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When is the best time to inject Mounjaro or Wegovy?
Medically reviewed by
Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
But it can help to try and align your schedule with when treatments like Wegovy or Mounjaro peak in your body.
Here’s when you should take your injection based on your work, lifestyle or eating habits:
Example 1: Social eater
This person finds it challenging to stick to their diet when hanging out with friends or family on the weekends. They may order one or more appetisers, a main course, and a dessert, or grab snacks while watching a movie. When others around them are eating, they feel compelled to join in.
Solution: The best time for this person to inject may be Thursday evening or Friday morning. Taking the injection at these times should more effectively suppress appetite over the weekend, reducing the likelihood of over-indulging.
Example 2: 9-5 worker
Many people struggle to stay on track in an office environment because their coworkers may go out to lunch or snack together. The commute and long office hours might also lead to ordering food after work because of tiredness.
Solution: A helpful time to inject may be Sunday evening, allowing appetite suppression to take effect from Monday onward. It could also be helpful to meal prep for the coming week in advance, so you have a home-cooked meal to come back to after work. But bear in mind that side effects might be more pronounced during the first few days of work.
Example 3: Shift worker
Shift workers might find it difficult to adhere to their weight-loss plan during long shifts. They may have shorter breaks and limited access to a fridge or microwave, making it easier to grab food on the go. Consistently injecting at the same time each week can also be challenging, especially if working nights and weekends.
Solution: If you have varied shifts, it’s best to stick to one specific day for injections, even if that means you can’t inject at the same time each week. If that’s not possible, consider injecting the following day if you aren’t working. But don’t delay it for longer than three days, as this can reduce the effectiveness of the treatment.
Example 4: Side effect strategist
It’s quite common to experience fatigue, nausea, or diarrhoea after injecting weight loss medication – particularly after first starting treatment or moving up to a new dose. For someone who is concerned about these side effects or feels they may be more affected by them, it’s helpful to schedule on a day that minimally interferes with work.
Solution: The best time for this person to inject could be Friday evening, allowing the weekend for recovery from any potential side effects. If you’re a shift worker, try to inject in advance of one or two days off, so you have time to recuperate.
Example 5: Late-night snacker
This person might successfully avoid junk food and eat healthily during the day, but struggle with late-night snacking as the evening progresses. Sometimes, a late-night snack helps them unwind after a long, stressful day.
Solution: If there’s a specific day of the week filled with meetings that might leave you feeling stressed, try timing your injection for the day before. This will help suppress cravings, reducing the likelihood of nighttime snacking.
While the medication helps decrease physiological hunger by reducing food noise and hunger cues, addressing emotional eating may require additional support. It’s best to go to a therapist if you’re struggling with emotional eating.
Can I change my injection day?
Yes, you can change the day you inject, but it’s best to stick to a consistent schedule each week for the best results. Adjusting very occasionally to a day before or after shouldn’t affect how well the treatment works overall, but if you consistently delay the medication by several days each week, it might make the medicine less effective.
Some weight loss injections have a half-life of seven days, meaning that after this time the concentration of the drug in your body is halved. This reduces its potency, which is why it’s important to administer a dose every seven days to maintain maximum effectiveness.
Additionally, you shouldn’t take the drug a lot earlier than your next scheduled dose. For weekly injections, you typically need to wait seven days before injecting again. While taking it a few hours early shouldn’t cause harm, injecting a few days earlier could lead to higher levels of the drug in your body, which could lead to side effects. For Mounjaro, the manufacturer advises that the minimum interval between doses must be at least three days.
If you are uncertain about how to change your injection day, feel free to ask your clinician for advice.
What should I do if I miss my dose?
What you need to do will be detailed in your patient leaflet that comes with your medicine, or you can find a copy online.
For a weekly injection:
If it’s been five days or less (for Wegovy) or four days or less (for Mounjaro) since your last scheduled injection, use it as soon as you remember, and then continue with your normal schedule on your next injection day.
If it’s been more than five days (for Wegovy) or four days (for Mounjaro) since you were supposed to inject, skip the missed dose and proceed with your next scheduled injection day.
For a daily injection:
If it’s been less than 12 hours since the missed injection, inject it as soon as you remember.
If it’s been more than 12 hours, you should skip the missed dose and return to your regular schedule.
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Disclaimer: The information provided on this page is not a substitute for professional medical advice, diagnosis, or treatment. If you have any questions or concerns about your health, please talk to a doctor.
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