How Often Can You Inject Semaglutide — and Why the Schedule Matters

Is once a week really enough, or should you inject more often?

It is a fair question. When you are used to medicines you take every day, a once-weekly injection can feel like it might not be doing enough. Semaglutide is designed specifically for this pattern. It has a half-life of roughly seven days in the body, which means a single injection maintains a stable level in your system across the whole week. Injecting again before seven days have passed would not produce a stronger effect, it would simply stack the dose in a way the medicine is not calibrated for, and the prescriber who sets your schedule would not sanction it.

The licensed use in the UK is clear: one injection per week. The titration schedule (starting at 0.25 mg and moving upward through 0.5 mg, 1.0 mg, 1.7 mg, and 2.4 mg) exists to let your body adjust gradually, reducing the GI side effects that many people notice in the early weeks. Those steps happen at roughly four-weekly intervals, on clinical review, not because you feel ready to move up. For a fuller picture of how the injection routine works in practice, our guide to injecting semaglutide covers technique, sites and storage.

A question our prescribers hear fairly regularly: what if you forget a dose? If you remember within five days of the missed injection, you can take it and then resume your usual weekly day. If more than five days have passed, skip it entirely and continue from your next scheduled date. Never inject twice in one week to make up for a missed dose, your Patient Information Leaflet covers this in full, and your prescriber is the right person to ask if you are unsure.

Which days and times work best for a weekly injection?

There is no clinically superior time of day. Morning, evening, before a meal, after one, all are acceptable. The only rule worth following is consistency: pick a day that is easy to remember and stick to it. Many people tie it to a routine that already exists, whether that is a Sunday evening or a Wednesday lunchtime. The day can be changed if needed, as long as the gap between injections stays at least five days.

Injection sites are worth rotating even if the frequency is low. Abdomen, thigh and upper arm are all licensed sites; moving between them from week to week reduces the chance of localised skin reactions. More detail on injection sites and rotation is on a dedicated page if you want to go deeper on this.

On the practical side: Wegovy arrives refrigerated, in a plain, unbranded box with DPD tracking so you know exactly when it lands. Each pen needs to stay in the fridge between uses, exact temperature and room-temperature storage limits are in the Patient Information Leaflet, and those figures are the ones to follow. A sharps container for safe disposal is worth having ready before your first injection.

What changes when your dose is increased, does the frequency change too?

No. The frequency stays fixed at once weekly throughout the entire treatment course, from the starter dose right through to maintenance. What changes is the amount of semaglutide in each injection. Your prescriber reviews your progress and tolerance before moving you to the next dose level, evidence of how you have responded at the current dose is part of that review.

The MHRA approved a higher 7.2 mg maintenance dose for Wegovy in early 2026, including a dedicated single-dose pen confirmed on 14 April 2026, but even at this higher strength the injection schedule remains once weekly. How the Wegovy injection schedule works across dose levels is covered in more depth on a related page.

It is also worth knowing that Wegovy is licensed for weight management, while Ozempic (also semaglutide) is licensed for type 2 diabetes. They are different products. The distinction between Ozempic and weight-loss injections is something many people want clarified before they start. If you are thinking about semaglutide specifically for weight management, our Wegovy overview is a good starting point, and details on how to access Wegovy through a regulated UK pharmacy are on a separate page.

What side effects are related to the injection schedule?

Most of the side effects people experience with semaglutide are gastrointestinal (nausea, loose stools, indigestion, constipation) and they tend to cluster in the days after an injection or a dose increase. The once-weekly schedule is partly designed to give your body the other six days to settle. For most people, these effects are mild to moderate and ease off as the weeks go on.

There are symptoms that need prompt medical attention regardless of where you are in the schedule: severe stomach pain that spreads towards the back is the main one, given the link between GLP-1 medicines and acute pancreatitis (the MHRA highlighted this in a Drug Safety Update in January 2026). Signs of a serious allergic reaction, gallbladder symptoms or significant dehydration from repeated vomiting also warrant urgent advice. None of these are reasons to inject more often or less often on your own initiative, they are reasons to contact a clinician. At nume, prescribers are available seven days a week for aftercare, and you can reach the team via the contact page. For a broader look at the treatment landscape before deciding anything, our weight-loss overview sets out the options clearly.