Missed Your Weekly Weight Loss Injection? Here’s What to Do

Missing your weekly weight loss injection can be worrying, especially if you’re unsure whether to take it late, skip it, or wait until your next scheduled dose. The good news is that missing a single injection is usually manageable. What you should do next depends on which medication you’re taking and how much time has passed since your scheduled injection.

If you’re using Wegovy (semaglutide) or Mounjaro (tirzepatide), don’t take two doses to make up for the missed one. Instead, follow the manufacturer’s missed-dose guidance and continue your treatment safely.

This guide explains what happens if you forget your weekly weight loss injection, when to take the missed dose, when to skip it, and when it’s best to contact your prescriber.

Quick Answer: What Should You Do If You Miss Your Weekly Weight Loss Injection?

If you’ve missed your weekly weight loss injection, the correct action depends on your medication and how many days have passed.

Never take two injections together or an extra dose to make up for a missed one. If you’ve missed several weeks of treatment, speak to your prescriber before restarting.

Why Missing One Injection Usually Isn’t a Major Setback

Both Wegovy and Mounjaro are designed to work over time. Because they’re taken once a week, the medication remains active in your body for several days after each injection. Missing a single dose doesn’t mean the treatment stops working immediately or that you’ll lose all the progress you’ve made.

You may notice temporary changes, such as:

• Feeling hungrier than usual
• Reduced feelings of fullness after meals
• Increased food cravings
• A slower rate of weight loss that week

For most people, these effects are temporary and improve once they return to their normal dosing schedule.

What to Do If You Missed a Wegovy Dose

Wegovy is a once-weekly prescription weight loss injection containing semaglutide. To get the best results, it should be taken on the same day each week.

If It’s Been 5 Days or Less

Take your missed injection as soon as you remember.

After taking the missed dose, continue with your next injection on your regular scheduled day, provided there’s enough time between doses according to your treatment plan.

For example:

• Your usual injection day is Monday.
• You remember on Thursday.
• Take the injection on Thursday, then continue your normal weekly schedule.

If It’s Been More Than 5 Days

If more than five days have passed since your scheduled injection, skip the missed dose.

Wait until your next planned injection day and continue your treatment as normal.

Trying to “catch up” by taking the missed dose late can disrupt your dosing schedule and may increase the likelihood of side effects.

What to Do If You Missed a Mounjaro Injection

Mounjaro is a once-weekly injection containing tirzepatide. Although it’s also given weekly, the missed-dose advice is slightly different from Wegovy.

If It’s Been 4 Days (96 Hours) or Less

Take the missed injection as soon as possible.

Once you’ve taken it, continue with your regular weekly schedule unless your healthcare professional advises otherwise.

If It’s Been More Than 4 Days

If more than four days have passed since your scheduled injection, skip the missed dose completely.

Take your next injection on your usual day.

When using Mounjaro, there should always be at least 72 hours between injections, so avoid changing your schedule without professional advice.

Why Are the Instructions Different for Wegovy and Mounjaro?

Although both medications are weekly weight loss injections, they contain different active ingredients and have different manufacturer dosing recommendations.

Wegovy contains semaglutide, while Mounjaro contains tirzepatide, which works by targeting two hormones involved in appetite regulation and blood sugar control. Because of these differences, the recommended missed-dose window isn’t the same.

That’s why it’s important to follow the guidance specific to your prescribed medication rather than assuming the instructions are interchangeable.

Should You Take Two Injections to Catch Up?

No.

If you’ve forgotten your weekly injection, never take two doses together or inject an extra dose to make up for the one you missed.

Taking more medication than prescribed won’t improve your results and may increase the risk of side effects such as:

• Nausea
• Vomiting
• Diarrhoea
• Stomach discomfort
• Dehydration

If you’re unsure whether to take or skip a missed dose, speak to your prescriber or pharmacist before administering your next injection.

What If You’ve Missed More Than One Weekly Injection?

Missing a single dose is usually straightforward to manage, but missing multiple weekly injections may require a different approach.

If you’ve been off your medication for more than a couple of weeks, don’t assume you should restart at your previous dose. Both Wegovy and Mounjaro are introduced gradually to help your body adjust and reduce the likelihood of digestive side effects.

