Can You Restart Mounjaro on 5mg? (October 2026)

01 · The core answer

Can you restart Mounjaro at 5mg?

You may be able to, but the decision belongs to a prescriber who knows your history. The licensed ladder is clear about where treatment begins: everyone starts Mounjaro on 2.5mg once a week.¹ It also says this starting dose is about letting your body adjust, not about weight loss itself.¹ That adjustment is the reason a restart can differ from simply carrying on.

Our other guides cover neighbouring questions in more detail: restarting after a break.

02 · Your decision

What decides your restart dose

Three questions shape the answer. Your prescriber will usually ask about all of them.

If you are ready to talk it through, you can start with a free consultation for the Mounjaro pen. A 5mg pen costs £218.99 and a 2.5mg pen £169.99, with all doses in stock. Prices checked 10 October 2026.

03 · How long it stays in your system

How long Mounjaro stays in your system

Clearance is slow, which is why a short gap rarely means starting from scratch. Tirzepatide has a half-life of about five days, so after a final dose it takes roughly 4–5 weeks to clear the system — there is no way to speed this up, and nothing needs doing while it clears.¹

Your prescriber looks at your own history to decide the restart dose.

04 · Missed dose or restart?

Missed dose or restart?

A missed dose and a restart are different situations. For a missed dose, take it as soon as you can within 4 days (96 hours) of the scheduled time, then carry on with your usual day. If more than 4 days have passed, skip the missed dose entirely and take the next one on your normal day — never take two doses within 3 days of each other.¹

If you have missed several weekly doses in a row, you are beyond that rule. Do not simply resume where you left off. Contact your prescriber, tell them how many doses you missed, and ask which strength to use. If you are changing your injection day, at least 3 days must pass since your last dose.¹

05 · Why 5mg is not a safe default

Why 5mg is not a default

Many people settle at 5mg, and it is an effective dose for some. After at least 4 weeks the dose increases to 5mg, and can then step up by 2.5mg at a minimum of 4-week intervals (7.5mg, 10mg, 12.5mg) up to a maximum of 15mg weekly, depending on how you respond and tolerate it.¹ Higher is not automatically better, and your prescriber will guide the right pace.

For context, in the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone.² These are trial averages, and individual results vary.

If you are weighing 5mg against a lower or higher restart, our guides on starting at 5mg, what to expect on a 5mg start and starting at 7.5mg explain the trade-offs. If you are thinking of stopping instead, see stopping at 5mg.

06 · Restarting with EverydayMeds

Restarting with EverydayMeds

We make restarting a clinical conversation, not a checkout step. You complete a free online consultation, and a GPhC-registered prescriber reviews it. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full. Repeat orders re-check suitability, with no auto-shipping.

Your supply comes through official LillyDirect channels, with free next-day tracked delivery and same-day dispatch when you order by 3pm. See our weight loss clinic for the full service, or read how people approach a restart after a long break.

07 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