Wegovy® pill vs. injection side effects: What are the differences?

Over the past few years, Wegovy® has become one of the most talked-about prescription options for weight loss. It contains semaglutide, the same medication as Ozempic. For many years it has been available as an injection for weight loss and a few other approved uses. At the end of 2025, Wegovy® was also approved as a pill, becoming the first oral GLP-1 medication FDA-approved for weight loss.

That has given people another way to take semaglutide without an injection. But it raises a very practical question: Does the way you take it change the side effects you might experience on it?

If you’re choosing between the pill and the injection, after weight loss results, potential side effects are probably high on your list of concerns. 

Let’s compare Wegovy® pill side effects to the injection side by side, look at what the clinical trial numbers show, explain what causes these symptoms, and share tips that can help. We’ll also cover what to know about the rare but serious risks worth knowing about, and whether they differ between the two. 

Why do the pill and injection cause similar side effects?

Since the pill and the injection trigger the same receptors, it makes sense that they share most of the same side effects. Both forms contain semaglutide, which activates GLP-1 receptors. The main difference is how the medication gets into your body and how often you take it. Once the medication reaches those receptors, a few things happen:

• In the stomach: Digestion slows down, which can keep you feeling full longer. This can be a reason for nausea, bloating, and constipation.
• In the brain: Appetite signals quiet down, which can make you want to eat less. Eating less, along with dehydration from digestive symptoms, can contribute to fatigue, headaches, and dizziness.

Learn more: What is Wegovy®? Exploring the weight loss benefits, side effects, and cost

Wegovy® pill vs. injection side effects: What to expect

Because the pill and the injection both contain semaglutide, the side-effect profiles are largely the same. The most common symptoms for both are digestive: nausea, vomiting, diarrhea, constipation, and stomach pain. These effects tend to be most noticeable when you first start treatment or move up a dose, and they often ease as your body adjusts. Both medications are started low and increased gradually to lower the risk of side effects. 

The key differences:

• Injection site reactions can happen with the injection but not with the pill.
• Nausea, vomiting, and indigestion/heartburn were reported slightly more often with the pill in clinical trials.
• Diarrhea and stomach pain were reported more often with the injection.
• The higher dose Wegovy® HD (7.2 mg injection) can come with higher rates of most digestive side effects and a more noticeable jump in a side effect called dysesthesia.

Let’s go through this in more detail.

Wegovy® pill vs. injection: Side effect comparison

The Wegovy® pill and injections have many of the same potential side effects, but how often they were reported varied across clinical trials. Here’s a side-by-side look at how often people reported each side effect in clinical trials. The pill numbers come from the OASIS 4 trial of the 25 mg pill. The injection numbers come from the STEP 1, STEP 2, and STEP 3 trials of the 2.4 mg injection, which are summarized in the Wegovy® prescribing information.

Side effect	Wegovy® pill (25 mg)	Wegovy® injection (2.4 mg)
Nausea	47%	44%
Vomiting	31%	24%
Diarrhea	18%	30%
Constipation	20%	24%
Stomach pain/discomfort	9%	20%
Indigestion/heartburn	18% / 8%	9% / 5%
Headache	12%	14%
Fatigue	7%	11%
Dizziness	5%	8%

Note: These numbers come from separate clinical trials, so they aren’t a perfect head-to-head comparison. Your own experience may look different, and your provider can help you set realistic expectations.

Key differences in side effects: Wegovy® pill vs. Wegovy® injection

The pill and injection share many of the same side effects, but the percentages above show some differences in how often they were reported. The pill numbers come from a ⁠clinical trial of the 25 mg Wegovy® pill, while the injection numbers are pooled from clinical trials of the 2.4 mg dose and reported in the ⁠Wegovy® prescribing information. Because the pill and injection weren’t compared head-to-head in the same trial, these numbers can show us patterns, but they can’t tell us for sure that one form is more likely to cause a particular side effect.

