GLP-1 Pen Troubleshooting: What to Do After a Misfire, Leak, or Jammed Needle

Written by Dan Cripe, RN, BSN & Marcia Cripe, RN | Last Updated: September 13, 2026

You pressed the pen against your skin, heard a click, pulled it away—and now you're not sure what happened.

Maybe there is clear liquid running down your leg. Maybe the pen clicked but you never felt a needle. Maybe your Ozempic dose counter won't move normally. Maybe the needle bent. Or maybe the entire injection looked different from every other injection you've given yourself.

The most important rule is simple: if you aren't sure how much medication entered your body, don't automatically give yourself another full dose.

A pen problem creates uncertainty. A second injection can turn that uncertainty into an accidental extra dose.

Instead, identify which device you're using, look at the device's completion indicators, and determine whether you have evidence of a completed injection, an obvious failed injection, or an uncertain partial dose. If the amount delivered remains uncertain, the manufacturer, pharmacist, or prescriber should help determine what happens next.

First, Identify Which GLP-1 Device You Have

“GLP-1 pen” describes several very different delivery systems.

A Wegovy single-dose pen is an autoinjector with a hidden needle and visual injection indicator. A Zepbound single-dose pen uses its own activation and completion sequence. Ozempic is a multidose pen that requires a disposable needle and uses a dose counter. Zepbound is also available in other presentations, including a KwikPen and vials.

These devices do not troubleshoot the same way.

That means advice such as “wait for the second click” or “make sure the counter returns to zero” is only useful if it applies to the device in your hand.

Before trying to determine whether your injection failed, find the exact product name and presentation on the packaging. Then use the Instructions for Use for that device.

Wegovy Pen Clicked but Didn't Inject Medicine

With the current Wegovy single-dose autoinjector, hearing a click is only part of the injection process.

When the pen is pressed firmly against the skin, the first click indicates that the injection has started. A second click occurs while the injection is still in progress. The more useful visual indicator is the yellow bar in the pen window.

You should continue pressing the pen firmly against your skin until the yellow bar has stopped moving. Only then should you slowly lift the pen away.

This matters because hearing two clicks does not mean you should immediately remove the pen after the second one.

If you heard clicks but the yellow bar completed its movement and stopped, that supports that the injection sequence completed normally.

If the yellow bar never began moving, the current Wegovy Instructions for Use tell you to press the pen more firmly against your skin.

If the device still does not operate normally, don't repeatedly manipulate or attempt to repair the pen. Novo Nordisk specifically instructs users who think a Wegovy pen may be damaged not to try to fix it.

What If You Never Felt the Wegovy Needle?

Not feeling the needle does not mean the injection failed.

The Wegovy single-dose pen has a hidden needle, so you are not expected to watch it enter your skin. Subcutaneous injections can also be surprisingly difficult to feel.

Use the device indicators rather than pain as proof of injection.

If the pen activated appropriately, the yellow bar moved through its expected sequence and stopped, and there is no other evidence of a malfunction, the fact that you barely felt the injection does not establish that the medication wasn't delivered.

This is an important distinction because repeating a dose based solely on “I didn't feel anything” could expose you to more medication than intended.

Clear Liquid Running Down Your Leg After a Zepbound Shot

Seeing clear liquid after an injection is one of the situations most likely to make you want to inject again.

Don't make that decision based on the liquid alone.

First distinguish a tiny drop at the injection site from a substantial amount of medication visibly running down the skin. A small amount of surface moisture does not tell you how much medication entered your body, and a small spot of blood also does not mean the medication came back out.

With the Zepbound single-dose pen, the Instructions for Use provide device-specific indicators that help determine whether the injection completed. You should follow the exact activation and completion sequence for that pen rather than estimating delivery from how wet the skin looks afterward.

If a substantial amount of clear liquid visibly ran down your leg, the pen was removed prematurely, the device activated before it was positioned correctly, or the normal completion sequence did not occur, medication delivery may be uncertain.

The important word is uncertain.

You generally cannot look at the amount of liquid on your skin and calculate how many milligrams entered your body. Do not assume that “most of it leaked” and then attempt to replace the missing amount yourself.

Contact Lilly or your pharmacist for product-specific guidance.

