What Happens in Week 1

  • First injection administered on day 1 following prescriber guidance
  • Body begins adjusting to the weekly injectable treatment during days 1-3
  • Some patients may notice initial appetite changes by days 3-5
  • Week 1 focuses on establishing your injection routine and monitoring initial response
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Height 175 cm
Weight 82 kg
Your BMI
26.8
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Free · BMI thresholds shown are illustrative. Final eligibility is confirmed by a UK prescriber during your free consultation.
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Which route suits you

Two clinically backed paths to results

A weekly GLP-1 injection or a daily capsule — each fully overseen by our UK pharmacy team, with no obligation to continue.

Treatment
Avg. weight loss
05%10%15%20%25%
Availability
Injection
Weekly pen · GLP-1
Avg. weight loss
~20%up to
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Daily tablet · Oral GLP-1
Avg. weight loss
~17%up to
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Prices update live and may change. The live table below always takes precedence.
All treatment is subject to a prescriber consultation and clinical approval.

Your First Week Journey with Mounjaro

Day 1: Your First Mounjaro Injection Experience

The first day of Mounjaro treatment begins after completing your online clinical assessment and receiving approval from a UK-licensed prescriber. Your first injection marks the start of a structured, clinician-led weight management approach designed to support your lifestyle changes. Following the guidance provided by your healthcare professional, you'll administer your first weekly dose as part of your comprehensive treatment plan.

On day 1, many patients feel a mixture of anticipation and uncertainty about beginning this prescription medicine. Your prescriber will have provided specific instructions for your first injection, and it's important to follow these carefully. The injection itself is administered once weekly, and establishing this routine from day 1 helps create consistency throughout your treatment journey.

During your first day, focus on following the preparation steps outlined by your healthcare professional. Take time to review all guidance materials and ensure you understand the process completely. Remember that this prescription-only medicine has been prescribed specifically for you following individual clinical assessment, and your prescriber has determined it may be suitable for your circumstances.

Days 2-3: Initial Body Response Period

During days 2 and 3 of your first week, your body begins responding to the weekly injectable treatment. Mounjaro works by acting on natural hormones involved in appetite regulation and digestion, and this process starts developing during these early days. Some patients may begin noticing subtle changes, while others may not observe significant differences yet - both experiences are normal during week 1.

These initial days are important for monitoring how you feel and noting any changes in your usual patterns. The medicine is designed to support weight management alongside your reduced-calorie diet and increased physical activity, so maintaining these lifestyle elements remains essential during days 2-3. Your body is adjusting to the treatment, and this adjustment period varies between individuals.

Like all prescription medicines, Mounjaro may cause side effects, and days 2-3 represent a period when some patients might notice initial responses. These effects vary between individuals, and not everyone experiences them. If you have any concerns during these early days, contact your healthcare professional for guidance rather than making assumptions about what you're experiencing.

Days 4-5: Appetite and Digestive Changes

By days 4-5 of your first week, some patients may notice changes related to appetite regulation and digestion. Mounjaro influences natural hormones that help regulate feelings of hunger and fullness, and these effects may become more apparent during the middle of week 1. However, individual responses vary significantly, and some patients may not notice pronounced changes during their first week.

The medicine may influence how quickly food leaves the stomach, which some people notice during days 4-5. This can manifest as feeling fuller after meals or experiencing changes in your usual eating patterns. These responses are part of how the treatment is designed to support your weight management efforts alongside dietary modifications and increased physical activity.

During days 4-5, continue following your reduced-calorie diet plan as recommended by your prescriber. The medicine is intended to support, not replace, your lifestyle efforts. Some patients find that maintaining consistent meal times and choosing nutrient-dense foods helps them navigate any changes they experience during this period of their first week.

Days 6-7: Completing Your First Week

Days 6 and 7 represent the conclusion of your first week with Mounjaro treatment. By this point, you've established your weekly injection routine and experienced your body's initial response to this prescription medicine. The end of week 1 provides an opportunity to reflect on your experience and prepare for continuing treatment as directed by your healthcare professional.

Some patients may notice that appetite changes become more established by days 6-7, while others may still be in the early adjustment phase. Both experiences are normal during week 1, as individual responses to prescription medicines vary considerably. The important factor is following guidance from your prescriber and maintaining the lifestyle changes that form the foundation of your weight management approach.

Completing your first week represents an important milestone in your treatment journey. You've successfully administered your first injection, observed your body's initial response, and maintained your commitment to the lifestyle modifications that support long-term weight management success.