Here’s what stands out:

• Nausea and vomiting were reported more often with the pill. Nausea was reported by ⁠47% of people taking the 25 mg pill versus ⁠44% with the 2.4 mg injection. The difference was larger for vomiting: ⁠31% with the pill versus ⁠24% with the injection.
• Diarrhea and constipation were reported more often with the injection. Diarrhea was reported by ⁠30% of people using the 2.4 mg injection compared with ⁠18% taking the pill. Constipation was closer, at ⁠24% with the injection and ⁠20% with the pill.
• Abdominal pain was also reported more often with the injection. About ⁠20% of people using the 2.4 mg injection reported abdominal pain or discomfort, compared with ⁠9% taking the pill.
• Indigestion and heartburn went the other direction. Indigestion was reported by ⁠18% of people taking the pill versus ⁠9% with the injection, while heartburn was reported by ⁠8% versus 5%, respectively.
• Other common side effects were fairly close. Headache was reported by ⁠12% of people taking the pill and ⁠14% using the injection, while fatigue was reported by 7% and 11%, and dizziness by 5% and 8%, respectively.

There are also a few differences that come down to how you take the medication:

• Injection-site reactions are specific to the injection. People using Wegovy® injections may experience redness, itching, swelling, or mild pain where the medication is injected. The pill doesn’t have this issue because there’s no injection.
• The pill has more specific timing requirements. It needs to be taken first thing in the morning on an empty stomach with no more than about 4 ounces of plain water. You then need to wait at least 30 minutes before eating, drinking, or taking other medications. Following these instructions matters because oral semaglutide can be difficult to absorb.
• The injection offers more flexibility. Wegovy® injections are taken once a week and can be given at any time of day, with or without food.

And then there’s Wegovy® HD. The 7.2 mg dose uses the same once-weekly injection as standard Wegovy®, but increasing the dose changes the side effect picture in a few notable ways.

What about Wegovy® HD vs. Wegovy® pill side effects? 

Wegovy® HD is a higher-dose version of the Wegovy® injection. It delivers 7.2 mg of semaglutide once a week, compared with 2.4 mg for the standard maintenance dose. It’s designed for people who have already worked up to 2.4 mg and may benefit from additional weight loss. It’s available as an injection only, so there is no higher-dose pill.

With this higher dose, average weight loss in trials was 18.7%, which is more comparable to Zepbound® (tirzepatide). 

How does its side effect profile compare with the Wegovy® pill? 

Overall, the same types of side effects show up with both, but the comparisons are from two different studies, not a head-to-head comparison. The Wegovy HD information comes from the STEP UP trial, and the Wegovy pill data are from the OASIS 4 trial. 

• Nausea was reported by 39% of people taking Wegovy® HD compared with 47% in the pill trial, while vomiting was reported by 22% versus 31%. 
• Constipation was very similar at 20% with both. 
• Abdominal pain was reported by 12% with Wegovy® HD versus 9% with the pill. 
• Headache, fatigue, and dizziness were also reported at fairly similar rates.

These percentages shouldn’t be used to conclude that the pill causes more side effects than Wegovy® HD. The two forms were studied in separate trials, so differences in the people enrolled and how the studies were conducted can affect the numbers.

One side effect does stand out with Wegovy® HD: dysesthesia, an umbrella term for unusual or altered skin sensations, such as tingling, burning, sensitivity, or a pins-and-needles feeling. It was reported by 22% of people taking 7.2 mg. A comparable percentage wasn’t reported in the pill study used for the table above, so we can’t directly compare the two.

The bigger takeaway is that moving from the pill to an injection—or to the higher-dose injection—doesn’t introduce an entirely different set of common side effects. Digestive symptoms remain the ones you’re most likely to see, but the frequency and some less common effects can differ depending on the form and dose.

Read more: Dysesthesia: What to know about the Wegovy® 7.2 mg side effect

Wegovy® pill vs. injection: How dosing can lower the severity of side effects

Side effects like nausea, vomiting, diarrhea, constipation, and stomach discomfort are most common when you first start Wegovy® or increase your dose. That’s one reason you don’t start at the full dose. Both the Wegovy® pill and injection use a gradual step-up approach designed to give your body time to adjust and reduce the risk of digestive side effects.

The biggest difference is timing. The Wegovy® pill is taken once a day, while the injection is taken once a week. You’ll also notice that the pill doses are much higher. That’s because semaglutide is difficult for the body to absorb when taken by mouth—only a small amount typically makes it into the bloodstream. The pill contains an absorption enhancer called SNAC, which helps semaglutide pass through the stomach lining, but a higher dose is still needed to deliver enough medication. How you take the pill also matters for absorption. ⁠Learn more about how to take the Wegovy® pill and why timing matters.

