Your second week on Wegovy: what's normal, what's not, and what changes

The myth that week two should feel transformative — and what's actually happening

Many people arrive at week two having read about significant appetite suppression and expect their hunger to have all but disappeared. In reality, 0.25 mg is a tolerability dose. Novo Nordisk designed it that way deliberately: the goal of the first four weeks is to reduce the intensity of gastrointestinal side effects as your system gets used to semaglutide, not to deliver peak pharmacological effect. Full appetite suppression accumulates across months of titration, not days.

The NHS medicines page for semaglutide is clear that treatment takes time to work and that side effects are most noticeable at the start. That framing matters. If week two feels underwhelming compared to what you read online, your treatment is probably progressing exactly as it should.

For a closer look at the specific changes and sensations you can reasonably anticipate as the second week unfolds, our guide to what to expect in week 2 of Wegovy walks through the detail day by day. What you might notice instead: a slight reduction in the urge to snack between meals, food feeling a little heavier than usual, and your appetite returning faster than expected at some meals but not others. These are real, early signals. They are not the full effect. Keep going.

Side effects most people actually report in week two

Nausea is the most talked-about side effect, and it is genuinely common in weeks one and two. It tends to peak in the first day or two after an injection, then ease off before the next dose. Loose stools, constipation, indigestion and burping also appear in this window. Most people find these settle considerably by weeks three and four, particularly if they eat smaller portions, avoid high-fat meals, and stay well hydrated.

Fatigue and mild headaches are also reported in week two, though less discussed. These usually reflect the body adapting to reduced food intake and the medicine's effect on gastric emptying. For practical detail on early side effects and what they indicate, the first-week Wegovy experience guide covers the full picture of how days one to seven typically unfold, which provides useful context for judging what's changed.

One thing worth understanding: side effects in week two do not predict how you'll tolerate the medicine long-term. Some people feel rough for a fortnight and then find higher doses entirely manageable. If symptoms are severe or you're unable to keep fluids down, contact your prescriber rather than waiting.

What the scale is doing, and why it's misleading right now

Some people see a drop of two to four pounds in week two. Others see nothing, or a fluctuation. Neither outcome tells you much about what the next three months hold. Early weight change on GLP-1 medicines frequently reflects water and glycogen shifts rather than fat loss, because reduced carbohydrate intake (a natural consequence of eating less) prompts the body to release stored glycogen, each gram of which carries roughly three grams of water.

The full timeline for how long Wegovy takes to work explains this in detail: meaningful and sustained weight reduction typically becomes visible after the first dose increase, and the trial results that inform NICE's recommendation (published in the STEP 1 trial in the New England Journal of Medicine) were measured over 68 weeks, not 68 days.

The practical advice is to weigh weekly at the same time of day rather than daily, and to track trend lines rather than individual readings. Week two is not the test. It is the prologue.

Practical habits that make week two easier

Protein and hydration are the two levers most within your control right now. Prioritising protein at each meal reduces muscle loss during calorie restriction and tends to improve satiety, even on a modest dose. Aiming for adequate fluid intake matters doubly if you're experiencing loose stools or nausea-driven reduced appetite.

Injection timing is worth settling into a consistent routine now, the same day each week, the same time of day. Some people find morning injections suit them; others prefer evenings. The pen itself is straightforward: pre-filled, single-use, and requires refrigeration. If you started through a regulated pharmacy service, tracking your delivery via DPD and noting the plain, unbranded packaging it arrived in is a reassuring reminder that your supply chain is verified. Store the pen in the fridge door and take it out 30 minutes before injecting to reduce injection-site discomfort.

For a broader picture of what the coming weeks hold, the week-five guide is a useful forward reference, because week five is typically when many people experience the first real appetite shift after the dose steps up. If you're considering the cost of ongoing treatment, the Wegovy pricing page sets out what a transparent, all-inclusive private prescription actually covers. And if you want to read the full overview of how Wegovy works before your next dose, the general Wegovy expectations guide covers the complete arc from first injection through to maintenance.

If you haven't yet started and are trying to understand what you'd be signing up for, checking your eligibility takes a few minutes and is reviewed the same day by a real prescriber.