card, none, titleone-fs-28px, description-fs-16px, ctatype-textlink, ctacolor-light, ctastyle-primary, ctatarget-sametab, ctaexitinterstitial-select, ctatype-textlink-two, ctacolor-light-two, ctastyle-primary-two, ctatarget-sametab-two, ctaexitinterstitial-select-two, ctanumber-one
Person exercising on a squat machine at the gym

Biology

In people living with obesity, disrupted hormone signals can drive increased hunger, reduced feelings of fullness, and metabolic changes that create a biological resistance to weight loss.3,4,6,7
card, none, titleone-fs-28px, description-fs-16px, ctatype-textlink, ctacolor-light, ctastyle-primary, ctatarget-sametab, ctaexitinterstitial-select, ctatype-textlink-two, ctacolor-light-two, ctastyle-primary-two, ctatarget-sametab-two, ctaexitinterstitial-select-two, ctanumber-one
Person holding a donut in one hand and a green apple in the other

Lifestyle

Consumption of food and level of physical activity can influence the risk of obesity. It is important to remember that lifestyle is one of the many factors that can contribute, but it’s often not the only one.3,6
card, none, titleone-fs-28px, description-fs-16px, ctatype-textlink, ctacolor-light, ctastyle-primary, ctatarget-sametab, ctaexitinterstitial-select, ctatype-textlink-two, ctacolor-light-two, ctastyle-primary-two, ctatarget-sametab-two, ctaexitinterstitial-select-two, ctanumber-one
A home office set up with desk, computer and exercise bike.

Environment

Environmental factors that contribute to obesity include easy access to highly processed foods, increasingly urbanised environments, and sedentary lifestyles with reduced physical activity.3,6 
Societal and cultural factors can also shape the environments we live in and influence how obesity 
is perceived and managed.3
reduce-body-weight
Reduce and control body weight
tile-eyebrow, title-fs-32px
lower-bodt-fat
Lower body fat
tile-eyebrow, title-fs-32px
reduce-appetite
Reduce appetite and how much food is eaten
tile-eyebrow, title-fs-32px
slow-down
Slow down how quickly food 
leaves the stomach
tile-eyebrow, title-fs-32px
Mounjaro is a type of medicine called a 'GIP and GLP-1 receptor agonist', which is used to help reduce weight or maintain weight loss.1‡
‡Individual patient results may vary.
eat-smaller-meals
Eat smaller meals
tile-eyebrow, title-fs-32px
eat-slowly
Eat slowly
tile-eyebrow, title-fs-32px
avoid-fried-foods
Avoid fried or fatty foods
tile-eyebrow, title-fs-32px

Frequently Asked

Questions

How often do you take Mounjaro?

Mounjaro is a medicine you take once every week, and it should be taken on the same day each week, if possible. You can inject Mounjaro at any time of day, with or without food. Some patients find using a calendar helps them remember when to take their Mounjaro. They tick the day of the week that they take their first dose of Mounjaro.9

How is Mounjaro taken?

Mounjaro is injected under the skin (subcutaneous injection) of the stomach (abdomen) or upper leg (thigh). The injection site should be changed to a different area of the body each week. This helps reduce potential pain and irritation. You can inject the same area of the body each week, if you choose to do so, but you should choose a different injection site within that area.9

Do people experience side effects?

As with all medicines, Mounjaro can have side effects. The most common side effects with Mounjaro are nausea, diarrhoea, vomiting and constipation. These side effects are usually not severe. Serious side effects can occur and may require urgent medical attention. These include inflamed pancreas (acute pancreatitis, which involves sudden, severe pain in the stomach and back), gallbladder complaints, and allergic reactions. For a list of side effects and what to do when a side effect occurs, please refer to section 6 of the Mounjaro Consumer Medicine Information.9

Does Mounjaro affect fertility or pregnancy?

The effects of Mounjaro on human fertility are unknown. Mounjaro should not be used during pregnancy, the effects of this medicine have not been studied. If there is a chance someone could become pregnant while using Mounjaro, it is recommended they use contraception (birth control). People who take oral contraceptive (“the pill”) should be aware that Mounjaro may affect how it works. They should switch to a different type of birth control medicine or add a barrier method of birth control (e.g., condoms). The barrier method should be used for 4 weeks from the start of treatment and for 4 weeks each time the dose of Mounjaro is increased.9

Can you travel with Mounjaro?

Yes. However, you should tell your doctor, pharmacist, or nurse if you are planning to travel overseas. You may not be able to bring Mounjaro to the country you are visiting, and you may need to carry a letter explaining why you are travelling with an injecting device.9

Your doctor, pharmacist, or nurse can provide you with some helpful information on this subject.

What dose strength do people take?

Mounjaro is available in six dose strengths. Your doctor will start you on the lowest dose at 2.5 mg once a week for 4 weeks. After that your doctor will increase your dose to 5 mg once a week.9

Your doctor may choose to increase your dose by 2.5 mg increments every 4 weeks to achieve a dose of 7.5 mg , 10 mg, 12.5 mg or 15 mg if needed. The maximum dose is 15 mg once a week.9

References

  1. MOUNJARO® Data Sheet, December 2025.

  2. Ministry of Health - Manatū Hauora. Annual Update of Key Results 2024/25: New Zealand Health Survey. Data explorer - Overweight or obese: BMI of 25.0 or greater (or IOTF equivalent for 15-17 years). Available at: https://statics.teams.cdn.office.net/evergreen-assets/safelinks/2/atp-safelinks.html [Accessed May 2026].

  3. Rubino F, et al. Lancet Diabetes Endocrinol. 2025:13(3):221–62.

  4. Hall KD, Kahan S.  Med Clin North Am.  2018;102(1):183–97.

  5. Apovian CM, et al. J Clin Endocrinol Metab. 2015;100(2):342–62.

  6. Greenway FL.  Int J Obes (Lond).  2015;39:1188–96.

  7. Ochner CN, et al. Physiol Behav. 2013;120:106–13.

  8. Maceira E, et al. Ann Palliat Med. 2012;1(2):161–76.

  9. MOUNJARO® Consumer Medicine Information, December 2025.