In the UK, the issue of obesity is more pressing than ever, with an increasing number of people looking for effective weight loss management.
While diet and exercise are the foundation of weight management, some people can’t achieve their weight loss goals with these methods alone. This has increased interest in prescription weight loss treatment as a supplementary solution.
Using OpenPrescribing, we found that in the last 12 months alone, the NHS has prescribed over 560,088 drugs for the treatment of obesity. Weight loss tablets offer a helping hand in the journey towards a healthier weight, providing an additional tool for those struggling to see results.
Weight loss pills are designed to support your weight loss journey. Unlike weight loss supplements, these drugs go under more rigorous testing and regulation, aiming to provide a safe and effective aid alongside a healthy diet and exercise.
They are mainly geared towards those who have struggled to achieve enough weight loss through lifestyle changes alone, whether prescribed by healthcare professionals or purchased over the counter.
Their primary goal is to help you manage your weight, making the path to a healthier lifestyle more accessible for those who face challenges with traditional weight loss methods.
These weight loss tablets increase the feeling of fullness and reduce overall calorie intake. They also interact with the body’s natural hunger signals or neurotransmitters in the brain, which are responsible for appetite control, making it easier for people to consume fewer calories without feeling deprived.
Certain weight loss tablets are designed to inhibit the body’s ability to absorb fat from the food you eat. They can effectively reduce the calories you absorb from meals by blocking the enzymes that break down fat for absorption, which is then eliminated from the body in the stool – creating a deficit necessary for weight loss.
Some weight loss capsules aim to increase the body’s metabolic rate, which is the rate at which the body burns calories. These are also known as ‘fat burners’. By boosting metabolism, these medications help people lose body weight more efficiently throughout the day, even at rest.
This can contribute to faster, but healthy weight loss when combined with a change in diet and regular exercise.
Like all medicines, weight loss pills have side effects, though many people take them without any issues. The most common side effects are temporary digestive changes like loose stools or needing to go to the toilet more often. These usually improve as the body adjusts to the treatment.
Depending on the different types of weight loss tablets, some people notice changes in their eating patterns or feel more energetic than usual. While less common, some may experience headaches or trouble sleeping when first starting treatment.
To minimise any side effects, you should:
If side effects persist when taking weight loss medication as directed, speak to your GP or prescriber.
| Tablets | Unbranded Orlistat | Alli | Xenical | Mysimba | Rybelsus | Wegovy Tablets |
| Active Ingredient | Orlistat 120mg | Orlistat 60mg | Orlistat 120mg | Naltrexone 8mg + Bupropion 90mg | Semaglutide 2mg / 7mg / 14mg | Semaglutide 1.5mg / 4mg / 9mg / 25mg |
| Prescription Required | Yes | No (OTC) | Yes | Yes | Yes | Yes (not yet available in the UK) |
| Mechanism of Action | Blocks fat absorption | Blocks fat absorption | Blocks fat absorption | Reduces appetite and food cravings | Regulates blood sugar and makes you feel fuller for longer | Reduces appetite and slows gastric emptying, helping you feel fuller for longer |
| Fat Blocked | ~30% | ~25% | ~30% | N/A | N/A | N/A |
| Dosage | 1 capsule with each meal containing fat, up to 3 times daily | 1 capsule with each meal containing fat, up to 3 times daily | 1 capsule with each meal containing fat, up to 3 times daily | Up to 4 tablets daily | 1 tablet a day, 30 minutes before food | 1 tablet daily, taken on an empty stomach with a small amount of water |
| Average Weight Loss | 10% of starting weight in 1 year | 5% of starting weight in 1 year | 10% of starting weight in 1 year | 5-10% of starting weight after 56 weeks | 4% of starting weight in 26 weeks | ~13.6% of starting weight at 64 weeks |
| Suitable For (By Body Mass Index) | BMI ≥30 or ≥28 with weight-related health risks | BMI ≥28 | BMI ≥30 or ≥28 with weight-related health risks | BMI ≥30 or ≥27 with weight-related health risks | Those with type 2 diabetes (licensed use) or BMI of 27 ≥ with at least one weight-related health risk (unlicensed use) | BMI ≥30, or ≥27 with at least one weight-related health condition |
| Common Side Effects of Weight Loss Tablets | Oily stools, abdominal pain, diarrhoea | Oily stools, abdominal pain, diarrhoea | Oily stools, abdominal pain, diarrhoea | Nausea, constipation, headache, vomiting | Nausea, vomiting, and diarrhoea | Nausea, vomiting, and diarrhoea |
| Duration of Use | Up to 6 months (longer with doctor’s advice) | Up to 6 months | Up to 6 months (longer with doctor’s advice) | Long-term use possible under medical supervision | Long-term use possible under medical supervision | Long-term use possible under medical supervision |
Orlistat is one of the most widely recognised and prescribed weight loss medications available in the UK, known for its effectiveness in helping users shed excess pounds.