Here’s how dosing compares:

	Wegovy® pill	Wegovy® injection
How often you take it	Once daily	Once weekly
Starting dose	1.5 mg	0.25 mg
How often the dose can increase	At least every 30 days, based on tolerance and response	At least every 4 weeks, based on tolerance and response
Dose progression	1.5 mg → 4 mg → 9 mg → 25 mg	0.25 mg → 0.5 mg → 1 mg → 1.7 mg → 2.4 mg → 7.2 mg*

*The 7.2 mg dose is an option for some adults who have tolerated 2.4 mg and may benefit from additional weight loss.

How to manage Wegovy® side effects: Pill and injection

Most people have at least some mild side effects during the first few weeks or after a dose increase. Here’s what’s most common and what can make you feel better:

Symptom	What can help
Nausea	Eat smaller, low-fat meals and avoid greasy or spicy foods
Vomiting	Stick to bland foods like rice or applesauce and sip fluids slowly
Constipation	Drink more water, add fiber gradually, and stay active
Diarrhea	Stay hydrated and consider lower-fiber foods temporarily
Indigestion / heartburn	Eat slowly and avoid lying down right after meals
Headache	Drink more water and take breaks from screens
Stomach pain/discomfort	Rest your stomach with light meals or clear liquids if needed
Fatigue	Prioritize rest, balanced meals, and light movement
Dizziness	Stay hydrated and stand up slowly

Wegovy pill vs. injection: Safety and serious side effects and warnings

The Wegovy® pill and injections share the same serious warnings because they contain the same active ingredient, semaglutide. The reassuring part is that serious side effects are much less common than nausea, vomiting, constipation, and other digestive symptoms. In clinical trials, for example, ⁠fewer than 1% of people experienced pancreatitis or acute kidney injury, while gallstones affected about 1.6% of people using the injection and 2.5% of people taking the pill.

And while common side effects can be uncomfortable, most people were able to stay on treatment. About ⁠7% of people taking either the 25 mg pill or the 2.4 mg injection stopped treatment because of side effects—6.9% with the pill and 6.8% with the injection. With the injection, nausea, vomiting, and diarrhea were the most common side effects that led people to stop treatment.

Here are the more serious risks and the signs to know:

• Pancreatitis: This is inflammation of the pancreas and was rare in clinical trials. The main sign is severe stomach pain that doesn’t go away and may spread to your back. Nausea or vomiting can happen too.
• Gallbladder problems: Gallstones and gallbladder inflammation can occur with Wegovy®. Signs include pain in the upper abdomen, fever, yellowing of the skin or eyes, or pale or clay-colored stools.
• Kidney problems: Kidney problems were also uncommon in trials. The risk can increase if vomiting or diarrhea causes you to become severely dehydrated. Signs can include urinating less than usual or swelling in your legs or feet.
• Low blood sugar: This is mainly a concern for people with type 2 diabetes who also take insulin or certain other medications that lower blood sugar. Signs include shaking, sweating, dizziness, weakness, confusion, blurred vision, or a fast heartbeat.
• Vision changes: Semaglutide can worsen diabetic eye problems in some people with type 2 diabetes. Let your provider know if you notice new or worsening changes in your vision.
• Severe allergic reactions: These are uncommon but require immediate medical attention. Signs include swelling of the face, lips, tongue, or throat; difficulty breathing or swallowing; fainting; or a severe rash.

Boxed warning: Wegovy® also carries an FDA boxed warning about a possible risk of thyroid C-cell tumors. These tumors have been seen in animal studies, but it isn’t known whether Wegovy® causes them in people. Wegovy® shouldn’t be used by people with a personal or family history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia syndrome type 2 (MEN 2).

Who shouldn’t take the Wegovy® pill or injection?

Because both forms contain semaglutide, most of the same restrictions apply. You shouldn’t take Wegovy® if:

• You or someone in your family has had medullary thyroid carcinoma (MTC). This is a rare type of thyroid cancer.
• You have multiple endocrine neoplasia syndrome type 2 (MEN 2). This is a rare inherited condition that increases the risk of certain tumors, including MTC.
• You’ve had a serious allergic reaction to semaglutide or another ingredient in Wegovy®.
• You’re pregnant. Wegovy® isn’t recommended for weight loss during pregnancy.

