious, how long side effects last, and short answers to the questions people ask most. If you use compounded tirzepatide, for example through MaxLife, watch for these warning signs too, and take your questions to your prescriber.

What Are the Most Common Side Effects of Tirzepatide?

The most common side effects of tirzepatide (Zepbound, Mounjaro) are nausea, diarrhea, vomiting, constipation, stomach pain, indigestion, injection site reactions, tiredness, allergic reactions such as rash, burping, hair loss and heartburn. Each was reported by at least 5% of people taking Zepbound in two placebo-controlled weight-loss trials lasting up to 72 weeks, SURMOUNT-1 and SURMOUNT-2. The ranges cover the 5 mg, 10 mg and 15 mg doses.

Source: Zepbound prescribing information, Table 1. Gas and bloating (3% to 4% vs 2%) and low blood pressure (1% to 2% vs 0%) were also more common than on placebo.

Taken together, stomach side effects affected 56% of people on each Zepbound dose and 30% on placebo. Most were mild to moderate. Severe stomach side effects were reported in 1.7% to 3.1% of people on Zepbound (1% on placebo), and 1.9% to 4.3% stopped treatment because of stomach side effects (0.5% on placebo).

Mounjaro's diabetes trials reported lower rates of similar reactions: nausea in 12% to 18% of people on 5 mg to 15 mg vs 4% on placebo, diarrhea 12% to 17% vs 9%, decreased appetite 5% to 11% vs 1%, vomiting 5% to 9% vs 2% and constipation 6% to 7% vs 1% (Mounjaro prescribing information). The people, doses and trial lengths differ, and both labels warn that rates from different trials can't be compared directly. For tiredness in detail, see does tirzepatide make you tired; for skin reactions and site rotation, see where to inject tirzepatide.

Which Tirzepatide Side Effects Are Serious?

Serious side effects of tirzepatide are uncommon, but the labels list several that need a same-day call to your provider or emergency care. The difference from the common ones is intensity and persistence: mild queasiness after a dose increase is expected; stomach pain that is severe and won't go away is not.

Sources: the Zepbound Medication Guide and the FDA's November 2026 safety communication.

These events were rare in the trials. In the Zepbound weight-loss trials, confirmed pancreatitis occurred in 0.2% of people on Zepbound and 0.2% on placebo. Gallstones were reported in 1.1% vs 1%, gallbladder inflammation in 0.7% vs 0.2% and gallbladder removal in 0.2% vs none. Acute kidney injury occurred in 0.5% vs 0.2%, and severe allergic reactions in 0.1% vs none. Since approval, reports have also included severe and sometimes fatal pancreatitis, bowel obstruction, severe constipation with impaction, and kidney failure that sometimes needed dialysis.

For vomiting, MedlinePlus advises getting medical care if you have been vomiting for more than 24 hours, can't keep fluids down for 12 hours or more, haven't urinated in 8 hours, or have vomited 3 or more times in a day. Two more label points: tell every provider before surgery or sedation, because tirzepatide slows stomach emptying and leftover food can get into the lungs under anesthesia; and don't use tirzepatide if you or a family member has had medullary thyroid carcinoma (MTC) or you have MEN 2. Alcohol adds to several of these risks, including low blood sugar, pancreatitis and dehydration; see tirzepatide and alcohol.

How Long Do Tirzepatide (Zepbound) Side Effects Last?

Most tirzepatide side effects are strongest in the weeks around a dose increase and then fade, but no label gives an exact number of days. The Zepbound and Mounjaro labels say most nausea, vomiting and diarrhea happened while the dose was being raised and decreased over time. In the SURMOUNT trials, stepping up to the top dose took 20 weeks, and an analysis of SURMOUNT-1 to -4 found that stomach side effects were mostly mild to moderate, happened mainly in that period and diminished over time (Diabetes, Obesity and Metabolism, 2025). The three-year SURMOUNT-1 results showed that pattern again through week 176 and reported no new safety signals (NEJM, 2025).

When Do Zepbound Side Effects Start?

Side effects can begin after the first dose or after any dose increase. Tirzepatide reaches its highest blood level about 24 hours after a shot (anywhere from 8 to 72 hours), and its slowing of stomach emptying is strongest after the first dose and fades over time, according to the Zepbound label. That is why the label starts everyone at 2.5 mg once a week for 4 weeks and raises the dose in 2.5 mg steps no sooner than every 4 weeks: the slow climb is meant "to reduce the risk of gastrointestinal adverse reactions." Our tirzepatide dosage chart shows the full schedule.

What About Day-by-Day Timelines?

Precise timelines you may see online, such as nausea lasting 1 to 3 days after each shot, don't come from the Zepbound or Mounjaro label or the trial reports we reviewed. Your own pattern is a better guide: note when symptoms start after each shot and how long they last, and share that with your provider.

