💉 Ozempic / Wegovy (Semaglutide)
💉 Mounjaro / Zepbound (Tirzepatide)
Contents
Ozempic & Wegovy — Semaglutide
These are the official missed-dose instructions from Novo Nordisk's prescribing information. The rules are identical for both Ozempic and Wegovy.
If 5 days or fewer have passed since your scheduled dose:
- Inject the missed dose as soon as you remember. You can inject on any day of the week — it doesn't need to be your normal day.
- Reset your weekly schedule from this new injection date. Your next dose is due exactly 7 days from now.
- Update your reminder or calendar to reflect the new injection day going forward.
If more than 5 days have passed since your scheduled dose:
- Skip the missed dose entirely. Do not inject it now — it's too late to take it safely within the weekly interval.
- Take your next dose on your originally scheduled day as if nothing happened. Your schedule does not change.
- Do not take two doses within 7 days under any circumstances.
💡 The 5-day window exists because semaglutide has a 7-day half-life. Even at day 5, roughly 60% of the previous dose is still active in your system. Injecting within this window won't cause dangerous accumulation when your next weekly dose arrives.
🚨 Never take a double dose. Two doses within one week significantly increases risk of severe nausea, vomiting, and in diabetic patients, hypoglycemia. The harm far outweighs any potential benefit of catching up.
Mounjaro & Zepbound — Tirzepatide
Official missed-dose instructions from Eli Lilly's prescribing information for both Mounjaro and Zepbound.
If 4 days or fewer have passed since your scheduled dose:
- Inject the missed dose as soon as you remember.
- Reset your weekly schedule from this new injection date — next dose in 7 days.
- Update your injection day reminder to the new day of the week.
If more than 4 days have passed:
- Skip the missed dose. Do not inject a late dose.
- Return to your original injection day for your next scheduled dose.
- Never take two doses in the same 7-day period.
💡 The tirzepatide window is 4 days (vs 5 days for semaglutide) because tirzepatide's half-life is slightly shorter at approximately 5 days. By day 4, a larger portion of the previous dose has been metabolized, making timing more critical.
Why One Missed Dose Is Usually Fine
Both semaglutide and tirzepatide have exceptionally long half-lives. Here's what your drug level looks like after a missed injection:
| Days Since Last Dose | Semaglutide Level | Tirzepatide Level | Clinical Effect |
|---|---|---|---|
| Day 7 (scheduled next dose) | ~50% | ~36% | Still active |
| Day 10 | ~37% | ~25% | Reduced but present |
| Day 14 | ~25% | ~13% | Noticeably diminished |
| Day 21 | ~12% | ~6% | Minimal |
| Day 35 | ~3% | <1% | Effectively cleared |
Even at the point when your next dose is due (day 7), roughly half of your previous dose is still circulating and active. This pharmacokinetic buffer is why a one-week gap in dosing does not cause a sudden collapse in therapeutic effect.
What to Expect After a Missed Dose
Increased Hunger
As drug levels decline during a missed week, you will likely notice gradually increasing appetite — some return of the "food noise" that GLP-1 medications suppress. This is expected and temporary.
Possible Return of Cravings
GLP-1 medications reduce hedonic eating signals in the brain. During a drug-level gap, cravings for high-calorie foods may return more strongly. The craving is pharmacological, not a failure of willpower.
Mild Nausea When Resuming
After a gap of 2 or more weeks, some people experience mild nausea when they resume injections. This is normal and typically resolves within a few days. If the gap was longer than 4 weeks, your provider may recommend restarting at a lower dose.
Weight
One missed dose will not meaningfully affect your overall weight loss. You may see a slight temporary uptick on the scale, but this resolves quickly once you resume your regular schedule.
Special Considerations for Diabetes Patients
⚠️ If you use Ozempic or Mounjaro primarily for type 2 diabetes management, a missed dose may cause blood sugar to rise. Monitor your glucose more frequently during a missed week — especially if you are not on other diabetes medications.
If you are on insulin or sulfonylureas in addition to your GLP-1 medication, be alert for hypoglycemia when you resume — the combination effect can be stronger than usual after a drug-level gap. Contact your diabetes care team if blood glucose is consistently above your target range for more than 2–3 days.
Accidentally Took a Double Dose
🚨 If you accidentally injected two doses within the same week, contact your healthcare provider or call Poison Control (1-800-222-1222 in the US) immediately. You may experience severe nausea, vomiting, diarrhea, and — in diabetic patients — hypoglycemia. Do not induce vomiting. Monitor symptoms closely and seek emergency care if symptoms are severe.
After a double dose, resume your normal weekly schedule from the date of the second injection — your next dose is 7 days after the accidental double dose.
How to Never Miss a Dose
- Set a recurring weekly phone alarm — label it "Injection Day" with a non-snooze alert
- Pair with a weekly ritual — injecting right after a specific recurring event builds an automatic habit
- Keep medication visible — store your pen at the front of the refrigerator so you see it every day
- Order refills early — set a pharmacy auto-refill so you never run out and are forced into an unplanned supply gap
- Mark a physical calendar — a visible check-off on the fridge or bathroom mirror is a simple but highly effective reminder
- Use our Dose Schedule Builder — generate your full injection calendar with every date mapped out
All GLP-1 Medications — Missed Dose Reference
| Medication | Frequency | Take Late If Within | If Beyond Window |
|---|---|---|---|
| Ozempic (semaglutide) | Weekly | 5 days | Skip; next regular day |
| Wegovy (semaglutide 2.4mg) | Weekly | 5 days | Skip; next regular day |
| Mounjaro (tirzepatide) | Weekly | 4 days | Skip; next regular day |
| Zepbound (tirzepatide) | Weekly | 4 days | Skip; next regular day |
| Trulicity (dulaglutide) | Weekly | 4 days | Skip; next regular day |
| Bydureon (exenatide ER) | Weekly | 3 days | Skip; next regular day |
| Saxenda (liraglutide) | Daily | Same day only | Skip; resume next day |
| Victoza (liraglutide) | Daily | Same day only | Skip; resume next day |
Source: Official prescribing information for each medication. Always refer to your specific medication guide or consult your pharmacist if uncertain.