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Weight loss injections/treatments

Discuss weight-loss injections and treatments, including personal experiences. Mumsnet hasn't checked the qualifications of anyone posting here. You may wish to speak to a medical professional before starting any treatments.

Longest you have made a pen last

48 replies

Elsiedarlingputthekettleon · 12/09/2025 20:17

Hi all,
The title really, how long if you are micro dosing or spreading doses, reduced dose with higher pen etc etc. I know it says 30 days but people often comment they go longer with them. Thanks

OP posts:
NotPerfectlyAdverage · 14/09/2025 01:07

Started my 10mg pen on the 6th of August and for various reasons I have used 2.5 and 5mg doses. Mainly because I went away and didn't want to not enjoy food and feel sick. I am sticking at 5mg but going away again for a week so that's another 5mg. I think that pen will be 9 weeks. I'd not recommend it either but it was that or come off as I also couldn't get any pen for three weeks whist it was my last pen. I'm going to do the same with my next pen.

This was never my intention but I wouldn't have started at all if I'd known it was going up so much. It's this or stop.

NotPerfectlyAdverage · 14/09/2025 01:08

notnorman · 13/09/2025 15:02

i Do 5mg from a 10mg pen every ten days. So a long time! It’s fine. Wash hands, use a wipe on the pen where the needle goes in, etc

How do you order new pens with such long gaps? That's my next worry

Nomoretopswithblacktrousers · 14/09/2025 01:10

9 weeks for me. No issues at all.

PearlsPearl · 14/09/2025 05:11

Hey OP, I’ve done 8 weeks from 1 pen but plan on doing much longer now as I’m on 2.5 from 7.5 pens that I bought before the price increase.

Ive had the same journey as you re side effects- week 2/3 on 5 made me incredibly unwell. It’s because it builds in your system and clearly mine couldn’t hack it, I went back to 2.5 and was still unwell (because of it building in your body!!). So I’m having a 3 week break then starting again as I just wanna get it all out of me as was so poorly.

smilingfanatic · 14/09/2025 05:57

I am on about week 8 of a 7.5mg with no issues. I will get a few more weeks out of it. I am very careful with pen cleaning and always keep in fridge. Seems to be working OK. No suppression difference.

Superstar22 · 14/09/2025 07:17

I started in June & I’ve only ever taken 2.5mg from a 5mg pen. I’m now wondering whether to buy a 7.5mg pen so it lasts 12 weeks (3x 4 doses…) I do have 2x5mg pens in the fridge to start beforehand. So that’s 8 weeks in each pen. I imagine after this 5 or 7.5mg pen that I buy today, that will me done, and I’ll come off or do one pen of 1mg… advice welcome.

Fedupbeingfat · 14/09/2025 07:51

roycroppersshopper · 13/09/2025 16:25

Has anyone got or seen a chart that gives you the amount of drug and how many ml needed, just thinking about buying a pen and making it last longer than 5 weeks.

https://www.vrgrowth.co.uk/mounjaro-clicks

calculator

Mounjaro Click Count & Dose Calculator | Fat Old Climber

Mounjaro click count & dosing calculator. Calculate injections, costs per week, savings & dose schedules. Ideal for weight loss and saving money on Mounjaro.

https://www.vrgrowth.co.uk/mounjaro-clicks

roycroppersshopper · 14/09/2025 09:45

MagnoliaTreePetals · 13/09/2025 17:39

Hello @roycroppersshopper hope this helps:
https://monj.co.uk/monj-mounjaro-click-chart/

Thanks so much!

Elsiedarlingputthekettleon · 14/09/2025 11:17

It seems that more people will be making the conscious choice to make pens last due to costs now too. I wonder how providers will react. Unless you have a lot to lose and buy as normal and then jjust calculate what roughly you will need and then stop purchasing. This price increase has made people do this, so they should be expecting it.

OP posts:
BamberGirl · 14/09/2025 18:35

@Elsiedarlingputthekettleon yes as I’m off MJ now, just used it for a month as a pre holiday boost after gaining 3 kg.
appreciate that this goes against all advice but as pen is within the expiry I don’t see an issue.

caniaffordit · 15/09/2025 09:17

im so glad I have found a sensible discussion on this subject. I have always used the golden dose and made pens last a week or so longer than 30 days.

