No. A Mounjaro KwikPen contains four fixed doses, and the liquid you can see afterwards is not a fifth dose. A small amount of medicine may remain after all four doses have been correctly administered. The term "golden dose" is commonly used online for this leftover medicine, but it is not an additional dose and should not be used.
That answer can be disappointing, especially for people using Mounjaro as part of a weight management plan. However, it is worth understanding why the liquid remains rather than simply being told not to use it. This page explains how the pen is designed, what the remaining medicine means, why the device cannot provide a Mounjaro fifth dose, and what to do if you are running short of your supply or need a dose change.
Eli Lilly's UK product information states that a small amount of solution may remain after the four doses have been given and that patients should not try to use the remaining medicine. Trying to use the remaining solution could result in an incomplete or unknown dose. The remaining liquid should therefore be treated as residual medicine, not as an additional dose.
Trying to extract and use the remaining medicine from a Mounjaro pen is not recommended because the amount left is not a measured or prescribed dose. Follow your prescribed dosing schedule and speak to your prescriber if you have concerns about your dose or supply. Your prescriber, pharmacist or GP can advise you about your treatment plan and any changes that may be needed.
Understanding the purpose of the remaining liquid and the design of the pen can help you avoid changing how the device is used and follow the prescribed instructions.
How Many Doses Are in a Mounjaro Pen?
Each KwikPen contains four fixed doses of 0.6 ml. A small amount of medicine may remain after all four doses have been correctly administered. The pen is designed to be primed before each injection.
That extra liquid is the source of many questions. It is visible and can look as though there is enough medicine for another injection. However, it is not a spare dose that the manufacturer has provided as a bonus.
| What the pen contains | What it is for |
|---|---|
| Four doses of 0.6ml | The four weekly injections |
| Additional solution | Priming before each of those four injections |
| Whatever remains at the end | Residual medicine that should not be used |
What the Leftover Liquid Actually Is
Priming is the process used to remove air from the cartridge and confirm that the pen is working correctly. The UK Instructions for Use specifies a prime position after two clicks, followed by releasing a small amount of medicine. A small amount appearing at the needle tip indicates that the pen has been primed.
Priming is required before every injection, not just the first one. The pen contains enough solution to allow for priming as part of its intended use. Some liquid may therefore remain after the fourth dose.
The important point is simple: the remaining liquid is not a bonus dose. It is not a measured amount intended for another injection.
Residue at the End Is Expected
Lilly's UK guidance states that medicine may remain in the KwikPen after the fourth dose and that an additional complete 0.6 ml dose cannot be dialled. It also instructs patients not to inject the remaining medicine because doing so could result in an incomplete dose.
The remaining amount is not presented as a measured dose, so you cannot use the amount you can see to work out how much tirzepatide is left.
Why the Device Cannot Give You a Fifth Dose
Searches such as Mounjaro how to get 5th dose, how to get 5th dose out of Mounjaro pen, how to get a 5th dose out of Mounjaro pen, how to get 5th dose from Mounjaro pen, how to get fifth dose out of Mounjaro pen and how to force Mounjaro pen 5th dose all lead to the same basic point: the device is designed for four fixed doses.
The KwikPen has a defined prime position and a full dose position. It does not provide a setting for a fifth or partial dose.
| Position | What happens |
|---|---|
| Turn until two clicks | Prime position, shown by the extended line |
| Turn until the knob stops, showing "1" | One full 0.6ml dose |
| Anywhere between | There is no dose setting at this position |
| "0" after injecting | Shows that the dose has been delivered |
The pen is designed to deliver its fixed 0.6 ml dose and does not provide a mechanism for selecting a smaller dose. Once the four prescribed doses have been delivered, an additional complete 0.6 ml dose cannot be dialled. Medicine may still be visible in the pen, but the remaining amount is not a further measured dose.
The Lines on the Pen Are Not a Dose Gauge
This can be confusing. Lilly states that the lines on the KwikPen are not intended to show how many doses remain.