Stopping because of side effects was uncommon in the trials: 4.8% to 6.7% of people on Zepbound stopped for any side effect vs 3.4% on placebo, mostly in the first few months and mostly for stomach problems. If you do stop, tirzepatide leaves your body gradually: its half-life is about 5 to 6 days, so it takes several weeks to clear.

How Can You Ease Tirzepatide Side Effects?

Most tirzepatide side effects respond to simple changes in how you eat and drink, and to a slower pace if your provider agrees. These tips come from the labels, the trial investigators and federal health sites:

• Eat smaller meals and stop when you feel full. SURMOUNT investigators suggest splitting meals, avoiding fatty foods and choosing bland foods when your stomach is upset. Our GLP-1 diet guide has meal ideas.
• Keep drinking. The Medication Guide says drinking fluids helps lower your chance of dehydration. If you are vomiting, MedlinePlus suggests small amounts of clear liquids, often.
• Ease constipation with fiber (22 to 34 grams a day for adults, says NIDDK), plenty of water and other liquids, and regular physical activity.
• Swallow less air to cut down on burping: eat slowly and skip gum and fizzy drinks (more in the sulfur burps section below).
• Rotate injection sites and inject only into healthy skin.
• Ask about the pace. The label lets your prescriber keep you at a dose longer or choose a lower maintenance dose if you don't tolerate a higher one, and the trial investigators list temporary medicines for nausea or diarrhea as another option. Those are your provider's calls, so don't change your dose on your own.

Does Tirzepatide Cause Headaches?

Headache is not listed as a common side effect on the Zepbound or Mounjaro label, but two things tirzepatide can cause are known to bring one on. Neither label's main table of reactions that happened more often than on placebo includes headache. The Zepbound Medication Guide does list headache as a sign of low blood sugar, and MedlinePlus lists it among the signs of dehydration, which nausea, vomiting and diarrhea can cause.

What helps: drink fluids through the day, and if you take insulin or a sulfonylurea, check your blood sugar when a headache starts. Ask your provider or pharmacist which pain reliever is safe for you. Call 911 for a sudden, explosive or "worst ever" headache, or one that comes with slurred speech, vision changes, weakness or confusion (MedlinePlus).

What Causes Sulfur Burps on Tirzepatide?

Burping is a listed side effect of tirzepatide, and "sulfur burps" is the name people use when burps smell like rotten eggs. Burping was reported by 4% to 5% of people on Zepbound vs 1% on placebo, and by 2.5% to 3.3% on Mounjaro vs 0.4%. The trials counted all burping together and didn't track the smell. Tirzepatide slows how fast your stomach empties, so food stays there longer, and NIDDK notes that an unpleasant gas odor may be due to sulfur.

To ease it, NIDDK suggests eating more slowly and sitting down to eat; avoiding gum, hard candy, straws and fizzy drinks; eating smaller, more frequent meals; and cutting back on foods that give you more gas, such as broccoli, cauliflower, beans and lentils, or sugar-free products with sweeteners whose names end in "-ol." Call your provider if burping comes with severe stomach pain or vomiting.

Can Tirzepatide Cause Anxiety or Depression?

The evidence says no. On January 13, 2026, the FDA asked the makers of Zepbound, Wegovy® and Saxenda to remove the warning about suicidal thoughts and behavior from their labels. Its review of 91 placebo-controlled trials with 107,910 patients found no increased risk of suicidal thoughts or behavior, or of anxiety, depression, irritability or psychosis. The Zepbound label removed the warning in February 2026; GLP-1 medicines for type 2 diabetes, such as Mounjaro, didn't carry it.

Two things still matter. The Medication Guide lists anxiety, irritability and mood changes among the signs of low blood sugar, so check your blood sugar if you take insulin or a sulfonylurea. And the FDA still asks people to tell a health care professional about new or worsening depression, suicidal thoughts, or unusual changes in mood or behavior. If you are in crisis, call or text 988.

Does Tirzepatide Cause Body Aches?

Body aches are not a listed side effect of Zepbound or Mounjaro. A few listed effects can feel like aches: the label's fatigue figure includes malaise and weakness, injection sites can be sore, and dehydration from stomach side effects can cause muscle cramps (MedlinePlus). Fluids and regular meals help with the last of these. Don't dismiss aches that come with a fever and pain in your upper stomach, because the Medication Guide lists that combination as a possible sign of gallbladder problems. Tell your provider about aches that last or come with a fever.

Can Tirzepatide Cause Low Blood Sugar?

