{"id":13957,"date":"2025-03-26T11:08:00","date_gmt":"2025-03-26T11:08:00","guid":{"rendered":"https:\/\/www.simpleonlinepharmacy.co.uk\/health-advice\/?p=13957"},"modified":"2025-11-19T12:10:35","modified_gmt":"2025-11-19T12:10:35","slug":"combat-mounjaro-fatigue","status":"publish","type":"post","link":"https:\/\/www.simpleonlinepharmacy.co.uk\/health-advice\/weight-loss\/mounjaro\/combat-mounjaro-fatigue\/","title":{"rendered":"Mounjaro Fatigue: Why It Happens & Simple Steps to Combat It"},"content":{"rendered":"\n

Last updated:<\/strong> 19 November, 2025<\/p>\n\n\n\n

If you are feeling sluggish or tired on Mounjaro, you\u2019re not alone. Many patients report feeling fatigued and low on energy on the treatment.<\/p>\n\n\n\n

As it\u2019s still a relatively new medication, we don\u2019t yet know why<\/em> you might experience Mounjaro fatigue. However, there are several possible explanations for it. And the good news? You can feel more energised by taking a few simple steps.<\/p>\n\n\n\n

To help you feel your best during your treatment, this article explores the link between Mounjaro (tirzepatide) and fatigue. And we\u2019ll provide practical tips to combat exhaustion on your weight loss journey, so you can focus on building long-term health gains.<\/p>\n\n\n\n

Can Mounjaro Make You Tired?<\/h2>\n\n\n\n

Yes. Mounjaro can make you tired.<\/p>\n\n\n\n

Not everyone will feel tired on Mounjaro, but it\u2019s a common Mounjaro side effect<\/a>. It affects between one in 10 and one in 100 patients.<\/p>\n\n\n\n

Most patients will experience tiredness when they\u2019re starting Mounjaro and it’s usually temporary. You should feel less fatigued as your body adapts to both the treatment and new lifestyle changes.<\/p>\n\n\n\n

Why Does Mounjaro Make You Tired?<\/h2>\n\n\n\n

There are no clinical studies explaining why <\/em>you might lack energy on Mounjaro injections<\/a>.<\/p>\n\n\n\n

However, Mounjaro works by mimicking two hormones, naturally produced in the body, that help regulate appetite and blood sugar. These hormones are glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1).<\/p>\n\n\n\n

By mimicking these hormones, Mounjaro slows down the rate at which food leaves the stomach (known as \u201cdelayed gastric emptying\u201d). This means you feel fuller quicker and stay fuller for longer.<\/p>\n\n\n\n

So, while we don\u2019t know the exact cause, there are some theories that could explain why you feel tired. Here are some possible explanations.<\/p>\n\n\n\n

You\u2019re Eating Less<\/h3>\n\n\n\n

Mounjaro reduces your appetite and makes you feel full sooner, which is why it\u2019s such an effective weight loss treatment. However, if you eat too little on Mounjaro<\/a>, this might contribute to fatigue.<\/p>\n\n\n\n

\u201cMounjaro often leads to a significant decrease in food intake, which can lead to consuming fewer nutrients. This can ultimately impact your energy levels,\u201d Laura Perez, Lead Dietitian at Simple Online Pharmacy<\/strong>, explains.<\/p>\n\n\n\n

Mounjaro Impacts Your Hormones<\/h3>\n\n\n\n

Mounjaro injections affect your metabolism by influencing hormones that regulate blood sugar<\/a> and appetite. These metabolic changes might make you feel tired, especially during the initial adjustment period.<\/p>\n\n\n\n

Side Effects Can Cause Fatigue<\/h3>\n\n\n\n

Potential side effects include diarrhoea, being sick and nausea<\/a>, which can increase the risk of dehydration and electrolyte imbalances. Both of these can cause tiredness and fatigue.<\/p>\n\n\n\n

Mounjaro Might Affect Your Sleep Cycle<\/h3>\n\n\n\n

Mounjaro works by sending signals<\/a> to the area of your brain that produces hormones controlling hunger, body temperature and mood.<\/p>\n\n\n\n

This area (the hypothalamus) also regulates sleep<\/a> and wakefulness. So it\u2019s possible the medication could be impacting your sleep-wake cycle.<\/p>\n\n\n\n

Your Blood Sugar is Low<\/h3>\n\n\n\n

Mounjaro doesn\u2019t directly cause low blood sugar. However, there is some association between GLP-1 receptor agonists and low blood sugar<\/a>.<\/p>\n\n\n\n

Low blood sugar is common in patients using GLP-1 pens alongside type 2 diabetes medication. (For example, sulphonylurea and\/or insulin medication.)<\/p>\n\n\n\n

Malnutrition can also lead to low blood sugar. So you could experience it if you\u2019re undereating on Mounjaro.<\/p>\n\n\n\n

Symptoms of low blood sugar may include feeling tired or weak, as well as headaches, dizziness and hunger. You may also feel cold, as your body struggles to regulate body heat. If you think you have low blood sugar, contact your healthcare provider.<\/p>\n\n\n\n

How to Combat Mounjaro Fatigue<\/h2>\n\n\n\n

To combat fatigue, focus on making small adjustments to support your overall wellbeing. <\/p>\n\n\n\n

As you incorporate the following strategies, you’ll likely begin to feel better throughout your weight loss journey.<\/p>\n\n\n\n

Eat Enough Nutrient-Dense Food<\/h3>\n\n\n\n

Eating enough nutrient-dense foods is one of the best ways to combat fatigue on weight loss medications. Avoid skipping meals completely.<\/p>\n\n\n\n

\u201cEven if you aren\u2019t able to eat large portions, focus on nutrient-dense foods. This will provide essential vitamins and minerals that help maintain your energy levels,\u201d Laura advises.<\/p>\n\n\n\n

\u201cIncorporate a variety of fruits, vegetables, whole grains, lean proteins and healthy fats into your meals. This way you can ensure you\u2019re getting the necessary nutrients to support your body.\u201d<\/p>\n\n\n\n

These foods will provide a steady energy source throughout the day. Avoid simple sugars and highly processed foods. They can cause rapid spikes and crashes in energy, which is exactly what we want to avoid.<\/p>\n\n\n\n

Remember to aim for steady weight loss of 1-2 lbs per week, rather than rapid weight loss. This will help you sustain your success in the long-term.<\/p>\n\n\n\n

Exercise Regularly<\/h3>\n\n\n\n

Exercise can boost energy levels, improve your mood and promote better sleep. Some studies<\/a> have also found gentle exercise can help combat fatigue.<\/p>\n\n\n\n

Of course, exercise might seem like the last thing you want to do when feeling tired. But some light exercise every day can make you feel more awake and energised.<\/p>\n\n\n\n

Pushing yourself too hard can make you even more tired. Listen to your body and avoid overly intense workouts.<\/p>\n\n\n\n

Start small, with gentle exercises like walking, yoga or swimming. Gradually increase the intensity and duration of your workouts as your energy levels improve.<\/p>\n\n\n\n

Build a Sleep Routine<\/h3>\n\n\n\n

\u201cPrioritise rest and make sure you\u2019re getting enough sleep. Recovery is vital for maintaining your overall wellness,\u201d Laura says.<\/p>\n\n\n\n

A consistent sleep routine can regulate your body’s natural sleep-wake cycle<\/a>. This cycle is \u201cnecessary to replenish and heal the body to ensure that it can function properly\u201d. It will help you recharge and feel energised the next day.<\/p>\n\n\n\n

Here are some steps you can take for better sleep:<\/p>\n\n\n\n