Seeing liquid above a line does not tell you how much medicine is left or whether there is enough for another dose. The amount should not be estimated by looking at the pen.
The Bigger Risk Is Losing Your Fourth Dose
This is an important point that can easily be missed.
Overpriming can result in insufficient medicine remaining for the fourth dose. If you prime more times than needed, whether by accident or by turning the knob too far and repriming, additional solution is used and there may not be enough remaining for the fourth injection.
If you dial beyond the prime position without pressing the dose knob, the manufacturer's guidance states that you can turn the dose knob in either direction until the prime position lines up with the dose indicator.
Priming is complete when a small amount of medicine appears at the needle tip. A continuous stream is not required. If you are unsure whether you have primed the pen correctly, follow the Instructions for Use rather than repeatedly priming.
Does a Higher Strength Pen Leave More?
Questions such as can I get 5 doses out of my Mounjaro pen and can you get 5 doses out of a Mounjaro pen can sometimes come from the assumption that a higher strength pen contains more liquid to work with.
It does not work that way. Every strength from 2.5mg to 15mg delivers the same 0.6ml per dose. The strengths differ in the concentration of tirzepatide, not the volume delivered per dose.
Each Mounjaro KwikPen contains four doses of 0.6 ml, giving 2.4 ml of solution in the four prescribed doses. A small amount of excess solution may remain after the four doses. The volume per dose remains the same across strengths from 2.5 mg to 15 mg.
Because the concentration differs between strengths, the amount of tirzepatide represented by an unmeasured remainder also differs. This is another reason why the leftover liquid should not be treated as a usable dose.
The UK product information allows the dose to be increased in 2.5 mg increments, with adults remaining on a particular dose for at least four weeks before moving to a higher dose where clinically appropriate. Dose changes should only be made on the advice of your prescriber.
It is also important to check which version of the KwikPen you have. Eli Lilly states that modified and initial versions may look slightly different but work in the same way. The current UK product information continues to state that four doses of 0.6 ml can be administered and that any excess solution remaining after use should be discarded.
Attempting to extract a fifth dose or a smaller dose from the remaining liquid is not supported by the product instructions. The remaining fluid is not a measured dose and could result in an unknown amount being administered.
Always follow your prescriber's instructions and speak to them if you have concerns about dose changes, side effects or your supply.
Why the 5th Dose Question Is So Common
Mounjaro pen 5th dose, 5th dose Mounjaro, Mounjaro 5th dose in pen, Mounjaro extra dose in pen and is there a 5th dose in Mounjaro pen are searched frequently, and the reasons behind these questions are understandable.
You are not the only person wondering about the remaining liquid. A January 2026 survey reported in The Pharmaceutical Journal found that 32% of current weight loss injection users surveyed said they had not taken their medicine as prescribed. Of those respondents, 23% said they had combined residual product from pens to create an additional dose.
If you are considering doing something similar, it is better to raise the concern with your prescriber or pharmacist. Questions about cost, supply, side effects or dose changes are all reasonable reasons to ask for advice.
The Real Motive Usually Has a Legitimate Answer
| What is actually driving it | The route to discuss |
|---|---|
| Cost, wanting to stretch a pen | A conversation about strength and supply, since prices can vary between strengths |
| Running out before the next order | Ordering earlier, or discussing supply timing with your prescriber |
| Side effects, wanting less | Discussing whether staying on the current strength for longer or changing strength is appropriate |
| Not wanting to waste medicine | Understanding that the remaining liquid is not a prescribed additional dose |
| A pen that gave fewer than four doses | Possible overpriming, a needle problem or a device issue that may need checking |
The key point is that the remaining liquid is not a dose that you are expected to recover. It should not be measured or injected simply because it is still visible in the pen.
How to Get the Last Dose Out of a Mounjaro Pen
How to get the last dose out of Mounjaro pen and how to get an extra dose from Mounjaro pen are worth separating because one refers to a prescribed dose and the other refers to leftover medicine.