Yes, but serious lows are uncommon unless you also take insulin or a sulfonylurea. In the Zepbound trial of adults with type 2 diabetes (SURMOUNT-2), 4.2% had blood sugar below 54 mg/dL vs 1.3% on placebo, and the rate was 10.3% among people also taking a sulfonylurea vs 2.1% among those who weren't. In the trial of adults without diabetes, 0.3% had a reading that low. Signs include dizziness, sweating, shakiness, confusion or drowsiness, a fast heartbeat, hunger, headache, blurred vision, irritability and weakness.

If you have diabetes, the label says your blood sugar should be checked before and during treatment, and your insulin or sulfonylurea dose may need to be lowered. NIDDK's advice for a low is to have 15 grams of fast-acting carbohydrate, such as four glucose tablets or half a cup of juice, and check again after 15 minutes.

Can Tirzepatide Raise Your Heart Rate?

Yes, slightly. In the Zepbound weight-loss trials, heart rate rose by 1 to 3 beats per minute on average, with no rise on placebo. In Mounjaro's diabetes trials it rose by 2 to 4 beats per minute vs 1 on placebo, and episodes of a fast heart rhythm with a jump of 15 beats per minute or more were reported in 4.6% to 10% of people, rising with the dose, vs 4.3% on placebo. The label calls the clinical relevance of these increases uncertain.

A racing heart can also be a sign of low blood sugar, severe dehydration or an allergic reaction. Tell your provider about a heartbeat that feels fast at rest, and get emergency care if it comes with fainting, chest pain or trouble breathing.

Can Tirzepatide Cause Sinus Problems?

Sinus congestion and sinus infections are not listed side effects of Zepbound or Mounjaro. The word "sinus" does appear on the Mounjaro label, in "sinus tachycardia," but that is a heart term for a faster-than-normal heartbeat (see the heart rate section above), not a nose or sinus problem. If you have a stuffy nose, facial pressure or sinus pain while taking tirzepatide, talk to your provider about other causes.

Can Tirzepatide Cause Low Iron?

Low iron is not a listed side effect of tirzepatide, but researchers have started to look for it. A 2026 review of six studies covering 480,825 adults found that people taking GLP-1 medicines had 26% to 30% lower ferritin, a measure of stored iron, than people taking another type of diabetes medicine (SGLT2 inhibitors), and that more than 60% ate less iron than recommended (Clinical Obesity, 2026). The studies were observational, so they can't show that the medicines caused it. Another 2026 review called iron deficiency uncommon on these medicines and named eating less, slower stomach emptying and less stomach acid as likely reasons (Nutrients, 2026).

Signs of iron deficiency anemia include feeling weak or tired, headaches, dizziness and a pounding or racing heartbeat (MedlinePlus). If you notice them, or you have heavy periods, ask your provider about a blood test such as ferritin and a complete blood count before you start iron pills.

Can Tirzepatide Cause Kidney Stones?

Kidney stones are not a listed side effect, and trial data for tirzepatide don't show a higher risk. A 2025 analysis of 15 randomized tirzepatide trials with 14,471 people found no increase in kidney stones compared with placebo, insulin or other GLP-1 medicines (World Journal of Diabetes, 2025). A large 2025 study of US veterans with diabetes did link GLP-1 medicines as a group to more kidney stones than usual care, but it was observational (Nature Medicine, 2025).

Fluids are the part you control. NIDDK says drinking enough liquid, mainly water, is the most important thing you can do to prevent kidney stones, which matters when nausea or a smaller appetite cuts how much you drink. See a health care professional right away for sharp pain in your back, side or groin, or blood in your urine.

Does Tirzepatide Cause Hair Loss?

Yes, in a small share of people: hair loss was reported by 4% to 5% of people on Zepbound vs 1% on placebo. The label says it was associated with weight reduction and was more common in women (7.1%) than in men (0.5%); on placebo the rates were 1.3% and 0%. No one on Zepbound stopped treatment because of it. Tell your provider if you notice more shedding than usual.

Can Tirzepatide Affect Your Eyes or Vision?

It may, rarely. On November 9, 2026, the FDA required new warnings about non-arteritic anterior ischemic optic neuropathy (NAION) on the labels of all GLP-1 medicines, including Zepbound and Mounjaro. NAION is a rare condition that causes sudden, painless loss of vision in one eye, and the loss can be permanent. In the FDA's analysis of 126 trials with 134,253 patients, 15 probable cases occurred: 10 in people taking a GLP-1 medicine and 5 on placebo, or 6.4 vs 3.8 cases per 100,000 person-years. As of November 2026, the Zepbound and Mounjaro labels on DailyMed have not yet been updated.

Get medical care right away for sudden vision loss, blurred or missing areas of vision, or color changes in one eye, often noticed on waking. The FDA lists smoking, diabetes, high blood pressure, sleep apnea, anemia and kidney disease as risk factors. Separately, the Zepbound label says people with type 2 diabetes and a history of diabetic retinopathy should be monitored, because fast improvement in blood sugar can temporarily worsen it.

