This guide sets out what the SmPC and NHS do and do not say about Mounjaro and mood, why mood can still feel different around treatment, why not to stop mental-health medicines on your own, and how to get support. It draws on the UK Summary of Product Characteristics and the NHS. This is a sensitive topic; if you are struggling with your mental health, please speak to your doctor or another trusted source of support.
Does Mounjaro affect mood?
On the evidence in the licence, depression, low mood and other psychiatric effects are not listed as recognised side effects of tirzepatide 1. The SmPC's adverse-reaction table covers effects like gut symptoms, dizziness and injection site reactions, but does not list mood disorders 1.
The NHS side-effect information for tirzepatide likewise does not list depression or mood changes 2. So this guide does not claim that Mounjaro causes low mood, because the corpus does not establish that 12.
Equally, this guide makes no claim that the medicine improves mood1. The honest position is that mood is not among the listed effects either way, while still being something worth taking seriously if you notice changes, which the rest of this guide covers 12.
What the SmPC and NHS say
To be precise about the sources: the Mounjaro SmPC lists its recognised adverse reactions by body system, and psychiatric disorders such as depression or anxiety are not among them1. The most common listed effects are gastrointestinal, with others including dizziness and injection site reactions 1.
The NHS patient information for tirzepatide similarly lists common and serious side effects without including mood or depression 2. So neither the licence nor the NHS patient guidance describes a mood side effect 12.
This guide therefore does not assert one 1. Where you may have read about wider reviews of this class of medicine and mood, those are beyond the SmPC and NHS sources used here, so this guide does not state them as established; a clinician can discuss the current picture with you 2.
Being careful here is deliberate 1. Mood is an area where it is easy to overstate either direction, claiming a medicine causes depression on the basis of individual reports, or that it lifts mood as a bonus, and neither is supported by the listed evidence for tirzepatide 12. Holding to what the sources actually say protects you from both a false alarm and a false reassurance, while leaving room to take your own experience seriously, which the following sections do 12.
Why mood can still feel different
Even without a listed mood effect, it is understandable that some people notice changes in how they feel around starting a weight-loss medicine, and it is worth acknowledging that rather than waving it away 1. Significant changes in eating, weight and routine, and the emotions tied up with weight, can all affect how someone feels, independently of any direct drug effect 1.
In diabetes, there is also a specific overlap: the symptoms of low blood sugar, which the NHS lists as including feeling weak, confused, shaky and sweaty, can feel unsettling and be mistaken for a mood or anxiety change 2. So in that setting, what feels like a mood symptom may sometimes be a blood-sugar one 2.
None of this is a medical claim about the drug causing mood disorders; it is context for why feelings can shift around treatment 12. If you do notice persistent low mood, the next sections cover what to do 2.
It is also worth saying that for some people, changes around weight and eating can be positive for how they feel, while for others a period of big change is unsettling, and both are normal human responses rather than evidence about the medicine itself 1. The important thing is not to talk yourself out of taking a genuine, persistent change in mood seriously just because it is not on a side-effect list 2. A listed side effect and a real experience worth acting on are not the same thing, and this guide treats your experience as valid regardless of what the table says 12.
Considering treatment for weight management? You can start an assessment with a Cloud Pharmacy clinician, who will review your medical history and confirm whether treatment is appropriate.
If you notice low mood
If you notice persistent low mood, loss of interest, or other signs of depression while taking Mounjaro, treat it as something worth acting on rather than ignoring 2. The NHS advises speaking to a pharmacist or doctor about side effects that bother you or do not go away, and a change in mood is a reason to seek that advice 2.
Do not stop the medicine on your own assumption that it is the cause, nor make changes to any mental-health treatment yourself; instead, raise it with a clinician who can look at the whole picture 2. They can help work out what is going on and what would help 2.
Most importantly, if you ever have thoughts of harming yourself or that life is not worth living, please seek help straight away, from your doctor, NHS 111, or emergency services if you are in immediate danger 2. You deserve support, and help is available 2.
Mental-health medicines and Mounjaro together
If you take an antidepressant or other mental-health medicine, there is no specific interaction between it and tirzepatide listed in the SmPC 1. The general point about the medicine affecting the absorption of oral medicines around starting applies, but antidepressants are not singled out for special monitoring like narrow-therapeutic-index drugs 1.
The firm rule is to keep taking your mental-health medicine as prescribed and never stop or change it on your own in order to start or continue a weight-loss medicine 2. Stopping an antidepressant abruptly can cause problems and can risk the return of the symptoms it treats 2.
Any change to your mental-health treatment is a decision for the prescriber who manages it, made with proper support; the two treatments can be managed alongside each other with your prescribers aware of both 12. Our companion guide on Mounjaro and SSRIs covers the interaction question in more detail 1.