Depending on how long you’ve stopped treatment, your prescriber may recommend restarting at a lower dose before increasing it again. This helps reduce the risk of nausea, vomiting, diarrhoea and stomach discomfort.

If you’re unsure how to restart your treatment, contact your prescriber or pharmacist before taking your next injection.

Will Missing One Dose Affect Your Weight Loss?

Missing one weekly injection is unlikely to undo the progress you’ve already made.

These medications work over time by helping you eat less, feel fuller for longer and maintain healthier eating habits. A single missed dose doesn’t immediately remove these effects, although you may notice that your appetite increases slightly before your next injection.

To stay on track:

• Resume your treatment according to the recommended missed-dose guidance.
• Continue following your healthy eating plan.
• Stay physically active if you’re able.
• Avoid skipping meals or overeating because you’ve missed a dose.

Consistency over weeks and months has a much greater impact on weight loss than one missed injection.

Can You Change Your Weekly Injection Day?

Yes, but it should be done carefully.

If you need to move your injection to a different day, ensure you follow the guidance provided with your medication. There should be an appropriate interval between injections before changing your schedule.

If you’re unsure how to switch your injection day safely, ask your prescriber or pharmacist for advice.

Common Mistakes to Avoid

When people miss a weekly injection, they often make decisions that can increase the risk of side effects or disrupt their treatment.

Avoid these common mistakes:

• Taking a Double Dose: Taking two injections together won’t make up for the missed dose and may increase the risk of side effects.
• Restarting Without Advice After a Long Break: If you’ve missed treatment for several weeks, you may need to restart at a lower dose rather than continuing where you left off.
• Frequently Changing Your Injection Day: Changing your injection day regularly can make it harder to remember your schedule and may increase the chance of missing future doses.
• Ignoring Severe Side Effects: Seek medical advice if you experience severe or persistent vomiting, dehydration, severe abdominal pain or any symptoms that concern you after taking your medication.

Tips to Help You Remember Your Weekly Injection

Forgetting an injection occasionally is common, but a few simple habits can make it less likely to happen again.

Consider the following:

• Set a recurring reminder on your phone.
• Add your injection day to your digital calendar.
• Use a medication reminder app.
• Keep your medication stored as instructed so it’s easy to remember on injection day.
• Link your injection to a regular weekly routine, such as every Sunday evening or Monday morning.

The easier your routine is to follow, the more likely you’ll stay consistent with your treatment.

When Should You Contact Your Prescriber?

Speak to your healthcare provider if:

• You’ve missed multiple weekly injections.
• You’re unsure whether to take or skip a missed dose.
• You’re restarting treatment after a long break.
• You accidentally took more than your prescribed dose.
• You’re experiencing severe or persistent side effects.
• You have questions about changing your injection schedule.

Getting professional advice is the safest option whenever you’re uncertain about your treatment.

Frequently Asked Questions

I forgot my weight loss injection yesterday. What should I do?

If you’re still within the recommended missed-dose window for your medication, take the injection as soon as you remember. If you’ve passed that window, skip the missed dose and continue with your next scheduled injection.

Can I take my weekly injection a day late?

In many cases, yes. Whether you should take it depends on the medication you’re using and how many days have passed since your scheduled dose. Follow the guidance for your prescribed treatment.

Will I gain weight if I miss one injection?

Most people won’t regain weight because of one missed dose. You may notice increased hunger or food cravings, but returning to your normal dosing schedule and maintaining healthy lifestyle habits will help keep you on track.

Can I take two injections together?

No. Never take two injections to make up for a missed dose unless you’ve been specifically instructed to do so by your prescriber.

What happens if I’ve missed several weeks?

Contact your prescriber before restarting treatment. Depending on the length of the break, you may need to restart at a lower dose.

Key Takeaways

If you’ve missed your weekly weight loss injection, the most important thing is to stay calm and follow the guidance for your specific medication.

• Wegovy: Take the missed dose within five days. If more than five days have passed, skip it and continue with your normal schedule.
• Mounjaro: Take the missed dose within four days (96 hours). If more than four days have passed, skip it and take your next scheduled injection.
• Never take two injections together to make up for a missed dose.
• If you’ve missed multiple doses or you’re unsure how to restart treatment, seek advice from your prescriber or pharmacist.

Following your prescribed schedule as closely as possible will give you the best chance of achieving your long-term weight management goals.