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The daily pill uses the exact same science as the weekly injections, but taking a pill every morning is a completely different routine.
If you get any side effects, they'll mostly be temporary and manageable. Severe or troubling symptoms may require medical intervention. This guide breaks down exactly what to expect, when it might happen, and how to handle it.
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All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 16 April, 2026. GPhC Registration: 2221320View profile
Weight loss pills use the exact same science as the weekly injections. They target the parts of your brain that control your appetite, slowing down how quickly your stomach empties so you feel full sooner and think about food less.
The only real difference is how the medication gets into your body, not what it does once it's there.
Right now, the Wegovy pill is the only daily weight loss tablet available to patients in the UK. Other options are still being tested and developed, but they aren't ready yet.
Because the Wegovy Pill contains the same active molecule as the injection, the core side effect profile is broadly similar. What is different is how the medication reaches your bloodstream. The pill relies on a specific absorption mechanism that only works correctly on an empty stomach, with a precise amount of water, and a 30-minute wait before eating.
If you do get any side effects, they'll usually affect your stomach. Most of them are mild, and they're usually only at their worst during the first few weeks when your body is getting used to a new dose.1
| Common side effects (mild to moderate)¹ | Serious but rare side effects¹ |
|---|---|
| Stomach upset: Nausea, vomiting, diarrhoea, constipation, and bloating are mild to moderate in the majority of people in clinical trials. This is a result of the medication slowing down how fast your stomach empties. | Severe, persistent stomach pain: If you experience severe pain in your stomach area that travels through to your back, with or without persistent vomiting, stop taking the medication and seek emergency medical care immediately. This can be a sign of pancreatitis (an inflamed pancreas). |
| Headache and fatigue: Some people feel mild dizziness, headaches, or tiredness early on. These are usually temporary adjustments. | Severe dehydration: If you experience severe vomiting or diarrhoea and cannot keep fluids down, contact your clinical team. Severe dehydration can damage your kidneys. |
| Burping and metalic taste: You may notice a bitter taste or more burping an hour or two after taking the pill. This is normal and means the pill's protective coating is working in your stomach. | Allergic reactions: Seek immediate care if you experience swelling of the face, lips, or throat, or difficulty breathing. |
Because weight loss pills use the exact same science as the weekly injections, the side effects are pretty much the same. The only difference is how the medication gets into your body, not what it does once it's there.
If you do get any side effects, they'll usually affect your stomach. Most of them are mild, and they're usually only at their worst during the first few weeks when your body is getting used to a new dose.1 Below are the other ways in which they differ.
Burping and metallic aftertaste
Within one to two hours of taking the tablet, some people notice they're burping more than usual. Some also describe a metallic or bitter taste in the mouth around the same time.1 Both are caused by an important ingredient in the pill - SNAC - altering the stomach environment, meaning they're a sign the tablet is doing what it needs to do to be absorbed.1
More prominent heartburn
Injectable semaglutide can cause heartburn too, but oral semaglutide tends to produce more of it. Two mechanisms combine: SNAC temporarily alters the stomach environment, and GLP-1's effect of slowing down how quickly your stomach empties food.
Day to day variability
Because absorption depends on the daily protocol being followed precisely, you may notice that some days feel different from others in ways that do not happen with a once-weekly injection.1 If you had coffee before the 30-minute window was up, or took the tablet with more than the specified amount of water, or had something to eat too soon, you may have effectively absorbed a lower dose that morning.
Broadly similar GI profile
Nausea, constipation, and diarrhoea follow the same general pattern as injectable semaglutide: most prominent early in treatment, most troublesome at dose increases, and generally improving as the weeks pass.
No injection site reactions
The most obvious difference is that there's no needle, no injection site bruising, redness, or discomfort.
What side effects does the Wegovy Pill cause?
The Wegovy Pill is oral semaglutide, which is the same molecule as the Wegovy injection, just in tablet form. The most commonly reported side effects are nausea, diarrhoea, and vomiting which are mostly mild to moderate. You might also notice burping and a slightly metallic taste in the first hour or two after taking it. Both fade within a few weeks for most people.1
Wegovy Pill side effects in women
There's no meaningful difference in side effects between men and women. Some people find that nausea feels worse at certain points in their cycle, though this isn't something the clinical research has nailed down yet for the oral form specifically. The pill isn't suitable during pregnancy or breastfeeding, and must be stopped at least 2 months before trying to conceive. If any of that is relevant to you, it's worth having that conversation with your clinician before you start.2
When do Wegovy Pill side effects start?
Most people notice something in the first week. Side effects are most pronounced early on, with a brief return each time your dose increases, which is normal and usually short-lived. Most GI side effects settle noticeably within 4–8 weeks.
Long-term side effects of the Wegovy Pill
The longest trial data runs to about 68 weeks, so the long-term picture is still developing.1 The main things to be aware of are gallbladder-related issues and heart health, though on the heart side, evidence from injectable semaglutide is reassuring, showing a meaningful reduction in serious cardiovascular events. Everyone on Numan's programme is monitored by a clinician throughout.
Weight loss pills are new enough that real-world guidance is still catching up, but the science behind them isn't. That means a lot of what works for the injections applies here too.
The strategies below are based on what we know from existing evidence and how our clinical team interprets the data that's currently available. If these steps don't work for you, we'll adjust your dose, timing, or overall approach.
