What to do if you miss a dose

First, the reassurance, because you probably need it

Missing a dose is not a crisis, not a relapse, and not evidence of anything about your character. It happens to almost everybody eventually. These are weekly medicines with long half-lives, which means the drug does not vanish from you on the day you were due — it declines slowly over many days, which is precisely why the leaflets are able to describe a window rather than an emergency.

Tomás, who holds our slow-titrators circle, says the most common harm from a missed dose is not pharmacological at all. It is the panic response: doubling up, injecting late without checking, or quietly deciding the whole thing has been ruined and stopping. Every one of those is worse than the missed dose was.

So the shape of this page is deliberately simple. Find out what your product says. Do not improvise arithmetic. Ask if you are unsure. And then get on with your week.

What the leaflets are structured to say

Every one of these products has a "if you forget to use" section, and they all follow the same architecture: a window during which you take the missed dose when you remember and carry on with your usual day, and a point beyond which you skip it entirely and take the next one as normal.

We are not going to print the number, and that is a deliberate editorial choice rather than caginess. The window differs by product, and the approved wording differs by country for the same molecule. A member in Toronto and a member in Manchester holding the same drug can have leaflets that read differently. Copying a number out of a forum post is exactly how people get it wrong.

Your leaflet is in the box, and if the box is gone it is available from the pharmacy that dispensed it, in about a minute, over the counter or on the phone. A pharmacist will read you the relevant paragraph without judgement and without needing an appointment. This is genuinely one of the easiest questions in the whole of healthcare to get answered properly.

Daily products — liraglutide, oral semaglutide — have their own quite different wording, and if you are on one of those, the weekly logic on this page does not transfer.

Never double up

The one thing we will say flatly. Do not take two doses close together to compensate, and do not take a larger dose to catch up. The gastrointestinal effects of these drugs relate strongly to how fast the amount in your system rises, which is the whole reason titration exists — see titration, why slow is kind to you. Doubling up produces exactly the spike the stepped schedule was designed to avoid, and the result is often a genuinely awful two or three days.

The same applies to the tempting logic of "I will take it a day early next week to get back on schedule". Any change to your injection day is a conversation with your prescriber, not a decision you make while annoyed with yourself on a Tuesday night.

If you have already doubled up before reading this, ring the prescribing service or a pharmacist today and describe what you took and when. Significant overdoses of these medicines mostly produce severe nausea and vomiting rather than anything catastrophic, but dehydration is real and, if you also take insulin or a sulfonylurea, low blood glucose becomes a genuine concern. That call is the right move, not an overreaction.

When the gap is longer than a week or two

This is a different situation, and it comes up constantly during shortages, after a delivery failure, or when money runs out for a month. See shortages and substitutions and paying out of pocket without panic for those causes.

Two things tend to happen after a longer break. The appetite effects fade — in STEP 4 (Rubino, JAMA, 2021), people who switched to placebo after the escalation phase saw the trajectory reverse over the following months, and the follow-up work after STEP 1 found much of the effect returned towards baseline within about a year off treatment. That is not a moral event; it is what the drug doing something looks like in reverse.

The other is tolerance. Restarting at the dose you were on can bring back the early nausea, sometimes hard, because your gut has re-adjusted. Prescribers commonly restart people lower and step back up, and that is a clinical judgement based on how long the gap was. Do not decide it yourself from a box you still have in the fridge.

Members in our restarting after a break circle describe the emotional side as harder than the physical one. It is worth saying clearly: a gap is a gap. People here have had months off and come back, more than once, and are doing fine.

Why doses actually get missed

Worth naming, because "I forgot" covers a lot of very different problems and only one of them is solved by an alarm.

• Supply. Pharmacy has none, delivery failed, prescription not reissued in time. The commonest cause in our circles by a distance, and not your doing.
• Money. A month where it simply was not affordable. Bea missed three weeks this way and said nothing to anybody for a fortnight.
• Illness or hospital. Sensible in some circumstances and worth asking about rather than assuming, particularly around procedures with fasting, where anaesthetists now often want to know you are on one of these drugs.
• Avoidance. The dose that gets skipped because the last one made you feel dreadful. This one is a titration conversation, not a memory problem.
• Genuine forgetting. Real, common, and the easiest to fix.

If your reason is one of the first four, the fix is not a phone reminder. It is a conversation with a prescriber, a pharmacist or Petra's paying out of pocket circle.

Systems that stop it happening again

What has worked for members, none of it complicated.

Pick a fixed injection day and treat it as an appointment. Most people find a day that is neither the busiest nor the one where feeling rough would ruin something important. Shift workers have particular constraints and Kiki's shift-workers circle is the place to compare notes.

Set two reminders, not one: one on the day and one the evening before, because the evening one is what prompts you to take the pen out to warm up. Several members use the act of taking it out of the fridge as the actual cue.

Keep the two-line note. Date and site, every time, in the same place — see a symptom diary that you will actually keep. It removes the "did I actually do it on Thursday?" question entirely, which is its own small mercy.

Reorder when you open the last carton rather than when you use the last dose. Every member who has been caught by a shortage now does this, and it is the single highest-value habit on this page.

And tell somebody. A buddy who texts on Thursdays is more effective than any app we have ever seen recommended here — see buddies.