Talk with your provider before taking Wegovy® if:

• You’re planning to become pregnant. Wegovy® should be stopped at least two months before a planned pregnancy because semaglutide takes time to leave the body.
• You’re breastfeeding or plan to breastfeed. Recommendations can differ between the pill and injection, so talk with your provider about which options are appropriate.
• You have a history of pancreatitis or gallbladder problems. Your provider can help you weigh your individual risks and benefits.
• You have diabetes, especially if you take insulin or other medications that lower blood sugar. Your medications may need to be monitored or adjusted.
• You have diabetic retinopathy or other diabetes-related eye problems. Tell your provider about your eye history and report any changes in vision.
• You have kidney problems or frequently become dehydrated. Vomiting and diarrhea can cause fluid loss, which can sometimes worsen kidney problems.

Your provider should also know about all medications and supplements you take before you start Wegovy®, since semaglutide slows stomach emptying and may affect how some oral medications are absorbed.

FAQ about Wegovy pill side effects vs injection

Do side effects go away?

For most people, yes. Digestive symptoms are usually most noticeable at the start of treatment and after each dose increase, and they tend to fade as your body adjusts. 

Nausea is the most common, but it usually doesn’t last forever. In ⁠research involving more than 2,000 people taking semaglutide 2.4 mg, episodes typically lasted about eight days. 

If you’re still feeling off after several weeks, or if symptoms are severe or getting worse, check in with your provider. They can help you figure out what’s going on and whether a change would help.

Does oral Wegovy have fewer side effects?

The side-effect profiles are largely similar. The pill had somewhat higher rates of nausea, vomiting, and indigestion/heartburn, while the injection had higher rates of diarrhea and stomach pain and can also cause injection site reactions. With the higher dose of Wegovy, people are more likely to experience dysesthesia. 

Does the Wegovy® pill upset the stomach?

Nausea and stomach discomfort are common with both forms of semaglutide, especially when you start or increase your dose. 

Which is safer: the Wegovy® pill or injection?

Both are FDA-approved and considered safe for treating the conditions that they apply to. Both contain some risks, as mentioned above and stated in the PI. Safety profiles are similar because both contain semaglutide. For most people, the difference comes down to which form fits their routine. Your provider can help you decide.

Is the Wegovy® pill as effective as the Wegovy® injection?

Results are very close. On average, people lost about 14% of their body weight with the pill in the OASIS 4 trial and about 15% with the injection in the STEP 1 trial, alongside healthy lifestyle changes. With the higher dose injection, people have seen an average of about 18.7% of body weight loss. 

Does the Wegovy® pill make you feel different than the shot?

The symptoms are mostly the same, because both contain semaglutide. Everyone’s experience can be different, but some people may feel better without the potential for injection site reactions. 

The bottom line: Wegovy® pill vs. injection side effects are similar

The Wegovy® pill and injection have a lot more in common than they do differences. Both use semaglutide, both cause mostly digestive side effects like nausea, vomiting, diarrhea, and constipation, and for most people those effects are mild and fade as the body adjusts.

The differences are small but real. The pill had somewhat higher rates of nausea, vomiting, and indigestion/heartburn. The injection had higher rates of diarrhea and stomach pain, and it’s the only form that can cause injection site reactions. Since these numbers come from separate trials, treat them as a guide, not a guarantee.

If you’re considering the higher-dose Wegovy® HD injection, expect a bit more of the usual digestive side effects and a notably higher chance of dysesthesia, in exchange for greater average weight loss. Whether that trade-off is worth it is a personal decision to make with your provider.

If you’re thinking about switching, consider whether you’d rather manage a daily morning routine or a weekly pen, and talk with your provider about your health history. If side effects are severe, don’t improve, or worry you, reach out to your provider.

If you’re thinking about medication support for weight loss, Noom Med can help you explore your options. If you qualify, you’ll be paired with a clinician who can help you build a plan that pairs medication, if appropriate, with habits that support long-term progress. See if you qualify for Wegovy® through Noom Med.