The reason this rule deserves emphasis is that the goal of any treatment is to improve your health overall, and that goal is not served by destabilising mental-health treatment that is working 2. If both your weight and your mood matter to you, the constructive path is to keep both sets of prescribers informed and let them coordinate, rather than trading one treatment off against the other yourself 12. Stopping an antidepressant to start a weight-loss medicine is exactly the kind of well-meant but risky step worth avoiding, and a clinician would much rather you asked first than acted alone 2.
Getting support and what to discuss
If mental health is relevant to you, tell your prescriber before starting Mounjaro, including any history of depression or anxiety and any mental-health medicines you take, so your care is informed 2. This is part of the individual assessment the medicine involves 2.
If you notice mood changes during treatment, raise them rather than waiting, keep your mental-health medicines as prescribed, and seek prompt help for any thoughts of self-harm 2. Our guide on how Mounjaro works covers the medicine more broadly 1.
This is a sensitive topic, and it is fine to ask for help. If you are struggling with your mental health, a good first step is talking to your GP or another trusted person, who can help you find the right support 2.
It can also help to involve someone you trust if your mood is low, since talking to a partner, friend or family member can make it easier to take the step of seeking professional support 2. Looking after your mental health is as much a part of looking after yourself as the weight management is, and the two are not in competition; a good clinician will care about both, never treating one as a trade-off against the other 12.
Frequently asked questions
Does Mounjaro cause depression or low mood?
Depression and low mood are not listed as recognised side effects of tirzepatide in the SmPC or NHS patient information, so this guide does not claim the medicine causes them 12. That said, mood matters: if you notice persistent low mood, raise it with a clinician rather than ignoring it or stopping the medicine yourself 2.Is mood a known side effect of Mounjaro?
No, the SmPC's adverse-reaction table does not list psychiatric effects like depression or anxiety, and the NHS side-effect information does not include mood changes 12. Wider class-level reviews are beyond these sources, so this guide does not state them as established; a clinician can discuss the current picture 2.Why do I feel low on Mounjaro if it is not a listed side effect?
Mood can shift around big changes in eating, weight and routine, independently of a direct drug effect, and in diabetes low-blood-sugar symptoms can feel unsettling and be mistaken for a mood change 12. This is context, not a claim the drug causes mood disorders. Persistent low mood is worth raising with a clinician 2.Can I take antidepressants with Mounjaro?
There is no specific interaction between tirzepatide and antidepressants listed in the SmPC 1. Keep taking your mental-health medicine as prescribed and never stop or change it on your own to take a weight-loss medicine; any change is for the prescriber who manages it 2. The two can be managed alongside each other 12.Should I stop Mounjaro if my mood drops?
Do not stop it on your own assumption; raise the change with a clinician who can look at the whole picture 2. The NHS advises speaking to a pharmacist or doctor about side effects that bother you 2. And if you have any thoughts of harming yourself, seek help straight away from your doctor, 111, or emergency services 2.Where can I get support if I am struggling with my mood?
Please talk to your GP or another trusted person, who can help you find the right support 2. If you have thoughts of self-harm or that life is not worth living, seek help straight away from your doctor, NHS 111, or emergency services if you are in immediate danger 2. You deserve support, and help is available.Your next step
Depression and low mood are not listed as recognised side effects of tirzepatide in the SmPC or NHS patient information, so this guide does not claim the medicine causes them, nor that it improves mood. Mood can still shift around big changes in eating and routine, and in diabetes low-blood-sugar symptoms can be mistaken for mood changes. There is no listed interaction between Mounjaro and antidepressants.
If you notice persistent low mood, raise it with a clinician rather than ignoring it or stopping the medicine yourself, keep your mental-health medicines as prescribed, and tell your prescriber about any mental-health history before starting. This is a sensitive topic: if you are struggling, please speak to your GP or a trusted person, and seek help straight away for any thoughts of self-harm. Looking after your mental health is part of looking after yourself, and a good clinician will care about both it and your weight, never treating them as a trade-off against each other.
Disclaimer
This guide is for general information only and does not constitute medical advice, diagnosis or treatment. The information here describes general clinical context based on UK regulatory sources cited above; it is not a recommendation for any specific medicine or treatment, which can only be made by a prescriber following individual assessment.
If you are considering treatment, speak to your GP or pharmacist, or arrange a consultation with a Cloud Pharmacy clinician. Prescription-only medicines are issued only after clinical assessment and where appropriate.
If you experience side effects from any medicine, you can report them through the Yellow Card scheme at yellowcard.mhra.gov.uk.
