Why this isn't a one-size-fits-all answer
Missed-dose guidance for GLP-1 medications depends on two things: how long it's been since the missed dose, and which specific medication you're on (weekly injections and daily injections follow different logic). Getting this wrong matters in both directions — taking a dose too close to your next one risks compounding side effects, while skipping a dose incorrectly can disrupt your titration progress or blood sugar control. This guide covers the general framework; always confirm the specific rule for your medication with the patient information that comes with your prescription or with your pharmacist, since exact windows vary by drug and are stated precisely in official labeling.
The general framework for weekly injections
For once-weekly medications (semaglutide, tirzepatide), the general pattern used across the class is: if you're still within several days of your missed dose, take it as soon as you remember and then resume your regular weekly schedule from that new date, or return to your original schedule — this specific detail varies by drug. If too much time has passed before you remember (generally getting close to your next scheduled dose), the typical guidance is to skip the missed dose entirely and take your next dose on the regularly scheduled day, not doubling up. The exact day-count threshold differs between medications — this is precisely the kind of detail to check against your specific medication's patient information rather than assume.
The general framework for daily injections
For once-daily medications (liraglutide), missed-dose guidance is generally more time-sensitive given the shorter half-life — typically involving a same-day catch-up window, with guidance to skip and resume the normal schedule if too much time has passed, again without doubling up.
Why you should never double a dose to "catch up"
Regardless of specific drug, doubling up to make up for a missed dose is not standard guidance for any GLP-1 medication and increases the risk of significant side effects, given how directly dose relates to GI symptom severity (see our GI side effects overview).
If you're unsure
Call your pharmacist or prescriber's office directly rather than guessing — this is a fast, low-friction question for either to answer, and getting it right matters more than the minor inconvenience of asking.
The bottom line
Missed-dose handling depends on timing and your specific drug, follows a general "catch up if still close, otherwise skip and resume schedule" logic, and should never involve doubling a dose — when in doubt, a quick call to your pharmacist is the reliable answer.