How Long Does a Wegovy Pen Last? UK Guide

If you've just started Wegovy, you may have a very practical question.

How long does a Wegovy pen last?

You open the box and see one pen.

Then you start wondering.

Is that one injection?

One week?

Or does the same pen cover several weeks?

For the standard Wegovy FlexTouch pen used in the UK, the answer is quite simple. One pen contains four doses and is normally used once a week for four weeks.

But there are a few important details to understand.

Especially when it comes to storage, dose changes and the newer 7.2 mg dosing option.

How long does a Wegovy pen last?

A standard Wegovy FlexTouch pen contains four doses of your prescribed strength.

Because Wegovy is normally taken once a week, one pen provides approximately four weeks of treatment.

So, for example:

Week 1: Dose 1
Week 2: Dose 2
Week 3: Dose 3
Week 4: Dose 4

After you've used all four doses, the pen should be disposed of.

There may still appear to be some liquid left inside.

That's normal.

The remaining amount isn't enough to provide another complete dose, so you should not try to extract it or use it as an extra injection.

How many doses are in a Wegovy pen?

A standard Wegovy FlexTouch pen contains four doses.

This applies to the standard UK FlexTouch strengths of:

• 0.25 mg

• 0.5 mg

• 1 mg

• 1.7 mg

• 2.4 mg

Each pen contains the prescribed dose for four weekly injections.

The important thing is to check the label.

Different pens contain different strengths.

Don't assume that every Wegovy pen contains the same amount of semaglutide.

Does one Wegovy pen last exactly 28 days?

For the standard once-weekly FlexTouch pen, four doses means it is used across four weekly injections.

That works out to roughly four weeks.

However, there is another point people sometimes miss.

The in-use shelf life is six weeks when stored according to the product instructions.

That doesn't mean you should stretch one pen over six weekly doses.

It doesn't.

The pen contains four prescribed doses.

Once those four doses have been administered, the pen should be discarded even if some solution appears to remain.

The six-week period refers to how long the pen can be kept after first use under the specified storage conditions, not how many doses you can get from it.

That's an important difference.

Can you get a fifth dose from a Wegovy pen?

No.

You shouldn't try to use leftover liquid as a fifth dose.

After four correct injections, there may still be some solution visible inside the pen. The manufacturer information explains that this remaining solution is insufficient for another dose.

Trying to force out extra medication isn't a good idea.

You may not receive the correct amount.

And with prescription medication, guessing the dose isn't worth it.

Use a new pen when required.

How long does a Wegovy pen last at each dose?

The standard FlexTouch pen is designed to provide four doses of the prescribed strength.

So the usual pattern looks like this:

The dosing schedule can change depending on your treatment plan, so always use the strength prescribed for you.

How long does Wegovy last in the fridge?

Before first use, Wegovy should generally be stored in a refrigerator at 2°C to 8°C, away from the cooling element. It should not be frozen. (Medicines.org.uk)

That applies to an unused pen.

Once you've started using the pen, the storage rules are slightly different.

A used pen can be stored below 30°C or, preferably, in a refrigerator at 2°C to 8°C, according to the product information. Its in-use shelf life is six weeks.

Keep the pen cap on when it isn't being used.

And keep it away from the cooling element.

What happens if you leave Wegovy out of the fridge?

Don't automatically assume the pen is ruined.

The exact circumstances matter.

The current UK product information allows an in-use Wegovy pen to be stored below 30°C or in the refrigerator.

However, excessive heat can be a problem.

If your pen has been exposed to high temperatures, direct sunlight or uncertain storage conditions, check the product instructions or speak with a pharmacist before using it.

And one rule is especially important.

Never use Wegovy if it has been frozen. 

Can you use Wegovy after six weeks?

The six-week in-use shelf life matters.

Once a pen has been used, the product information states that it can be kept for up to six weeks under the specified storage conditions.

But remember.

You aren't supposed to take six doses from the pen.

It still contains four doses.

The six-week period is about the usable storage period after first use.

If you've had a pen for longer than the allowed in-use period, don't continue using it simply because there appears to be medicine left.

Ask a pharmacist if you're uncertain.

What if there is liquid left after the fourth dose?

This can look confusing.

You've taken four injections.

You look at the pen.

There's still liquid inside.

So you think, “Surely there's another dose there?”

Not necessarily.

The pen is designed to deliver four doses. Any remaining solution after those four doses is insufficient for a complete dose and the pen should be discarded.

Don't try to calculate the remaining amount yourself.

Don't dial the pen beyond its intended dose.

