It depends on how long the break was. After a short gap most people resume where they left off. After a longer one, tolerance falls and restarting at your previous dose can bring back the symptoms you had when you first reached it. Each product specifies the gap length at which re-titration is advised, and your prescriber decides.
Do not restart on your own judgement after an extended break. The instinct is to pick up at the dose you were on, because you tolerated it before. Tolerance is not permanent, and a system that has been without the medication for weeks responds differently. Ask before you inject, not after.
For how this fits into the wider titration picture, see GLP-1 Dosing and Titration: The Complete Guide.
Why tolerance fades
The adaptation you built during titration was to continuous exposure. Remove the medication for long enough and the adaptation recedes, so the dose that felt unremarkable can land like a first dose again.
This is why re-titration exists as a concept rather than being an excess of caution. The same logic that made you start low the first time applies again after a long enough absence.
Short breaks
A missed week, or a short interruption, usually does not require restarting the schedule. You resume and carry on.
Even then, expect the possibility of a rougher week when you pick up, particularly if you were recently at a new dose.
Longer breaks
After several weeks off, re-initiating at a lower dose and working back up is commonly advised. Your product states the threshold, and your prescriber applies it to your situation.
Restarting lower is not lost progress. Working back up through doses you have already tolerated is usually quicker and easier than the first climb.
Tell them why you stopped
This matters more than people expect, because different reasons lead to different plans.
Supply or coverage gap. An interruption you did not choose. Worth stating plainly, since it sometimes affects prior authorization decisions and continuation criteria.
Side effects. Restarting the same way is likely to reproduce the same problem. A slower schedule, a lower target dose, or a different product are all worth discussing before you begin again.
Cost. If affordability drove the break, restarting without addressing it usually means another break. Manufacturer programmes, direct-purchase channels and appeal routes are worth exploring first.
Pregnancy or planning one. These medications are not used in pregnancy, and restarting needs to be planned around that with your prescriber.
You felt you were done. Weight regain after stopping is common and not a personal failure. Say so honestly, since it shapes what happens next.
What to expect on restarting
Appetite suppression generally returns as the dose builds, though not always at the same pace or intensity as the first time.
Side effects often return during the climb and then settle, in the same sawtooth pattern as before.
Weight may take time to respond, particularly if you regained during the break. Judging the restart by the first weeks repeats the mistake most people make at the beginning.
Before you restart
Check your supply is in date and has been stored correctly. A pen that sat in a fridge for months may be fine; one that was left out or moved during the break may not be. If in doubt, ask your pharmacist rather than injecting and hoping.
Tell your prescriber why you stopped, since a supply interruption and a cost-driven break lead to different plans. If cost was the reason, stopping because of cost covers what to sort before restarting.
Frequently asked questions
How long a gap needs re-titration?
Each product states this. Check the prescribing information or ask your prescriber or pharmacist.
Can I restart at my old dose?
Only if your prescriber says so. After a longer break it is often not advised.
Will it work as well the second time?
Most people respond again. Response can differ, which is worth discussing rather than assuming either way.
Do I need a new prior authorization?
Possibly, particularly after a long gap or a plan change. Check before you need the prescription filled.
Is my old pen still usable?
Depends on expiry and storage. Ask your pharmacist if the break was long or the storage uncertain.
Will side effects be as bad again?
Often milder on the way back up, though this varies. Tell your prescriber if the first climb was difficult.