Wegovy Tablets: What Real Patients Can Expect in the First Month

Short answer: in your first month on Wegovy tablets you take one 1.5mg tablet a day, and the licence keeps you on that dose for at least a month before the step up to 4mg. Nausea, indigestion and constipation are the side effects to expect; in the OASIS 4 trial they were mostly mild to moderate and reported mainly while the dose was being increased. The first month is about the routine more than the scales, because the 25mg maintenance dose is reached at the earliest in your fourth month.

A note on this article: it's a pharmacist-written expectations guide, not a review. We don't publish patient testimonials or star ratings for prescription-only medicines. The dose steps and how to take Wegovy tablets come from the UK product information, and how common each side effect was comes from the OASIS 4 trial as that product information reports it. Individual results vary.

What happens in week 1 on Wegovy tablets?

You take your first 1.5mg tablet on an empty stomach, after fasting for at least 8 hours (for most people, first thing in the morning). Swallow it whole with a sip of plain water, up to 120ml, then wait at least 30 minutes before eating, drinking or taking other medicines by mouth. Our guide on how to take the Wegovy pill explains why the wait matters.

Nothing dramatic happens on day one. Semaglutide has a half-life of about a week, so it builds up gradually and takes 4 to 5 weeks of daily tablets to reach a steady level. Some people notice nausea, indigestion or a feeling of fullness in these early weeks; others notice very little.

How long does nausea last on Wegovy tablets?

The product information gives no average number of days. Over the 64 weeks of OASIS 4, nausea was reported by 46.6% of people on the tablets (18.6% on placebo), vomiting by 30.9% (5.9%) and diarrhoea by 17.6% (8.8%). Most of these were mild to moderate and of short duration, and they were reported most often while the dose was being increased. If yours is still going at the end of week two, or you cannot keep fluids down, message your pharmacist rather than pushing through.

Appetite may change too. Semaglutide acts on the areas of the brain that regulate appetite and food intake, so meals can feel smaller and snacking can pull less. How much, and how soon, varies from person to person.

Is constipation common on Wegovy tablets?

Yes. In OASIS 4, 20.1% of people on the tablets reported constipation, about 1 in 5, against 9.8% on placebo. It was mostly mild to moderate but tended to last longer than the other stomach side effects. Fluids, fibre and gentle movement usually manage it. Occasionally a mild laxative helps short term; ask your pharmacist which are safe.

Weight on the scales may still be quiet. Some people see a small drop; some don't. The first month is more about setting the routine than seeing a number.

When do you move up from 1.5mg to 4mg?

The licence keeps you on 1.5mg for at least one month, then steps up to 4mg, 9mg and 25mg, with at least a month at each. As the month ends, your pharmacist reviews you before the step up to 4mg. If side effects were still difficult, staying longer at a step is a normal choice, not a setback: the licence sets a minimum of a month at each dose, and says the dose can be kept at the previous step if needed.

In OASIS 4, adults with overweight or obesity who took 25mg once a day lost an average of 13.6% of their body weight over 64 weeks, compared with 2.2% on placebo, counting everyone who started treatment. Individual results vary. For how results build over the months, see Wegovy pill results week by week. For the full step-by-step, see the Wegovy tablets dosage schedule, and for what each step will cost you, see the UK Wegovy tablets cost breakdown.

How can you manage side effects in the first month?

• Nausea: smaller, blander meals; avoid greasy or very rich food; sip water between meals rather than with them.
• Constipation: aim for 1.5 to 2 litres of fluid a day, add fibre gradually, walk after meals.
• Vomiting or diarrhoea: keep sipping fluids, because losing fluid this way can lead to dehydration.
• Feeling weak or tired: listed as very common in the product information, mainly while the dose is increasing. Check you're eating enough, protein included, and see our guide to vitamins and supplements on Mounjaro and Wegovy.
• Indigestion: avoid lying down soon after meals; smaller meals help.

For every side effect listed for the tablets and how often each one happens, see oral semaglutide side effects and how to manage them.