Fasting during Ramadan presents unique challenges for individuals managing their weight management journey with medications such as Mounjaro. If you are currently using Mounjaro during Ramadan, or you are considering starting treatment, it is natural to question how long fasting hours, changes in meal timing, and altered sleep patterns may affect both the safety and effectiveness of your injections.
During Ramadan, daily routines shift significantly. Suhoor and iftar replace regular daytime meals, hydration patterns change, and energy levels can fluctuate. These adjustments may influence how you feel on treatment, particularly if you experience appetite suppression or digestive side effects. Planning when to take your injection, ensuring adequate fluid intake outside fasting hours, and monitoring how your body responds are all important considerations when using Mounjaro during Ramadan.
In this article, we explore the potential risks and benefits of using Mounjaro while fasting, along with practical guidance to help you plan ahead. If you would like personalised advice about your treatment, contact us to discuss your situation or arrange an online consultation with one of our healthcare professionals.
Mounjaro, or tirzepatide, is an MHRA-approved medication designed to help individuals with type 2 diabetes and those looking for effective weight loss solutions. It mimics two hormones:
These hormones regulate blood sugar and appetite, slowing gastric emptying and reducing hunger. This helps people lose weight more effectively and makes Mounjaro an effective tool to kick-start sustainable weight loss.
Key benefits of the weight loss medication include:
Together, these benefits support steadier appetite control, improved metabolic health, and sustainable long-term weight management when used consistently and under medical guidance.
Many people worry that taking an injection while fasting may invalidate their fast. However, essential medical treatments, including weight loss injections such as Mounjaro and Wegovy, are generally considered permissible during Ramadan.
Islamic scholars commonly place non-nutritional injections into the category of necessary medical treatment, meaning they do not break the fast. If your medication is important for your health, you should not feel pressured to stop without proper medical advice.
There are still some practical considerations to keep in mind:
With the right guidance and planning, many people are able to continue treatment confidently while observing their fast.
Potential side effects include:
To minimise these, you may prefer to schedule your injection during non-fasting hours. Many people choose to take it after iftar, once they have broken their fast and rehydrated, or before suhoor, ahead of the pre-dawn meal. Planning your dose at a time that feels manageable for you can make it easier to stay consistent with treatment while observing your fast.
Mounjaro is administered once weekly as a subcutaneous injection, which means it does not need to be taken with food. However, during Ramadan, eating patterns change significantly. Long fasting hours followed by larger meals at iftar can sometimes make digestive side effects feel more noticeable. Being mindful of portion sizes, hydration, and how your body responds can help you manage treatment comfortably throughout the month.
Mounjaro works by keeping blood sugar stable, but during fasting, your body may react differently:
While Mounjaro can be safely used in many cases, some individuals should take extra caution or avoid it altogether:
If you decide to continue using Mounjaro while fasting, consider the following tips to minimise risks and maximise effectiveness:
The best time to take Mounjaro is at your suhoor, rather than after your iftar. This will help you feel full while the medicine is released throughout the day.
Some consider fasting before Ramadan while using the injection. This can help you assess how your body responds, and so help you manage your medication during the fasting period. It will also give you a guide on how side effects may differ while you fast, and prepare you better for Ramadan.
If you feel weak, dizzy, or nauseous, adjust your meal plan. Consult your healthcare provider immediately if symptoms become severe.
Endocrinologists and diabetes specialists recommend that individuals on GLP-1 receptor agonists like Mounjaro discuss fasting with their clinician beforehand.
According to a study published in the Diabetes, Obesity & Metabolism Journal, Mounjaro is effective for weight loss but may require dosage adjustments during prolonged fasting.
However, you are more than a statistic in a clinical study. Your lifestyle, medical history, and personal goals all matter. If you are considering using Mounjaro during Ramadan and would like tailored guidance, reach out to our team for personalised support and advice.
Using weight management medication during Ramadan is not limited to one treatment, and each option works slightly differently. While much of the focus is often on Mounjaro during Ramadan, it is important to understand how other medications may fit around fasting, meal timing, and changes in routine. The way a medicine is taken, how often it is used, and its side effect profile can all influence how manageable it feels while fasting.
Because these medications differ in how they are administered and how they affect appetite and digestion, the best approach during Ramadan will depend on your individual health needs and lifestyle. Speaking to a healthcare professional before making changes can help ensure you continue your weight management journey safely while observing your fast.
Yes, fasting may enhance weight loss due to caloric restriction, but it can also lead to muscle loss and dehydration if not managed properly.
It depends on how well you tolerate it. If fasting makes you feel too weak, nauseous, or dehydrated, consider skipping Mounjaro during this period or adjusting your dosage under medical supervision.
Yes, since it suppresses appetite, it may help you control portion sizes, reducing the risk of post-fasting binge eating.
Diabetics should consult their doctor before fasting while on Mounjaro, as it may increase the risk of hypoglycemia or dehydration.
Mounjaro can be safe and effective for weight loss during Ramadan, but only if used responsibly. If you choose to continue using it while fasting, ensure you:
Fasting while on Mounjaro requires careful planning and medical guidance to ensure it remains safe and beneficial for your weight loss journey.
If you’re a patient with The Care Pharmacy who is prescribed weight loss treatments, our clinicians are here to help. Feel free to email us at info@thecarepharmacy.com with any questions about managing your medication during Ramadan, or contact us online.
This blog was updated in collaboration with Pharmacy Mentor on 18/02/2026.
Medically reviewed by
Superintendent Pharmacist
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