Wegovy is designed to be injected once every 7 days, but you have a built-in grace period if you’re late. The key threshold is 48 hours: if your next scheduled dose is more than 2 days away, take the missed shot as soon as you remember. If it’s less than 2 days until your next dose, skip the missed one entirely and pick back up on your regular day.
That’s the simple version. But the real answer depends on how long the gap is, whether you’re on a higher dose, and how your body handles the medication wearing off.
The 48-Hour Rule for a Single Missed Dose
Wegovy’s manufacturer spells this out clearly. Say your injection day is Wednesday and you forget. If you remember on Thursday, take it right away, since your next scheduled dose is still more than 48 hours out. If you don’t remember until Tuesday, skip that dose and just inject on Wednesday as usual. You don’t double up.
This flexibility exists because semaglutide (the active ingredient in Wegovy) has a long half-life of roughly one week. After your injection, the drug takes about 4 days to reach peak levels in your bloodstream, and it clears slowly. Even a day or two late, you still have meaningful drug levels circulating. That slow clearance is also why Wegovy works as a weekly shot rather than a daily one.
Why Two or More Missed Weeks Changes Things
A single late dose is straightforward. Missing two or more consecutive weeks is a different situation. After a gap of about two weeks, your provider needs to weigh in before you restart. The concern isn’t just that drug levels have dropped. It’s that your body may no longer be adapted to the dose you were on, which raises the risk of nausea, vomiting, and other GI side effects that are common when first starting the medication.
The longer the gap, the more likely you’ll need to step back to a lower dose. If you’ve spent five months building up to your current dose and you miss a few weeks, your provider might restart you at whatever dose you were taking a month earlier in the schedule. Wait too long to address the gap, and you could end up going all the way back to the 0.25 mg starting dose and working through the full titration again. That process takes months, so it’s worth acting quickly if you realize you’ve fallen behind.
How Long the Drug Stays in Your System
Semaglutide’s elimination half-life is approximately 6.5 to 7 days. In practical terms, that means about half the drug is still in your body a week after your last injection. It takes 4 to 5 weeks of consistent dosing to reach steady-state levels, where the amount going in each week roughly matches the amount being cleared.
After a single missed dose, you still have a substantial reservoir of semaglutide from prior weeks. You’ll likely notice some return of appetite, but the drop isn’t dramatic. After two missed doses (roughly 14 days without an injection), levels have fallen significantly. After three or four missed weeks, most of the drug has cleared, and the appetite-suppressing and blood sugar effects will have largely faded. This is the pharmacological reason behind the two-week threshold for contacting your provider.
Changing Your Injection Day
If your schedule needs to shift permanently (say, moving from Wednesday to Saturday), you can change your injection day as long as at least 2 days have passed since your last dose. So if you injected on Wednesday, the earliest you could take your next shot on the new schedule would be Friday. From there, you’d continue on your new weekly day. There’s no need to restart or adjust your dose for a simple day change.
Traveling and Pen Storage
Missed doses sometimes happen because of travel logistics, so it helps to know how the pens hold up outside a refrigerator. Wegovy pens can stay at room temperature for up to 28 days, as long as the temperature stays between 46°F and 86°F and the pen is kept away from direct light. After 28 days unrefrigerated, the pen should be discarded even if it still contains medication. If you’re traveling for less than a month, you don’t need a cooler, though keeping the pen in a climate-controlled bag is smart in hot weather.
What Happens to Your Body During a Gap
Semaglutide works by mimicking a gut hormone that slows stomach emptying, reduces appetite, and influences how your brain registers fullness. As drug levels drop, these effects gradually reverse. Most people notice increased hunger within the first week of a missed dose, though the change is subtle at first because of the slow clearance. By week two or three without a dose, appetite typically returns to something close to pre-treatment levels.
Weight regain can follow, though it doesn’t happen overnight. Studies on semaglutide discontinuation show that most weight regain occurs over months, not days. A single missed week won’t undo your progress. Even a two-week gap, while worth addressing promptly, isn’t a crisis for your overall trajectory. The priority is getting back on track with your provider’s guidance rather than worrying about short-term fluctuations on the scale.