And don't use a syringe to remove leftover medication.

The pen is designed for the prescribed doses.

That's it.

Does changing your Wegovy dose change how long the pen lasts?

It can change which pen you use, but each standard FlexTouch pen still contains four doses of its specified strength.

Wegovy treatment is normally increased gradually.

The standard adult schedule begins with 0.25 mg weekly and increases over time toward the maintenance dose, depending on the treatment plan and tolerability.

So you may use:

• A 0.25 mg pen during the starting stage

• A 0.5 mg pen during the next stage

• A 1 mg pen later

• A 1.7 mg pen after that

• A 2.4 mg pen as a maintenance dose

Your prescriber may adjust this schedule when necessary.

Don't change your dose just to make a pen last longer.

What about the 7.2 mg Wegovy dose?

This is where things get slightly more complicated.

For adults with obesity, the UK product information now includes a possible 7.2 mg once-weekly dose after at least four weeks on 2.4 mg, when appropriate.

The 7.2 mg dose involves three injections of 2.4 mg on the same scheduled day.

That means you may need three 2.4 mg injections to make up the full weekly 7.2 mg dose. The UK patient guide explains that three packs of 2.4 mg FlexTouch pens provide a four-week supply for this dosing option.

So don't confuse the standard four-dose pen with the 7.2 mg treatment.

The dosing instructions are different.

Can you make a Wegovy pen last longer?

You shouldn't deliberately extend a pen beyond its intended dosing schedule.

Wegovy is prescribed at a specific dose and frequency.

Trying to use smaller amounts or extract leftover medication can result in an inaccurate dose.

If you want to change your treatment schedule because of side effects, cost or availability, speak with your healthcare professional.

There may be a safe solution.

But it shouldn't involve guessing.

How do you know when a Wegovy pen is empty?

The FlexTouch pen has a dose counter and dose selector to help you use the prescribed dose.

The official instructions recommend keeping track of how many injections you've taken and how many doses remain.

After four doses, the pen should be discarded.

Even if there appears to be a little liquid remaining, don't assume it contains another full dose.

That's one of those situations where “there's still some left” doesn't mean “there's another injection.”

What if you forget how many doses you've taken?

Don't guess.

Check your records or the dose tracking information that came with your pen.

If you still aren't sure, speak with your pharmacist or healthcare professional before taking another injection.

Taking an extra dose because you can't remember whether you've already injected could result in receiving too much medicine.

A simple weekly reminder can help prevent this.

How should you dispose of a used Wegovy pen?

After you've used all four doses, dispose of the pen according to local requirements.

Needles should be disposed of safely after each injection.

Do not leave used needles attached to the pen.

The product information advises removing and safely disposing of the needle after each injection and storing the pen without a needle attached.

Your pharmacist can tell you how to dispose of used pens and needles in your area.

FAQs

How long does a Wegovy pen last?

A standard UK Wegovy FlexTouch pen contains four weekly doses, so one pen normally provides about four weeks of treatment.

How many injections are in one Wegovy pen?

A standard Wegovy FlexTouch pen contains four doses. Each dose is intended to be used once weekly.

Can I get five doses from one Wegovy pen?

No. A FlexTouch pen is designed to provide four doses. Any remaining liquid after the fourth dose is insufficient for another complete dose and the pen should be discarded.

How long can an opened Wegovy pen be kept?

The UK product information states that an opened pen can be kept for up to six weeks when stored according to the specified conditions.

Does an unopened Wegovy pen expire?

Yes. An unopened pen has an expiry date shown on the pen and carton. It should be stored correctly and not used after the expiry date.

Can I keep a used Wegovy pen in the fridge?

Yes. After first use, Wegovy can be stored in a refrigerator at 2°C to 8°C, away from the cooling element, or below 30°C according to the product information.

What if there is still Wegovy left after four injections?

Don't use the leftover solution as an additional dose. The remaining amount is insufficient for a complete dose and the pen should be disposed of after the four prescribed doses.

Final thoughts

So, how long does a Wegovy pen last?

For the standard UK Wegovy FlexTouch pen, it's straightforward.

One pen. Four doses. One dose each week. Roughly four weeks of treatment.

The pen may still appear to contain some liquid after the fourth injection. That's normal. Don't try to squeeze out another dose.

Store it correctly. Keep it away from freezing temperatures. Use a new needle for every injection and dispose of the pen when its prescribed doses have been used.

And if you're ever unsure about how long your particular pen has been stored or whether it has been kept at the right temperature, ask a pharmacist before using it.

A little checking now can prevent a much bigger problem later.