A Droplet Is Different From an Obvious Misfire

Not every drop means the injection failed.

With several injection devices, a small drop of medication can remain around the needle or injection site after an otherwise completed injection. For example, the current Ozempic Instructions for Use specifically state that a drop may remain at the needle tip after injection and that this does not affect the dose.

An obvious misfire looks different. The medication may spray before the needle reaches your skin, the autoinjector may activate against the wrong surface, a mechanical indicator may fail to progress, or substantial medication may visibly escape during an interrupted injection.

Between those two situations is the frustrating category of the possible partial dose.

If you cannot determine whether the device completed normally and cannot determine how much medication entered, don't solve that uncertainty by guessing.

Ozempic Dial Stuck and Won't Turn

Ozempic uses a multidose pen, so troubleshooting is different from troubleshooting a single-dose autoinjector.

If the dose selector stops before reaching your prescribed dose, one possibility is simply that there isn't enough medication remaining in the pen for a complete dose. The Ozempic Instructions for Use explain how to use the dose counter to determine whether enough medication remains.

Do not try to force the dose selector past where it naturally stops.

If you're using a new Ozempic pen for the first time, the manufacturer also instructs you to perform a flow check before the first injection from that new pen. If a drop does not appear during the flow check, the instructions allow the flow check to be repeated up to six times. If there is still no drop, change the needle and repeat the flow check once more.

If a drop still does not appear, do not use that pen. The current Instructions for Use direct you to contact Novo Nordisk.

The flow check is for the first injection with each new Ozempic pen, not something you need to repeat before every weekly injection.

What If the Ozempic Counter Won't Return to Zero?

This is a particularly useful troubleshooting clue.

During an Ozempic injection, you press and hold the dose button while watching the dose counter. The complete dose has been administered when the counter reaches zero, and the instructions tell you to keep the needle in your skin while slowly counting to six after the counter reaches zero.

If the dose counter does not reach zero even though you continue pressing the dose button, the current Ozempic Instructions for Use identify a blocked or damaged needle as a possible cause.

In that situation, the manufacturer states that you have not received any Ozempic, even if the dose counter moved from the dose originally selected.

Follow the manufacturer's blocked-needle instructions rather than trying to force the pen. That includes changing the needle and restarting the preparation process with the new needle.

This is one of the unusual situations where the manufacturer's instructions give you much more certainty about whether medication was delivered. In many other apparent misfires, the amount delivered may remain unclear.

Bent Needle During a GLP-1 Injection: Did I Get the Dose?

A bent needle does not automatically tell you whether the dose entered.

What matters is when the needle bent and whether the device completed its normal delivery sequence.

If you notice that a disposable pen needle is bent before the injection, do not use it. Replace it with a new compatible needle according to your device instructions.

If you discover the bent needle after an injection, look at the device indicators. With an Ozempic pen, for example, whether the dose counter reached zero is important. If the counter failed to reach zero, the manufacturer's blocked-or-damaged-needle instructions apply.

If the needle bent during an injection and you cannot determine whether the medication was delivered completely, do not estimate the missing amount and inject additional medication on your own.

Contact the manufacturer or dispensing pharmacist.

The goal is not to prove that some medication entered. The clinically relevant question is whether you can establish that the prescribed dose was delivered.

What If the Needle Comes Off or Medication Sprays?

Stop and assess the situation rather than immediately attaching another needle and repeating the entire dose.

If medication sprayed before the injection began, that is different from a small drop remaining at the needle tip after a completed dose.

If a detachable needle became loose during administration, the amount delivered may be uncertain. The same applies if a pen needle was blocked, damaged, or disconnected before the dose counter completed its normal sequence.

Do not attempt to recover medication that has leaked onto the skin or another surface.

Do not draw leaked medication into a syringe.

Do not try to estimate how much medication was lost by looking at the wet spot.

And do not assume the remainder of a partially delivered dose can be calculated visually.

Once delivery becomes uncertain, manufacturer-specific troubleshooting is safer than improvisation.

Don't Try to Repair a GLP-1 Pen

A pen that appears mechanically damaged is not a home repair project.