Orlistat works by inhibiting the enzyme lipase, which is necessary for the breakdown and absorption of dietary fats.As a result, a portion of the fat you’ve eaten isn’t digested and is excreted from the body, helping you lose weight.
Orlistat is available in several different versions:
While Orlistat can effectively help with weight loss, there are potential side effects like gastrointestinal discomfort and other digestive issues – especially after high-fat meals. These effects are generally mild and can be minimised by maintaining a healthy lifestyle alongside a low-fat diet.
Prolonged-release tablets are a weight loss medication designed to release their active ingredients slowly, with benefits like stable blood levels and potentially fewer side effects.
Mysimba targets the two brain areas that regulate food intake and energy consumption. It contains a combination of naltrexone and bupropion, which helps reduce appetite and control cravings.
The prolonged-release formulation of Mysimba allows for a gradual increase in dosage, helping to minimise side effects as the body adjusts to the medication. Those taking this medication should follow a calorie-reduced diet and exercise regularly to achieve the best weight loss results.
The benefits of prolonged-release tablets like Mysimba include improved patient adherence to the medication regimen, as fewer daily doses are easier to remember and manage. The steady release of medication can also lead to a better patient experience, as it avoids the peaks and troughs in blood concentration associated with immediate-release formulations.
Mysimba is not exempt from side effects, including nausea, constipation, headache, dizziness, and dry mouth. More serious but less common side effects include increased blood pressure or heart rate, which may require monitoring within specialist weight management services.
Rybelsus (semaglutide) is an oral medication in the GLP-1 receptor agonist class, the same family as popular weight loss injections. As a tablet form of this medication, Rybelsus offers a needle-free alternative for those who prefer not to use injections, with benefits including weight loss and improved blood sugar control.
Rybelsus works by mimicking the GLP-1 hormone that naturally occurs in your body after eating, helping to regulate blood sugar levels and creating a feeling of fullness that reduces appetite. By slowing down stomach emptying, Rybelsus helps you feel satisfied for longer after meals, naturally reducing your overall food intake.
While Rybelsus is primarily licensed for managing type 2 diabetes, healthcare professionals may consider it for weight management in people with a BMI 27+ who have at least one weight-related health condition, like high blood pressure.
Users of Rybelsus typically experience a gradual weight loss that they can maintain with continued use under medical supervision. Like other weight loss medications, Rybelsus works best when combined with a healthy, balanced diet and regular physical activity.
Common side effects include digestive issues such as nausea, vomiting, and diarrhoea, which often improve as your body adjusts to the medication. Taking Rybelsus as directed – on an empty stomach with a small amount of water and waiting 30 minutes before eating – helps maximise its effectiveness to get the best results and reduce the likelihood of side effects.
The Wegovy pill is the first oral GLP-1 receptor agonist approved for weight management, though it’s currently only available in the US. UK approval is pending and is anticipated to become available towards the end of 2026.
Like Rybelsus, the Wegovy tablet contains semaglutide and works by mimicking the GLP-1 hormone to suppress appetite, slow gastric emptying, and reduce overall food intake. Unlike Rybelsus, which is licensed for type 2 diabetes management, the Wegovy pill has been developed and approved specifically for weight management in adults with obesity or overweight.
The tablet is taken once daily on an empty stomach with a small amount of water, following a gradual titration schedule that begins at 1.5mg and increases to a maintenance dose of 25mg.
Side effects are consistent with others in the GLP-1 class, primarily nausea, vomiting, and diarrhoea, which tend to ease as the body adjusts to the medication. The Wegovy pill is intended to be used alongside a reduced-calorie diet and increased physical activity rather than as a standalone treatment.
For those interested in semaglutide-based weight loss treatment that is currently available in the UK, the Wegovy injection remains a licensed option, along with Rybelsus for those with type 2 diabetes.
Weight loss injections like Mounjaro, Wegovy and Saxenda mimic the action of the GLP-1 receptor hormone. This helps lower blood sugar levels and promotes a feeling of fullness for longer, reducing overall calorie intake and supporting weight loss.
There are some potential side effects, which range from mild gastrointestinal issues to more severe conditions like pancreatitis and gallbladder problems.
People might choose weight loss injections over tablets for their convenience and effectiveness. Injections often provide a more sustained release of medication, leading to potentially better appetite control and longer-lasting effects. Those who have difficulty adhering to a daily pill regimen may find the weekly or monthly injection schedule more manageable and less intrusive to their daily lives.
Some may prefer weight loss tablets over injections to avoid the anxiety associated with needles. Tablets can also offer more flexibility in dosage adjustments and are often seen as a less intimidating first step into medically assisted weight loss.
If you’re exploring weight loss tablets or other prescription weight loss medications, our team is ready to provide weight loss support and practical guidance. With our convenient online weight loss treatment clinic, accessing the support and treatments you need has never been easier.
Buy weight loss pills online with Click2Pharmacy and take the step to a healthier you by managing your weight effectively and safely.y and safely.
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