I now intend to keep ordering every month to maintain my prescribing history, but order increasing dose pens till I get to 15, but stay on low doses and use the pens for a lot longer. per dose, even at the increased price the 15 pen is the most cost effective per ml.

the price hike has forced my hand and its useful to hear from people who have already done this.

it does mean I will have a stash, but I intend to monitor expiry dates and just see how I go for now.

I do wonder how people manage to get a new pen if they have an ordering gap, has that happened to any of you?

KitsyWitsy · 15/09/2025 09:43

I think probably 7 weeks is my max at the moment. I currently take 10mg from a 15mg pen per week so that is about 7.5 weeks currently with the extra dose. I bought a couple of pens before the price hike and I am not planning on buying more for a while. I have 4 full pens in the fridge. I guess, I am hoping they last me and I can then just do regular diet and exercise. I would like to get off the Mounjaro at some point if I can. I was always prepared to stay on it forever, but I have really been struggling with bloating and stuff lately and it makes me very tired a lot.

MeridaBrave · 15/09/2025 10:09

caniaffordit · 15/09/2025 09:17

im so glad I have found a sensible discussion on this subject. I have always used the golden dose and made pens last a week or so longer than 30 days.

I now intend to keep ordering every month to maintain my prescribing history, but order increasing dose pens till I get to 15, but stay on low doses and use the pens for a lot longer. per dose, even at the increased price the 15 pen is the most cost effective per ml.

the price hike has forced my hand and its useful to hear from people who have already done this.

it does mean I will have a stash, but I intend to monitor expiry dates and just see how I go for now.

I do wonder how people manage to get a new pen if they have an ordering gap, has that happened to any of you?

Edited

I think the issue is that after a gap you need to go back to 2.5mg. Some pharmacies allow a gap up to a year.

Elsiedarlingputthekettleon · 15/09/2025 22:16

I didn't realise you could have a gap and then return. But you would have to still need to meet the prescribing requirements?

OP posts:
BamberGirl · 15/09/2025 22:23

I had an ordering gap, as I finished regular orders in December, then decided to reorder about Feb to have one pen in reserve.

I had a BMI of 26 or 27 and had to submit new photos and scales pic but was no issue. Once approved I was able to order a 5 mg pen even though there had been a breaking 3 months.

HappyWineDay · 15/09/2025 22:32

@Happycyclist ”a 1kg stork margarine tub”
that takes me back and made me smile!

MeridaBrave · 15/09/2025 22:35

Elsiedarlingputthekettleon · 15/09/2025 22:16

I didn't realise you could have a gap and then return. But you would have to still need to meet the prescribing requirements?

Some pharmacies will let you have a break even with a lower BMI.

Dublassie · 15/09/2025 22:37

I think the pharmacies will become more flexible on ordering gaps , if they want to keep business . Of course people will order higher doses and take lower doses from them. I already am doing that .

Happycyclist · 15/09/2025 22:39

Works a treat for me...holds loads and as there is another (sometimes two) full one in front or above it no reason for anyone to look inside. Although my stockpile is getting large so I may soon need a second storage tub.

How could I explain 4kg of Stork margarine...
To be honest i I don't anyone to question them..

HappyWineDay · 17/09/2025 15:53

Happycyclist · 15/09/2025 22:39

Works a treat for me...holds loads and as there is another (sometimes two) full one in front or above it no reason for anyone to look inside. Although my stockpile is getting large so I may soon need a second storage tub.

How could I explain 4kg of Stork margarine...
To be honest i I don't anyone to question them..

My tupperware sits in the fridge inside a wine box, from which I've removed the empty bag!

Elsiedarlingputthekettleon · 18/09/2025 14:37

Loving the stork tubs and empty wine box stories 😂 Thanks for the info re breaks and reordering and lower BMI too. I am hoping not to have to order any more pens, but never say never!

OP posts:
HappyWineDay · 02/10/2025 15:49

"I now intend to keep ordering every month to maintain my prescribing history, but order increasing dose pens till I get to 15, but stay on low doses and use the pens for a lot longer. per dose, even at the increased price the 15 pen is the most cost effective per ml."
@caniaffordit this is exactly what I plan to do. I will order every month (or 5 weeks or so if I can push it) and I'll work out how big a stock I will need for titrating down, when I get closer to my ultimate goal weight. I plan on having maybe 6 months or maybe a bit longer, after reaching goal.
Using a 15mg pen is the most cost effective "price per dose" whatever you are on.

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