Follow the protocol
Take the tablet on an empty stomach with no more than120ml of plain, still water. Wait 30 minutes before eating or drinking anything else. This is directly responsible for how much drug you absorb and how much nausea you experience.
Stay upright
Do not take the tablet and immediately lie down. Sitting or standing for at least 30 minutes after dosing may reduce both heartburn and the likelihood of acid reflux.
Eat small and slow
When you do eat after the fasting window, small meals eaten slowly are far less likely to cause nausea than large or fast ones.
Stay hydrated
Dehydration significantly worsens nausea and constipation. Aim for 2–2.5 litres daily.
Try ginger
Ginger has some evidence in helping alleviate nausea, and is safe to use alongside GLP-1 medications.
Avoid high-sulphur foods
If burping is bothering you, the foods that tend to worsen it are worth avoiding in the hours around your dose: eggs, cabbage, broccoli, Brussels sprouts, onions, and garlic are the main culprits.
Additional medications
If symptoms like heartburn or altered bowel habits are persistent despite trying various lifestyle changes, then an additional medication may be needed to manage the symptoms. Talk to your GP about this should that be the case for you.
Light movement
Gentle movement helps get your bowels moving and is one of the most effective things you can do for constipation. You just need to not sit still for extended periods if your bowels are sluggish.
Visit a pharmacist
A pharmacist can help with most side effects that don't resolve on their own.
Oral GLP-1 medications are prescription-only in the UK. This isn't about access, but because the right medication, at the right dose, with the right support, gets better outcomes than going it alone. Numan's clinical team assesses your suitability, reviews your history, and if oral GLP-1 medication is the right fit. If it isn't, other options are on the table too.
We don't judge your history
Whether you've tried medication before, stopped and started, or come to this after years of other approaches, your clinical team's job is to support what comes next.
Prescription based on you, not a formula
Eligibility isn't just a BMI number. Your full health picture, including medications, conditions, and lifestyle, is part of how the clinical team assesses what's right for you.
Ongoing support
Starting oral semaglutide means daily dosing, regular check-ins, and a clinician who can adjust your plan if something isn't working. The prescription is the beginning, not the end.
Other options if oral isn't right for you
Injectable GLP-1s remain an option. The clinical team helps you find the right fit, and there's no pressure to commit to a route before you've had that conversation.
Side effects don't mean stopping
Most side effects are manageable, and your clinician can help you work through them. Adjusting approach is always on the table before discontinuing.
Set your own pace
Dose titration follows a schedule, but your clinical team can slow it down if you need more time to adjust. There's no prize for rushing.
Confidential, clinical, judgement-free
Everything you discuss with Numan's clinical team stays between you and them. The only thing they're focused on is your outcome.
Danielle Brightman
Clinical Director
MPharm PgDip PCert
Zoe Griffiths
VP of Behavioural Medicine
BSc (Hons) RD SCOPE
Victoria Rogers
Head of AI Coaching and Behavioural Science
MSc BSc
Dr Tsolmon Tsogbayar
Senior Clinical Product Lead
MBBS MSc
Dr Michael Lacey
Numan Doctor
MBChB BSc (Hons) MRCGP
Dr Dimitris Schizas
Numan Doctor
MBBS MRCGP MSC BSSM
Wharton S, Lingvay I, Bogdanski P, Duque do Vale R, Jacob S, Karlsson T, et al. Oral semaglutide at a dose of 25 mg in adults with overweight or obesity. N Engl J Med. 2025;393(11):1077–87.
Prescribing Information. Wegovy.com. [accessed 11 June 2026] Available from: https://www.wegovy.com/prescribing-information.html
Medically reviewed:
Burping and metallic aftertaste
Within one to two hours of taking the tablet, some people notice they're burping more than usual. Some also describe a metallic or bitter taste in the mouth around the same time.1 Both are caused by an important ingredient in the pill - SNAC - altering the stomach environment, meaning they're a sign the tablet is doing what it needs to do to be absorbed.1
More prominent heartburn
Injectable semaglutide can cause heartburn too, but oral semaglutide tends to produce more of it. Two mechanisms combine: SNAC temporarily alters the stomach environment, and GLP-1's effect of slowing down how quickly your stomach empties food.
Day to day variability
Because absorption depends on the daily protocol being followed precisely, you may notice that some days feel different from others in ways that do not happen with a once-weekly injection.1 If you had coffee before the 30-minute window was up, or took the tablet with more than the specified amount of water, or had something to eat too soon, you may have effectively absorbed a lower dose that morning.
Broadly similar GI profile
Nausea, constipation, and diarrhoea follow the same general pattern as injectable semaglutide: most prominent early in treatment, most troublesome at dose increases, and generally improving as the weeks pass.
No injection site reactions
The most obvious difference is that there's no needle, no injection site bruising, redness, or discomfort.
Danielle Brightman
Clinical Director
MPharm PgDip PCert
Zoe Griffiths
VP of Behavioural Medicine
BSc (Hons) RD SCOPE
Victoria Rogers
Head of AI Coaching and Behavioural Science
MSc BSc
Dr Tsolmon Tsogbayar
Senior Clinical Product Lead
MBBS MSc
Dr Michael Lacey
Numan Doctor
MBChB BSc (Hons) MRCGP
Dr Dimitris Schizas
Numan Doctor
MBBS MRCGP MSC BSSM
