Ozempic (semaglutide) is dosed once weekly by subcutaneous injection. The FDA label gives a clean rule for what to do if you forget a dose, anchored to a single number — 5 days from the originally scheduled injection day. Use this page when you realize you skipped a shot; for the full dose ladder and starting-dose schedule, follow the link to the drug overview at the bottom.
Quick decision flowchart
| Time since the missed dose | Action | Reason |
|---|---|---|
| 5 days or less (≤ 120 hours) | Take the missed dose as soon as possible. Resume your usual weekly schedule on the original day. | Semaglutide's half-life is roughly a week, so a dose given within 5 days keeps steady-state levels intact. |
| More than 5 days (> 120 hours) | Skip the missed dose entirely. Take the next dose on the regularly scheduled day. | Injecting close to your next scheduled dose stacks two doses inside one half-life and raises GI side-effect risk. |
Verbatim FDA label rule: “If a dose is missed, administer OZEMPIC as soon as possible within 5 days after the missed dose. If more than 5 days have passed, skip the missed dose and administer the next dose on the regularly scheduled day. In each case, patients can then resume their regular once-weekly dosing schedule.” (DailyMed SPL, SetID adec4fd2-6858-4c99-91d4-531f5f2a2d79, revision October 14, 2025.) A handful of older patient handouts cite a 4-day window — use the 5-day rule above; it matches the current FDA-approved prescribing information.
Quick facts
- Never inject two doses within 48 hours of each other. Even when catching up on a missed dose, leave at least 2 days between injections. Stacked doses raise nausea, vomiting, and dehydration risk sharply.
- Switching your weekly day requires ≥ 48 hours between doses. If your last shot was Sunday and you want to move to Wednesday, that works (3 days). Wanting to move from Sunday to Monday does not — wait a full week.
- Two or more missed weekly doses in a row? Contact your prescriber before resuming. Depending on how long the gap is and what dose you were on, the safer move may be to restart at a lower step rather than continue at your previous dose.
- Same day each week, any time of day. With or without food. Pick a consistent day so 5-day mental math is easy.
- Injection sites: abdomen, thigh, or upper arm. Rotate sites week to week.
- The 5-day rule is the same at every dose strength — 0.25 mg, 0.5 mg, 1 mg, and 2 mg. It does not change as you titrate up.
Restart protocol after a longer gap
The FDA label does not specify a fixed restart algorithm for gaps beyond 2 weeks, so this falls to clinician judgment. The conservative pattern most prescribers use:
- Gap of 2–4 weeks: many clinicians resume at the same dose, often with extra anti-nausea preparation (smaller meals, hydration, on-hand ondansetron if previously prescribed).
- Gap of 4–8 weeks: step down one level (for example, from 1 mg back to 0.5 mg) for at least 4 weeks before re-escalating, because tolerance to the GI effects fades quickly.
- Gap longer than 8 weeks: most prescribers restart the full titration from 0.25 mg, the FDA-labeled starting dose, and walk back up on the standard 4-week-per-step ladder.
- Confirm the plan with your prescriber, especially if you are on Ozempic for type 2 diabetes — restarts can shift your A1c trajectory and may require concurrent diabetes-drug adjustments.
Side-effect red flags after a restart
- GI flare-up from rapid re-escalation: nausea, vomiting, or diarrhea that prevents fluid intake for more than 24 hours. Acute kidney injury from volume depletion has been reported on the Ozempic label.
- Hypoglycemia (shakiness, sweating, confusion) if you also take insulin or a sulfonylurea. The FDA label explicitly notes that combination raises severe-hypoglycemia risk; your prescriber may need to reduce the insulin or sulfonylurea dose during the restart window.
- Severe, persistent abdominal pain — especially radiating to the back. Possible acute pancreatitis; stop the next dose and seek medical care.
- Right-upper-quadrant pain, fever, jaundice, or clay-colored stools. Possible gallbladder disease, listed as a labeled adverse reaction.
- Hives, facial or throat swelling, or trouble breathing. Anaphylaxis and angioedema have been reported — do not take another dose, and seek emergency care.
- Vision changes if you have type 2 diabetes. Rapid glycemic improvement after restart can transiently worsen diabetic retinopathy.
What this cheat sheet does not cover
- Switching from Ozempic to Wegovy — the two drugs use different dose ranges and step ladders; do not transfer your Ozempic dose directly. See the Wegovy dose ladder reference below for the destination schedule.
- Travel and timezone changes — small day-of-week shifts (a few hours from a transatlantic flight) do not change the 5-day rule. Picking a new weekly day permanently does — require ≥ 48 hours from the last injection.
- Refrigeration interruptions in transit. Unused Ozempic pens require refrigeration at 36–46°F. In-use pens are stable at room temperature (up to 86°F) for up to 56 days per the FDA label. Pens exposed to higher temperatures or freezing should not be used.
- Pediatric, pregnancy, and renal-impairment dosing — these have separate label sections not summarized here. Confirm with your prescriber.
Related on Weight Loss Rankings
- Ozempic drug overview — mechanism, full dose ladder from 0.25 mg to 2 mg, trial data, pricing, and the 2026 label updates.
- Wegovy Dose Ladder Cheat Sheet — the destination schedule if your prescriber is moving you from Ozempic to Wegovy.
- GLP-1 Missed-Dose Guide — interactive tool that applies the 5-day and 48-hour rules to every GLP-1 with worked examples.
- Ozempic vs Mounjaro — head-to-head comparison if you are weighing a switch.