Don't pry it open, attempt to reset internal components, insert objects into the device, or transfer medication from a malfunctioning branded pen into a syringe unless the manufacturer specifically instructs you to do so.

Novo Nordisk specifically tells Wegovy users who think a pen may be damaged not to try to fix it. Ozempic instructions likewise direct users through defined needle and flow-check troubleshooting rather than disassembly.

A damaged device also may need to be evaluated as part of a manufacturer product complaint.

Keeping it intact can therefore be useful.

Before You Throw Away a Misfired Pen

If you believe the pen malfunctioned, don't immediately discard everything unless doing so is necessary for safety.

The manufacturer may ask for information printed on the medication packaging or device when investigating the complaint. Lilly's product-support process, for example, tells patients that they may be asked for information from the product or medication package as well as details about the problem.

If you can do so safely, keep the pen, carton, or identifying information available until you've spoken with the manufacturer.

Do not leave an exposed needle unsecured while doing this. Used or exposed sharps still need to be handled safely, and you should follow the device-specific instructions for needle removal and sharps disposal.

It can also help to write down what happened immediately, while you still remember the sequence.

What Information Should You Record?

When you contact the manufacturer or pharmacist, useful information may include:

• the medication and strength;
• the type of device;
• the date and approximate time of the injection;
• where you injected;
• what the device did before, during, and after activation;
• whether you heard the expected clicks;
• whether the visual indicator or dose counter completed;
• whether medication leaked, sprayed, or remained on the skin;
• whether the needle appeared bent, blocked, loose, or damaged;
• identifying information from the pen or packaging when requested.

You do not need to diagnose the mechanical failure yourself. Your job is to describe exactly what happened.

Can You Get a Free Replacement Pen From Novo Nordisk or Eli Lilly?

Potentially, but don't assume every unsuccessful injection automatically qualifies for a free replacement.

Manufacturers distinguish between product problems and problems related to administration technique, and the company may need information about the device and circumstances before determining what assistance is appropriate.

For a suspected Novo Nordisk product problem, use Novo Nordisk's official product-complaint or customer-care process. The current Ozempic Instructions for Use specifically direct patients to contact Novo Nordisk when a new pen fails the manufacturer's flow-check troubleshooting. Current Wegovy instructions also provide a dedicated Wegovy support number for injection questions.

For a suspected Zepbound device problem, Lilly provides a formal product-support process for concerns involving product quality, usability, appearance, or safety. Lilly also provides telephone support for Zepbound through Lilly Support Services.

When you contact either company, describe the event as a possible device malfunction or product concern rather than simply asking for a free pen.

Let the manufacturer determine whether the incident qualifies for replacement or another resolution.

Novo Nordisk Product-Problem Contact

For Ozempic, the current Instructions for Use list:

1-888-693-6742

For Wegovy, the current Instructions for Use list:

1-833-WEGOVY-1

Novo Nordisk also maintains a U.S. product-complaint process and customer-care line.

Have your medication and packaging available when possible.

Eli Lilly Product-Problem Contact

For Zepbound product concerns, Lilly Support Services can be reached at:

1-800-LillyRx (1-800-545-5979)

Lilly also provides an online product-support process for U.S. patients reporting problems involving quality, usability, appearance, or safety.

Again, contacting the manufacturer does not guarantee replacement. It begins the process of evaluating what happened and determining what support is appropriate.

What If the Manufacturer Says the Pen Worked Normally?

That can happen.

Sometimes what looks like a malfunction is actually normal device behavior. A hidden needle may be almost impossible to feel. A small droplet may remain after a completed injection. An autoinjector may complete faster or feel different than you expected.

The manufacturer may walk through the device indicators with you and conclude that the dose was likely administered as intended.

If you still have a medical question about whether to take another dose, however, separate the device question from the dosing question.

The manufacturer can help troubleshoot its device. Your pharmacist or prescribing clinician may need to help determine what to do about your medication schedule when dose delivery remains uncertain.

Don't Use Hunger to Diagnose a Misfire

You gave the injection yesterday, but today you're hungry.

That does not prove the pen failed.

Appetite fluctuates. Early doses may produce little noticeable appetite suppression. Hunger can vary across the weekly dosing interval and in response to activity, sleep, food intake, hormones, stress, and many other factors.