Does Tirzepatide Cause Cancer?

It isn't known whether tirzepatide causes cancer in people. Zepbound and Mounjaro carry a boxed warning, the FDA's strongest type of label warning, because tirzepatide caused thyroid C-cell tumors in rats; the label says it is unknown whether it causes these tumors, including medullary thyroid carcinoma, in humans. Don't use tirzepatide if you or a family member has had MTC or if you have MEN 2. Tell your provider about a lump or swelling in your neck, hoarseness, trouble swallowing or shortness of breath.

Are Tirzepatide Side Effects Different for Women?

The labels don't report most side effects separately for women and men, but a few points apply to women. Most people in the Zepbound weight-loss trials (63%) were women, so the rates above largely reflect women's experience. Hair loss was more common in women (7.1% vs 0.5% in men). Tirzepatide can make birth control pills work less well: the label advises switching to a non-oral method, or adding a barrier method, for 4 weeks after starting and for 4 weeks after each dose increase. Zepbound may harm an unborn baby, so tell your provider if you are pregnant, plan to become pregnant or are breastfeeding.

What Are the Long-Term Side Effects of Tirzepatide?

The longest trials so far run about three to four years, and they haven't shown new long-term problems. In SURMOUNT-1's three-year results for adults with obesity and prediabetes, side effects were mostly mild to moderate stomach symptoms in the first 20 weeks, and the investigators reported no new safety signals through week 176 (NEJM, 2025). In SURPASS-CVOT, adults with type 2 diabetes and heart disease took Mounjaro for a median of about four years (210 weeks); side effects were similar to earlier trials, apart from decreased appetite (17%), constipation (13%), vomiting (12%), stomach pain (10%) and fatigue (10%) (Mounjaro prescribing information). What isn't known yet: effects beyond about four years, and whether the thyroid tumors seen in rats matter for people.

Does Compounded Tirzepatide Have Different Side Effects?

Nobody has measured it. Compounded tirzepatide is prepared by a licensed pharmacy for one patient's prescription and is not FDA-approved, which means the FDA hasn't reviewed it for safety, effectiveness or quality. The rates in this article come from trials of Zepbound and Mounjaro and have not been studied for compounded tirzepatide. The FDA reports that as of May 31, 2026, it had received more than 730 reports of adverse events linked to compounded tirzepatide, that many "appear to be consistent with" those of the FDA-approved versions, and that the true number is likely higher because most pharmacies aren't required to report them.

The risk that is specific to compounded tirzepatide is dosing. The FDA has received reports of side effects, some needing hospital care, that may be related to dosing errors with compounded semaglutide, such as patients drawing up the wrong amount or providers miscalculating a dose, and reports tied to compounded semaglutide or tirzepatide prescribed at doses or increases beyond the approved label. In an August 12, 2026 letter to state medical boards, the FDA warned that compounded vials often come in different concentrations than the brand, so dose volumes are not interchangeable. In its example, a vial holding 17 mg per mL needs 0.15 mL for a 2.5 mg dose. Read both the mg and the mL on your pharmacy label, ask your provider or pharmacist to show you how to measure, and never convert a dose from a brand pen yourself.

How MaxLife Helps You Manage Side Effects

Side effects are easier to handle when a provider is following your dose and your symptoms. MaxLife is a telehealth patient management platform, not a pharmacy. You complete an online intake that takes about 2 minutes, an independent licensed provider reviews it, usually within 24 hours, and if the provider decides compounded tirzepatide is right for you, a licensed partner pharmacy prepares and dispenses it. Ongoing medical support is free: if side effects bother you, tell your provider, who reviews how you're doing and decides whether to change your plan, for example by keeping you at a dose longer. You can ask for a video visit, and the team speaks Spanish.

Compounded tirzepatide through MaxLife is $120 a month, flat, the same price at every dose, so a slower pace or a lower dose doesn't change what you pay. The price includes the provider's review and follow-up, the medicine if prescribed, supplies and free expedited shipping, with no membership fee, and HSA or FSA funds may be eligible. If your insurance covers Zepbound or Mounjaro, the brand may cost you less, so compare first: 24 online tirzepatide providers compared by real cost. And if your side effects are under control but the scale isn't moving, see why you may not be losing weight on tirzepatide.

The Bottom Line

Tirzepatide's common side effects are mostly digestive, and they tend to come with dose increases and fade with time. Serious problems such as pancreatitis, gallbladder disease, kidney injury from dehydration and severe allergic reactions are rare but need prompt care, and in November 2026 the FDA added a rare eye condition, NAION, to the warnings for all GLP-1 medicines. Headaches, body aches, sinus problems, low iron and kidney stones are not on the label; when they happen, look at fluids, blood sugar and how much you're eating. Keep a simple log of your symptoms, and talk to your provider before you change anything.