The question usually surfaces at the pharmacy counter or on the day of the first dose, and the honest answer is that it depends on which product is in the bag. Some GLP-1 devices arrive with the needle already inside, hidden and spring-loaded, with nothing to attach and nothing to see. Others are multi-dose pens built to take a fresh screw-on needle for every single injection, and one of those ships its needles in the carton alongside the pen. The difference is not a detail of style. It changes what you unwrap, what you throw away, and what has to be on hand before dose day.
This page cannot tell any individual which presentation they have, and it will not try. What it can do is lay out what each label actually says, so the carton in your refrigerator can be read against it. When in doubt, the pharmacist who dispensed it answers this question in thirty seconds.
The needle built in: nothing to attach
The Trulicity single-dose pen is the clearest case. The label describes it as a disposable, prefilled medicine delivery device where each pen contains exactly one dose and should only be used one time. The needle lives inside. The instructions describe a Base Cap that comes off before the injection, warn plainly "Do not touch the needle", and say not to put the Base Cap back on afterward because this could damage the needle. After the dose, the needle retracts automatically, which the instructions describe as happening in about 5 to 10 seconds. There is no separate needle to buy, attach, or store, because there is no separate needle at all.
Several Wegovy presentations work the same way. The How Supplied section of the label lists cartons containing 4 single-dose pens, or 4 single-dose syringes with integrated needles, or 1 single-patient-use pen, the FlexTouch, which is the multi-dose exception covered below. The single-dose pens and syringes are one dose, one integrated needle, one trip to the sharps container.
The hidden needle is not only a convenience, though it is that. For people who would rather not look at the thing doing the work, a device where the needle appears and vanishes on its own removes a real barrier, and the broader subject of injection fear and how people work around it is covered in Needle Anxiety and Weekly Shots: Practical Approaches.
Multi-dose pens: a new needle every single time
The other half of the class works on a different model: one pen, several doses, and a disposable needle that goes on fresh for each injection and comes straight off afterwards.
The Wegovy FlexTouch pen is a prefilled, single-patient-use, dial-a-dose pen, and the one many adults end up holding contains 4 doses of 2.4 mg. Its instructions state that NovoFine Plus 32G 4 mm disposable needles are included with the pen, that you should "always use a new needle for each injection", and that if more are needed, NovoFine Plus, NovoFine or other compatible disposable needles with a length up to 8 mm can be used, with needle compatibility to be discussed with a healthcare professional. The carton, in other words, arrives with the needles inside it.
Ozempic follows the same pattern. The How Supplied table lists each carton as one pen together with its needles, for example 1 pen with 6 NovoFine Plus needles, or 1 pen with 4 NovoFine Plus needles, depending on the strength. Each Ozempic multi-dose pen is for use by a single patient. The needles arrive with the pen, one per dose plus spares, and a new one goes on every time.
The daily liraglutide products say it even more directly. The Victoza and Saxenda labels instruct patients to "always use a new needle for each injection to prevent contamination", and then add a storage rule that surprises people: always remove and safely discard the needle after each injection and store the pen without an injection needle attached. Byetta says "do not reuse or share needles" and directs used needles into a puncture-resistant container. The Mounjaro and Zepbound KwikPens are multi-dose pens whose warnings likewise assume the pen needle is changed between uses, and for the vial presentations both labels say to always use a new syringe and needle for each injection.
A fresh needle every injection is the one instruction that is universal across every label that uses attachable needles. Reusing one is not a corner the labels offer to cut, and they do not frame it as a maybe.
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Even if the needle is changed
Every one of these labels carries a warning, each in its own words, that reads almost identically across the class. Ozempic: "Never share an OZEMPIC pen between patients, even if the needle is changed." Wegovy: "Never Share WEGOVY FlexTouch Between Patients, even if the needle is changed." Mounjaro and Zepbound: "Never share a KwikPen between patients, even if the pen needle is changed", and both labels give the reason outright: "because doing so carries a risk for transmission of blood-borne pathogens." Victoza, Saxenda and Byetta carry the same instruction in the same words.
That clause, even if the needle is changed, is the whole point, and it is worth slowing down for, because it is the loophole people reach for. Two household members, two prescriptions, one shared pen, each with their own fresh needle: the warning anticipates exactly this arrangement and rejects it. A new needle does not make a shared pen safe, because the risk is not only on the needle. Medication can flow backward into a pen during use, which is why the warning exists and why the single-patient language appears on every multi-dose device. One pen, one person, full stop.
Storage, coverage and where needles go
The storage rule deserves a second mention because it is specifically spelled out: two labels tell people not to store a multi-dose pen with a needle still attached. The reason the labels give is contamination, and it is the only reason this article will offer, because it is the only one the labels state. A needle left on between doses is a needle that did not go into the sharps container when it should have.
Where the needle goes afterwards is its own subject, containers, drop-off and what can legally go in the trash in which state, and it is covered in Sharps Disposal at Home: Simple and Legal. How much medicine is left in a multi-dose pen, and how to count doses instead of guessing, is covered in How Multi-Dose Pens Work, and Counting What Is Left. Where on the body the needle goes, and why the spot should move from dose to dose, is covered in GLP-1 Injection Site Rotation: Why It Matters and How to Track It.
Finally, the money question: whether pen needles arrive with the prescription or need a separate one, and whether a plan covers them, varies by product, pharmacy and plan. The FlexTouch and Ozempic cartons include needles, as above. Beyond that, this page says nothing about any plan, because plans differ, and the pharmacist is the thirty-second authority on what your arrangement covers.
Frequently asked questions
Do GLP-1 pens come with needles or do I buy them separately?
It depends on the product. Trulicity pens and Wegovy single-dose pens have the needle built in and hidden, with nothing to attach. The Wegovy FlexTouch pen and Ozempic pens are multi-dose and ship with disposable needles in the carton, NovoFine Plus for both, with one needle per dose plus spares. Whether a pharmacy dispenses extra needles, and whether a plan covers them, varies, and the pharmacist answers it in thirty seconds.
Can I reuse a pen needle to save money?
No. Every label that uses attachable needles says the same thing: always use a new needle for each injection. The Victoza and Saxenda labels state it explicitly to prevent contamination, and the Wegovy FlexTouch instructions repeat it. Reuse is not offered as an option anywhere in the prescribing information, so it is not a corner the labels permit cutting.
Is it safe to share a pen with someone if we each use our own needle?
No, and the labels close this exact loophole on purpose. Ozempic, Wegovy, Mounjaro, Zepbound, Victoza, Saxenda and Byetta all carry a warning never to share the pen between patients even if the needle is changed, and the tirzepatide labels give the reason outright: doing so carries a risk for transmission of blood-borne pathogens. A fresh needle does not make a shared pen safe, because the risk is not only on the needle.
Should I leave the needle on my pen between doses?
No. The Victoza, Saxenda and Byetta labels instruct patients to remove and safely discard the needle after each injection and to store the pen without an injection needle attached. The stated reason is contamination. On a multi-dose pen that still holds several doses, a needle left screwed on is also a needle waiting to be bumped, bent or forgotten, and the needle belongs in a sharps container after every dose regardless.
How do I know which kind of pen I have?
Read the carton and the Instructions for Use that came with it, because the product name alone does not settle it: Wegovy alone ships as single-dose pens, single-dose syringes with integrated needles, and a multi-dose FlexTouch pen. If the needle is hidden inside a base you push against the skin, nothing attaches. If there is a threaded tip, a new needle goes on every dose. A pharmacist answers it in thirty seconds.