Managing Side Effects During Week 1

During your first week, you may experience side effects as your body adjusts to Mounjaro treatment. Like all prescription medicines, this weekly injectable treatment may cause side effects, though not everyone experiences them. Common side effects may include gastrointestinal symptoms, and some people may experience nausea, reduced appetite, or digestive discomfort during week 1.

Side effects vary between individuals, and their intensity and duration differ from person to person. Many patients find that side effects, if they occur, are most noticeable during the first week as their body adjusts to the treatment. Maintaining proper hydration and following your prescribed eating plan can help manage any discomfort you might experience.

If you experience concerning or severe symptoms during week 1, seek medical advice promptly. Contact your healthcare professional if side effects persist or worsen, rather than attempting to manage them independently. Your prescriber can provide specific guidance based on your individual circumstances and treatment response.

Establishing Your Weekly Routine

Week 1 is crucial for establishing the weekly injection routine that will continue throughout your treatment. Consistency in timing and approach helps create habits that support long-term treatment success. Choose a day and time that works well with your schedule, as you'll continue this weekly pattern as directed by your prescriber.

Creating a systematic approach during week 1 helps ensure you're prepared for each subsequent injection. This includes organizing your supplies, preparing your injection site, and following the specific guidance provided by your healthcare professional. Establishing these habits during your first week creates a foundation for successful ongoing treatment.

Remember that this prescription-only medicine requires ongoing clinical supervision. Your prescriber may schedule follow-up assessments to monitor your progress and ensure treatment continues to be appropriate for your circumstances. Week 1 begins this supervised treatment journey that combines medicine with lifestyle modifications.

Lifestyle Integration During Days 1-7

Throughout your first week, maintaining your reduced-calorie diet and increased physical activity remains essential. Mounjaro is designed to support weight management alongside these lifestyle changes, not replace them. Week 1 represents the beginning of integrating medical treatment with behavioral modifications for comprehensive weight management support.

Some patients find that changes in appetite or digestion during week 1 actually support their dietary goals. The medicine may help reduce feelings of hunger or support feeling fuller after meals, which can assist with portion control when combined with your prescribed eating plan. However, conscious effort to maintain healthy eating patterns remains important.

Physical activity continues to play a vital role during week 1 and beyond. While you're adjusting to the medicine, maintaining your exercise routine as recommended by your healthcare professional supports overall treatment effectiveness. Long-term weight management depends on the combination of medical treatment and sustained lifestyle changes.

What Week 1 Tells You About Treatment

Your first week provides initial insights into how your body responds to Mounjaro treatment, though it's important to understand that week 1 represents just the beginning of your treatment journey. Some patients notice immediate changes, while others require several weeks to experience the full effects of this prescription medicine. Both patterns are normal and don't predict long-term treatment success.

Week 1 responses don't determine whether treatment will be effective for your individual weight management goals. The medicine works gradually, and the full benefits typically develop over time with continued use alongside lifestyle modifications. Your healthcare professional will monitor your progress over multiple weeks to assess treatment effectiveness.

Use week 1 as a learning experience about your body's response patterns and an opportunity to establish successful treatment habits. The insights gained during these first seven days help inform discussions with your prescriber about your ongoing treatment plan and any adjustments that might optimize your weight management approach.

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GLP-1, now in adaily pill

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How treatment works

How GLP-1 treatments help

Reduces appetite

Helps you feel fuller, sooner — so portions naturally shrink.

Curbs cravings

Quietens food noise so snacking and cravings ease off.

Slows digestion

Food stays in your stomach longer, steadying hunger between meals.

Steady blood sugar

Supports more stable glucose levels through the day.

Is GLP-1 treatment right for you?

GLP-1 medicines are powerful and prescription-only for good reason. They suit many people very well — and they aren’t appropriate for everyone. Here’s a clear, honest picture before you decide.

You may be suitable

Criteria met
BMI of 30 or higher
BMI of 27+ with weight-related conditions
Struggled to lose weight with diet alone
Ready to pair with lifestyle changes

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Potential risk
Pregnant, trying to conceive, or breastfeeding
History of certain thyroid cancers
Certain pancreatic or digestive conditions
Under the age of 18

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Trusted by thousands

Real people, real change

Hannah M.
Lost 2 st 4 lb in a year

“The cravings that used to run my evenings just quietened down. Having a pharmacist to message made it feel safe.”

David O.
Lost 3 st in a year

“Discreet, simple and genuinely supportive. The dose steps were explained clearly every time.”

Priya S.
Lost 1 st 9 lb in a year

“I finally feel like food isn’t the loudest thing in my head. The delivery was always discreet and on time.”

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