When you are starting a new weight loss programme, one of the first questions you may ask is how quickly you will notice a difference. At Sudbury Court Pharmacy, we offer a range of prescription treatments, including Mounjaro, Wegovy, Saxenda, and Orlistat. Each works in a different way, and the speed at which results appear can vary from person to person. Understanding these differences can help you make an informed choice about which option may be right for you.
How Quickly Does Mounjaro Work?
Mounjaro is a once-weekly injectable medication that helps to regulate appetite and improve blood sugar control. Many patients notice a reduced appetite within the first week, which can make it much easier to stick to a calorie deficit.
Weight loss results with Mounjaro can begin as early as two to four weeks, with some people losing between 3 and 6 kilograms in the first month. However, results depend heavily on lifestyle factors, including diet quality and physical activity. While appetite suppression starts quickly, the most significant results are typically seen after several months of consistent use.
Mounjaro is particularly effective for people who struggle with portion control or frequent hunger, as it helps make long-term calorie management more achievable.
How Quickly Does Wegovy Work?
Wegovy is another once-weekly injectable weight loss medication. Like Mounjaro, it works by targeting hormones that control appetite, making it easier to feel full on smaller portions.
Patients often report a noticeable reduction in hunger within the first week. Weight loss results can begin within the first month, although initial changes are sometimes smaller compared to Mounjaro. On average, many people lose between 2 and 4 kilograms in the first four weeks.
The speed of results also depends on how well patients tolerate the medication and whether they gradually increase the dose as directed. Wegovy tends to build its effects over time, with significant progress visible within three to six months.
How Quickly Does Saxenda Work?
Saxenda is a daily injectable medication that works in a similar way to Wegovy but is administered more frequently. Many patients notice appetite changes within the first week, and steady weight loss can follow shortly after.
Average results in the first month range from 2 to 4 kilograms, though this can vary. Some people find that daily dosing helps them feel more in control of their progress, while others prefer the convenience of weekly injections like Mounjaro or Wegovy.
Saxenda can be a good choice for those who want consistent, daily reinforcement of appetite control, but it requires more commitment to regular injections.
How Quickly Does Orlistat Work?
Orlistat works differently from Mounjaro and Wegovy. It does not affect appetite but instead reduces the amount of fat your body absorbs from the food you eat. This means it works immediately from the first dose, but the visible results may take longer to appear compared to injectable medications.
Average weight loss with Orlistat is around 1 to 2 kilograms per month when combined with a calorie-controlled, low-fat diet. The rate of progress can feel slower, but it remains a useful option for those who prefer an oral treatment or who cannot use injectable medications.
Patients using Orlistat need to be aware that eating high-fat meals can cause unpleasant digestive side effects, including diarrhoea. The most consistent results come from pairing the medication with a balanced, reduced-fat eating plan.
Comparing the First Month of Results
When looking at how quickly these weight loss drugs work, Mounjaro and Wegovy often lead in terms of first-month results, particularly for those who struggle with appetite control. Saxenda follows closely, with Orlistat generally producing slower but steady results.
The most important thing to remember is that medication is only part of the equation. Diet, exercise, and lifestyle changes play a significant role in determining how much weight you lose and how quickly it happens.
Choosing the Right Option
The right choice depends on your health needs, preferences, and weight loss goals. At Sudbury Court Pharmacy, we provide private weight loss services in London, offering in-depth consultations to determine the most suitable treatment for each individual. This may involve considering factors such as medical history, current medications, lifestyle, and preferred method of administration.
We also provide ongoing support to help you make the necessary lifestyle changes alongside your chosen medication, ensuring you get the best possible results.
Finding the Right Balance for You
If you are wondering “How quickly does Mounjaro work?”, the answer is that results can be seen in as little as two to four weeks, often ahead of other weight loss treatments. However, all weight loss medications work best when combined with a balanced diet, regular activity, and ongoing support.
At Sudbury Court Pharmacy, we help patients find the right balance between effective medication and sustainable lifestyle changes. Whether you are interested in Mounjaro, Wegovy, Saxenda, or Orlistat, we can guide you through your options and provide professional care every step of the way. Get in touch or book an appointment today.

This blog was written on behalf of Sudbury Court Pharmacy and Travel Clinic by Pharmacy Mentor.