I Missed My Weekly GLP-1 Dose. What Now?

How late is too late?

Between two and five days, depending entirely on which drug you are on. Read the row for yours rather than the one you saw on a forum.

From the respective prescribing information.¹²³

Two things in that table catch people out. Ozempic and Wegovy are the same molecule with different instructions, because they are different products at different doses. And the minimum gap matters as much as the window: taking a late dose and then your scheduled one two days later puts two doses close together, which is the thing the gap exists to prevent.

Why the windows differ

Half-lives, mostly, and the gap between them is smaller than the rules suggest.

Semaglutide's elimination half-life is about a week and tirzepatide's about five days.¹² Both are long enough that one missed injection does not empty you out. What changes is how much drug is still present when the next dose lands, and the windows are set so that a late dose plus a scheduled dose never stack into something closer to a double.

That is also why the answer is never "take two". Two doses inside a few days of each other, on drugs that take weeks to clear, is a dose increase you did not plan and did not escalate into.

What actually happens if you miss one

Less than people fear, and the fear is usually about appetite returning.

With week-long half-lives, drug levels decline gradually rather than falling off a cliff. A dose that is two days late is pharmacologically close to on time. A week skipped entirely means levels drop toward the bottom of their usual range, and the common report is appetite returning before anything else.

What does not happen is a reset. You do not go back to the beginning, you do not have to re-escalate after one missed dose, and the weight you have lost does not depend on an unbroken streak.

Repeated misses are a different question. A pattern of missing doses means your average exposure is lower than your prescribed dose, which is worth saying out loud to a prescriber rather than quietly tolerating.

What if I forgot for several weeks?

Here the published guidance mostly runs out.

Zepbound's label says nothing about restarting after a long break. Neither do the others in any detail. That silence is real and it is why advice online varies so much: people are filling a gap the manufacturers left.

What is known: the escalation schedule exists because gut side effects cluster at dose increases, and tolerance to those effects fades when exposure stops. Someone returning after a month away is closer to a person starting than to a person continuing, and a prescriber may well restart lower.

That is a conversation rather than a rule, and anyone giving you a specific restart protocol for these drugs is going beyond what any label says.

When the reason you missed it is supply

No prescribing information contemplates this one, and it is the common case for anyone buying outside a pharmacy.

A prescription runs out and gets refilled. A grey-market supply chain fails differently: a vendor stops answering, a package sits with customs, a vial arrives and the powder is wrong, or the money went to a payment method with no reversal. None of those resolve on a weekly schedule.

This is measurable rather than anecdotal. We check every tracked seller's site on each capture. In the 29 September run, 163 hosts were checked and 22 of them did not return a working storefront: fourteen returned a 403, three did not respond at all, and the rest returned server errors or a missing page.⁴ Some of those recover within days. Some do not.

That is roughly one seller in seven unreachable on the day we looked, which is the background rate behind every "my vendor went quiet" post.

Three things follow, and the first is the useful one.

A gap you can see coming is not a missed dose. If you know the next vial is three weeks away, that is a conversation to have before you run out rather than a problem to solve on the day. Reordering earlier costs nothing; our cost guide covers working out your reorder date from what is actually in the vial.

A long involuntary gap is a restart question, not a missed-dose question. The table at the top of this page answers "my dose is four days late". It does not answer "I have not injected for six weeks because my vendor disappeared". That is the restart conversation, and the labels are silent on it.

The pressure to take whatever arrives is the risk. Someone three weeks into a gap, with a new vial from a seller they have not used before, is making two decisions at once: whether to restart and whether to trust the vial. Our guides on vendors vanishing and on reading a COA cover the second one. Doing both at once, at your old dose, is how people end up ill and unsure which decision caused it.

Missing a dose during escalation

A different question from missing one at a steady dose, and nobody has written down an answer.

The escalation schedules are written as a minimum time at each step, not a count of injections: at least four weeks at a dose before increasing, in both approved programmes. A single missed week does not undo the time you have spent at that dose, and it does not mean starting the step again.

What it does mean is that your exposure that month was lower than planned. If you were about to step up and then missed a dose, stepping up on schedule means a larger jump than intended from where you actually are.

That is a prescriber judgement rather than a rule, and the reason to raise it is that gut side effects cluster at increases, which is exactly what you are modifying.

Why the advice you find contradicts itself

Search this and you will get four different answers, all stated confidently.

Five days. Four days. Forty-eight hours. Take it whenever you remember.

All of them are real rules from real labels, attached to the wrong drugs. The five-day rule is Ozempic's. The four-day rule is tirzepatide's. The 48-hour framing is Wegovy's. And "whenever you remember" belongs to the daily oral drugs, where the stakes are much lower.

The error that matters most is applying Ozempic's five days to Wegovy, because they share a molecule and a manufacturer and people assume the rules travel. They do not.

What if I missed a retatrutide dose?

No label, no rule, and that is the answer.

