The first six months of weight loss treatment are the most important part of your journey. 

This is the period when your body adjusts to the medication, when most early side effects appear and settle, and when the foundations of long-term, sustainable weight loss are laid down. 

Knowing what to expect at each stage helps you stay the course, manage symptoms confidently, and get the most out of your treatment.

This guide walks you through a typical six-month timeline on GLP-1 weight loss injections such as Wegovy (semaglutide) and Mounjaro (tirzepatide), with notes on tablet-based options like Orlistat. 

It also explains how titration works and what you can do alongside your medication to support your results.

Before you start: how titration works

GLP-1 medications are always introduced gradually using a process called titration. 

You begin on a low ‘starter’ dose for about four weeks, then your prescriber steps you up to the next strength if you are tolerating it well. 

This phased approach allows your stomach and appetite to adapt, and it significantly reduces the intensity of side effects.

Wegovy follows a five-step schedule: 0.25mg, 0.5mg, 1mg, 1.7mg and then 2.4mg as the standard maintenance dose, with each step usually lasting four weeks. 

Mounjaro begins at 2.5mg, increasing to 5mg, 7.5mg, 10mg, 12.5mg and a maximum of 15mg, again moving up no sooner than every four weeks. 

Orlistat does not require titration; the standard 120mg dose is taken three times a day with main meals.

Month 1: settling in

Your first month is about your body adjusting to the medication rather than rapid weight loss. 

On the starter dose you are unlikely to notice a dramatic change in appetite straight away, but most people start to feel fuller sooner during meals within the first two to three weeks.

Early side effects are most common in this phase. You may experience nausea, mild stomach upset, constipation, occasional diarrhoea, tiredness or headaches. 

These are almost always temporary and tend to ease within seven to ten days. 

Eating smaller portions, avoiding very fatty or spicy food, staying well hydrated and not lying down straight after meals can all help. 

Average weight loss in month one is typically around 2 to 3% of your starting body weight.

Months 2 and 3: dose escalation and early results

By the end of month one you will usually move up to the next dose. 

Many people notice a clearer reduction in appetite at this point, smaller cravings between meals and a more natural sense of fullness. This is also when meaningful weight loss usually starts to become visible.

Each dose increase can briefly bring back mild side effects, particularly nausea, for a few days while your body adjusts. 

This is normal and usually short-lived. By the end of month three most people taking Wegovy will be approaching the 1.7mg dose, while Mounjaro users may be on 7.5mg or 10mg. 

Average total weight loss at this stage is often in the region of 5 to 8% of starting body weight, though responses vary. 

Orlistat users on a low-fat, calorie-controlled diet may see similar steady losses of around 1 to 2lb per week.

Months 4 to 6: reaching maintenance and building momentum

Between months four and six most patients reach their maintenance dose. 

For Wegovy that is typically 2.4mg weekly; for Mounjaro it may be 5mg, 10mg or 15mg depending on tolerance and response. 

At this stage side effects are usually mild or have resolved entirely.

This is often the most rewarding stretch of the journey. 

Appetite is well controlled, eating habits feel calmer and more in tune with hunger, and the cumulative weight loss becomes clearly visible. 

By the six-month mark, average losses are often in the region of 10 to 15% of starting body weight on a GLP-1 medication, with some patients losing more. 

Orlistat users who have stayed consistent with diet and activity typically see a loss of 5 to 10% by six months. 

Your prescriber will review your progress regularly and may adjust the dose, hold it steady, or in rare cases recommend stopping if a dose is not well tolerated.

Managing side effects across the six months

Side effects are at their most noticeable during the first month and around each dose increase, and far less common once you reach your maintenance dose. The general principles for managing them stay the same throughout:

  • Eat smaller meals and stop as soon as you feel comfortably full.
  • Keep meals lower in fat and avoid heavy, greasy or very sweet foods.
  • Drink water regularly through the day to ease nausea and prevent constipation.
  • Contact your prescriber if symptoms become severe, do not settle, or you experience persistent abdominal pain.

How to support your weight loss journey

Medication does much of the heavy lifting on appetite and cravings, but lasting results depend on what you do alongside it. 

Aim to build a small set of sustainable habits from day one rather than overhauling everything at once.

  • Prioritise protein at every meal to protect muscle and keep you fuller for longer.
  • Build up to 150 minutes of moderate activity each week, including some resistance work to maintain muscle mass.
  • Aim for seven to nine hours of sleep – poor sleep increases appetite hormones.
  • Track your weight weekly rather than daily, and note non-scale wins such as better energy, looser clothes and improved fitness.
  • Stay in regular contact with your clinician, especially around dose increases or if anything feels off.

Start your journey with onlinemeds

At onlinemeds we specialise in weight loss treatment. 

Our UK-registered pharmacist prescribers will assess your eligibility, recommend the most suitable medication, guide you through every step of the titration schedule, and provide the ongoing support that makes the first six months a success.

Check your eligibility today and take the first confident step on your weight loss journey.