If you are having difficulty delivering one of the four prescribed doses, follow the Instructions for Use supplied with your pen rather than trying to improvise. If the pen does not appear to deliver a dose correctly, contact your pharmacist, prescriber or the manufacturer for advice.
If you mean trying to obtain a fifth dose after the four prescribed doses have been delivered, the KwikPen does not provide a way to dial another complete dose. Trying to use the remaining medicine could result in an unknown amount being administered.
Many users look for ways to get the 5th dose out of Mounjaro pen in online communities, but these methods are not part of the manufacturer's instructions. The leftover medicine is not a pre-measured dose and should not be used.
If you need a lower dose or a change to your treatment plan, speak to your prescriber. The appropriate pen strength and dosing schedule should be based on your prescribed treatment.
If Your Pen Seems to Have Run Out Early
Overpriming can be one reason a pen may not provide all four doses. Other possibilities include a blocked needle, storing the pen with a needle attached, or a genuine device fault.
Pens should be stored with the cap on, clean and dry, and never with a needle left attached. Leaving a needle attached can cause leakage or allow air to enter the cartridge.
If you believe a pen is faulty, contact the manufacturer or your pharmacy for advice. Suspected defects can also be reported through the MHRA Yellow Card scheme.
If you notice an issue with the pen's mechanism or believe it is not delivering the expected amount, speak to your healthcare professional before trying to correct the problem yourself.
Remember, the liquid remaining after four doses is not a fifth dose. If you have concerns about your treatment or whether your pen has delivered the correct dose, follow the Instructions for Use and speak to your prescriber or pharmacist.
Can You Use the 5th Dose of Mounjaro?
Can you use the 5th dose of Mounjaro and can you get a 5th dose from Mounjaro deserve a direct answer.
The remaining liquid after four doses cannot be dialled as another complete dose, and any amount removed by another method would be unmeasured. You would not know how much tirzepatide you had taken.
The UK product information specifies 2.5 mg once weekly as the starting dose. An unmeasured amount of leftover solution should not be treated as a lower dose or used in place of a prescribed strength.
If you are concerned about your dose, supply or treatment progress, speak to your prescriber. They can review your treatment and advise whether any change is appropriate.
What to Do If You Are Running Short
The most useful answer to a supply problem is to discuss it with your prescriber or pharmacy.
If you are experiencing side effects, have concerns about your current dose or are having difficulty obtaining your next pen, speak to your prescriber. The UK product information states that adults should remain on a particular dose for at least four weeks before increasing to a higher dose where an increase is clinically appropriate. Any change in strength should be decided by your prescriber.
You can read more about Mounjaro treatment and how supply works, and our wider weight loss treatments pages set out the options available with a prescription.
Medical Disclaimer
This page explains how the Mounjaro KwikPen is designed and why it provides four fixed doses rather than a fifth dose. It is general information published by a UK pharmacy for educational purposes. It is not medical advice, a diagnosis or a substitute for a consultation with a pharmacist, GP or other appropriately qualified prescriber who knows your medical history.
Nothing on this page should be used to alter, divide, delay, repeat or otherwise change a prescribed dose. Descriptions of how the device works are provided to help you understand what your pen does and are not administration guidance. Always follow the Instructions for Use supplied with your pen and the directions given by your prescriber.
Extracting, combining or injecting residual solution from one or more pens is not a recommended or licensed use of the product. The remaining solution is not an additional prescribed dose, and the UK Patient Information Leaflet instructs patients not to use medicine remaining after the four prescribed doses.
Treatment suitability, strength and quantity are decided by a prescriber following an individual assessment, and treatment response can vary between people.
If your pen appears faulty, has delivered fewer than four doses, or you are unsure whether a dose was given, speak to a pharmacist or prescriber rather than trying to correct the problem yourself. Suspected device defects and side effects can be reported through the MHRA Yellow Card scheme.