Wegovy missed dose side effects — what actually happens and what to do next

Step 1, what happens in your body when a weekly injection is delayed

Semaglutide works by keeping blood levels of the medicine relatively steady across the week. That steady level is what slows gastric emptying, signals fullness and quietens appetite. When a dose is missed, those levels start to fall, usually noticeably from around 48 hours in, depending on which strength you're on. At the 2.4mg stage (and increasingly at the newer 7.2mg maintenance dose), the drop is more pronounced than at the early titration steps.

The practical result: hunger returns faster than many people expect, and the stomach, having adjusted to slower emptying, can react with some turbulence as things speed back up. Bloating, loose stools and a general unsettled feeling are all recognised parts of this. This is not a sign something has gone wrong with the medicine itself. It reflects how semaglutide's mechanism naturally winds down between doses.

If you want a fuller picture of how effects vary across the dosing ladder, the Wegovy doses guide on this site covers each strength in plain terms.

Step 2, what to actually do if you've missed a dose

The rule is straightforward. If you realise a dose was missed and your next scheduled injection is still five or more days away, take the missed dose as soon as you remember. If fewer than five days remain before the next injection is due, leave the missed one and carry on with the regular day. Never take two doses to compensate, the side effect burden roughly doubles, and the therapeutic benefit does not.

After any gap, some people notice a brief return of early-treatment nausea when they resume, and if you are currently on the 1mg strength you can read more about what to expect on the Wegovy 1mg side effects page. Eating smaller, lower-fat meals and staying well hydrated helps the body re-settle.

Decisions about whether to adjust the dose schedule after a longer gap (say, a fortnight's interruption due to illness or supply) belong with your prescriber. The side effects of missing a Wegovy dose page goes into greater depth on the specific symptom patterns across different gap lengths.

Step 3, side effects that need prompt medical attention

Most missed-dose symptoms are uncomfortable rather than dangerous. Some, however, need same-day or emergency assessment. Seek urgent medical help if you experience:

• Severe stomach pain, especially pain that radiates to your back, this may indicate pancreatitis, an infrequent but serious side effect flagged in the MHRA Drug Safety Updates for GLP-1 medicines in January 2026.
• Signs of significant dehydration from persistent vomiting or diarrhoea: dark urine, dizziness on standing, or confusion.
• Symptoms of an allergic reaction: swelling of the face, lips or throat, or difficulty breathing.
• Gallbladder pain, severe pain in the upper right abdomen, particularly after eating.

For anything less acute but that still concerns you, our support team is reachable seven days a week. If you suspect the medicine itself may be the cause of a side effect, patients can report it directly at the MHRA Yellow Card scheme.

Putting the overall side effect picture in context

A missed dose sits within the broader landscape of how Wegovy affects people week to week. GI effects (nausea, diarrhoea, constipation, reflux, burping) tend to be most noticeable when starting treatment or stepping up to a new strength, not only when a dose is missed, and those starting out at the lowest strength can find a detailed breakdown on the side effects of Wegovy 0.5 page. Understanding the full profile helps you distinguish a gap-related blip from a pattern worth flagging. The 2.4mg side effects page and the 1.7mg side effects page break these down by the specific maintenance doses most people spend the longest time on.

Wegovy is a prescription medicine requiring clinical assessment at the outset and ongoing review. At nume, a GPhC-registered Independent Prescriber reads every consultation, a real clinician, same day. If you're considering starting treatment or are already on it and have questions about how your experience compares to what's expected, starting a free consultation is the practical next step. There's no obligation, and side-effect questions are exactly the kind of thing our prescribers are there for.