What exists is a half-life of about six days, which is in the same range as the approved drugs.³ People reason from that to a window resembling tirzepatide's, and that reasoning is not unreasonable. It is also not a rule, and nobody has studied missed doses of this compound in anyone.

Two things are worth being clear about. The 72 to 96 hour spacing principle in the approved labels exists to stop doses stacking, and that physics does not care whether your compound has a label. And the escalation logic is the same: the trial schedules escalated slowly for a reason, and a long gap followed by your previous dose is not the same as continuing.

Common questions

What if I miss a dose of Zepbound or Mounjaro?

Take it within 4 days (96 hours) of the scheduled day. Past 4 days, skip it and take your next dose on the regular day. Keep at least 72 hours between any two doses.

What if I miss a dose of Wegovy?

Wegovy's rule is framed around the next dose rather than the missed one: if your next scheduled injection is more than 2 days away, take the missed dose as soon as possible; if it is less than 2 days away, skip it.

Is the Wegovy rule the same as Ozempic?

No, and this is the most common mistake. Ozempic's label gives a 5-day window. Wegovy uses the 2-day framing above. Same molecule, different products, different instructions.

Can I take two doses to catch up?

No. Every label says to skip rather than double, and the minimum spacing rules exist to stop two doses landing close together. On drugs that take weeks to clear, doubling up is an unplanned dose increase.

Will I lose progress if I miss one week?

Unlikely. These drugs have week-long half-lives, so levels decline gradually. Appetite returning is the usual first sign. One missed dose does not reset your progress or require re-escalation.

Can I take my shot a day early?

Within the spacing rules, yes. Tirzepatide needs at least 72 hours between doses and Wegovy at least 48, so a dose a day or two early is allowed if that gap is kept. Earlier than the gap is effectively doubling up.

How often do peptide vendors actually go quiet?

More often than people expect. On our 29 September liveness run, 22 of 163 tracked seller sites did not return a working storefront, which is roughly one in seven on the day. Some recover within days. A 403 usually means a bot block rather than a closure, so this is a measure of reachability rather than of vendors disappearing.

I ran out because my order never arrived. Is that different?

In practice yes. A short gap follows the table above. A long involuntary gap is a restart question, which the labels do not address, and restarting at your old dose after weeks away is the part worth discussing with a prescriber rather than deciding alone.

Can I change my injection day?

Yes, within the spacing rules: at least 72 hours between doses for tirzepatide, at least 48 hours for Wegovy. Move the day and keep every future dose on the new schedule.

I forgot my shot two days in a row. What now?

A dose is either within its window or it is not; forgetting on consecutive days does not change the rule. Check the table for your drug, take it if you are inside the window, and skip it if you are past it. Never take two to catch up.

What if I have missed several weeks?

The labels say very little about restarting, which is why online advice varies so widely. Tolerance to gut side effects fades when exposure stops, so returning at your previous dose is not the same as continuing. That is a prescriber conversation.

What about retatrutide?

There is no label and no missed-dose rule. Its half-life is about six days, in the same range as the approved drugs, and people reason from that. Reasoning is not a rule, and nobody has studied it.

Sources

1. Wegovy and Ozempic (semaglutide) prescribing information. accessdata.fda.gov. The approved labels. Wegovy is administered once weekly on the same day each week; its missed-dose instruction turns on whether the next scheduled dose is more or less than 2 days away. Ozempic's label gives a 5-day window for a missed dose. Semaglutide's elimination half-life is approximately 1 week.
2. Zepbound and Mounjaro (tirzepatide) prescribing information, Recommendations Regarding Missed Dose. pi.lilly.com. The approved labels. A missed dose should be administered as soon as possible within 4 days (96 hours); if more than 4 days have passed, skip it and administer the next dose on the regularly scheduled day. The day of weekly administration may be changed as long as at least 3 days (72 hours) separate the two doses. Tirzepatide's elimination half-life is approximately 5 days.
3. Foundayo (orforglipron) prescribing information and retatrutide pharmacokinetics. accessdata.fda.gov. The Foundayo label instructs one tablet daily and not more than one per day. The Wegovy pill's missed-dose instruction is to skip and resume the following day. Retatrutide has no approved label; its half-life of approximately 6 days is reported in the phase 2 publication.
4. Peptide Decoding vendor liveness check, run of 29 September 2026. peptidedecoding.com/vendors. Our own data. Each tracked seller's site is requested on every capture and the response recorded. In that run, 163 hosts were checked: 141 returned a normal response, 14 returned 403, 3 did not resolve or respond, and the remainder returned 5xx errors or a 404. A 403 usually means a bot block rather than a closure, which is why the page describes these as unreachable on the day rather than as vendors that have disappeared.

Citing this page. Peptide Decoding. I Missed My Weekly GLP-1 Dose. What Now? Label rules as cited. https://peptidedecoding.com/guides/missed-glp1-dose