The same applies if you didn't experience nausea.

Side effects are not proof of successful drug delivery.

Use objective device indicators whenever possible: the yellow bar, dose counter, completion sequence, needle condition, and the manufacturer's Instructions for Use.

Whether you “feel the medication” afterward is not a reliable troubleshooting tool.

When You Know the Injection Failed vs. When You're Not Sure

It helps to separate pen problems into three categories.

The device appears to have completed normally

The expected visual indicators completed, the device behaved according to its Instructions for Use, and there is no objective evidence of a significant malfunction.

A tiny drop or the absence of pain alone does not necessarily mean the dose failed.

The device clearly did not deliver normally

Medication sprayed before reaching the skin, the device failed its defined troubleshooting process, or the manufacturer's indicators establish that the dose was not delivered.

Follow the device-specific instructions and contact the manufacturer when directed.

The dose is uncertain

The pen was removed prematurely, substantial medication leaked, the needle bent during delivery, an indicator behaved abnormally, or something else happened that makes it impossible to determine how much entered.

This is the category where you should resist the urge to “make up” the dose.

Contact the manufacturer, pharmacist, or prescriber before administering additional medication.

A Simple GLP-1 Pen Misfire Protocol

When something goes wrong, use the same sequence every time:

1. Stop before giving yourself more medication. Don't automatically repeat the dose.
2. Identify the exact medication and device. Wegovy single-dose pens, Zepbound single-dose pens, Zepbound KwikPens, and Ozempic multidose pens use different mechanisms.
3. Check the completion indicator. Look at the yellow bar, dose counter, clicks, or other indicators specified for your device.
4. Look at what actually happened. A tiny drop, substantial leak, spray, blocked needle, bent needle, stuck dial, and failed indicator are different problems.
5. Follow the manufacturer's troubleshooting instructions. Do not substitute generic GLP-1 advice for your device's Instructions for Use.
6. Preserve the device information when safe to do so. A manufacturer investigating a product complaint may need details from the pen or packaging.
7. Contact the manufacturer when a device problem is suspected. They can troubleshoot the device and evaluate a product complaint.
8. Contact your pharmacist or prescriber when dose delivery remains uncertain. Do not estimate and replace the missing medication yourself.

This process may feel slower than simply grabbing another pen.

It is also much safer than turning one uncertain dose into two.

The Most Important Question Is Not “Did It Hurt?”

A successful GLP-1 injection can be almost painless. A tiny drop can remain after an otherwise normal injection. A click can mean something different depending on which pen you're holding.

That is why troubleshooting should be based on the mechanics of your actual device rather than what you expected the injection to feel like.

If the normal completion indicators occurred, that is useful evidence.

If they clearly did not, follow the manufacturer's troubleshooting instructions.

And if you genuinely cannot tell how much medication entered your body, accept the uncertainty instead of trying to solve it with another injection.

A questionable pen does not automatically require another dose.

Sometimes the safest next step is simply to stop, keep the device, and make a phone call.

Sources

1. Novo Nordisk. Wegovy (semaglutide) Prescribing Information and Instructions for Use. 2026.
   https://www.novo-pi.com/wegovy.pdf
2. Novo Nordisk. Ozempic (semaglutide) Prescribing Information and Instructions for Use. 2026.
   https://www.novo-pi.com/ozempic.pdf
3. Novo Nordisk. Contact Us: Adverse Event Reporting and Product Complaints.
   https://www.novonordisk-us.com/contact-us.html
4. Eli Lilly and Company. Zepbound (tirzepatide) Prescribing Information. 2026.
   https://pi.lilly.com/us/zepbound-uspi.pdf
5. Eli Lilly and Company. Zepbound Single-Dose Pen Instructions for Use.
   https://pi.lilly.com/us/zepbound-pen-us-ifu.pdf
6. Eli Lilly and Company. Zepbound: Dosing, How to Use & How to Inject.
   https://zepbound.lilly.com/weight/how-to-use
7. Eli Lilly and Company. Product Help & Support.
   https://www.lilly.com/producthelp/
8. Eli Lilly and Company. How to Report a Lilly Product Concern.
   https://www.lilly.com/medicines/report-product-concern