One Ozempic® pen holds either four or six weekly doses, depending on which of the three pen strengths you have and the dose you're taking. Once you've used it for the first time, that same pen is only good for 56 days. Whichever runs out first, the doses or the days, ends the pen's life.
The short answer
A red pen delivers 0.25 mg or 0.5 mg doses. If you're starting treatment, it holds 6 doses (four 0.25 mg doses, then two 0.5 mg doses). If you're on a maintenance 0.5 mg dose, it holds four 0.5 mg doses. A blue pen holds four 1 mg doses, and a yellow pen holds four 2 mg doses. Once you take your first dose from any of them, throw the pen away 56 days later, whether it's been kept at room temperature or in the refrigerator, even if medicine remains.
How many doses are in each Ozempic® pen?
Ozempic® comes in three multidose pens. Each holds 3 mL of liquid at a different strength concentration.
| Pen (label color) | Delivers | Doses per pen |
|---|---|---|
| Red | 0.25 mg or 0.5 mg | 6 when starting (four 0.25 mg + two 0.5 mg) or 4 doses of 0.5 mg |
| Blue (Teal) | 1 mg | 4 |
| Yellow (Gold) | 2 mg | 4 |
The red pen is the outlier. It holds enough medicine for six doses when you're starting treatment (four weeks at 0.25 mg, then two weeks at 0.5 mg), or four doses if you're taking 0.5 mg every week. According to Ozempic®'s labeling, you'll take 0.5 mg for at least four weeks before any further dose increase, and 0.5 mg can be a long-term (maintenance) dose for many people — so a second red pen after the first is common. If your dose goes up to 1 mg or 2 mg, you'll switch to the blue or yellow pen, which each hold four weekly doses.
Before every injection, check the name and colored label on your pen to make sure it's the right one. This matters most during a dose change, when you may have two strengths in the fridge.
What actually determines how long a pen lasts
Two separate clocks apply to an opened pen, and whichever finishes first ends the pen's life:
- The dose count. A blue or yellow pen is done after its fourth dose; the red pen is done after its sixth dose if you started at 0.25 mg, or its fourth if you're taking 0.5 mg every week.
- The 56-day window. Once you take a pen's first dose, it must be discarded 56 days later regardless of how much medicine is left inside. During those 56 days, an in-use Ozempic® pen can be kept at room temperature (59–86°F) or in the refrigerator (36–46°F). Either works, and moving it between the two doesn't reset or extend the 56 days.
For a pen used on its normal weekly schedule, the dose count almost always runs out first: four weekly doses span three weeks between the first and last injection, and six span five weeks — both comfortably inside the 56-day window. The calendar rule mainly matters if a pen sits partly used for a while, such as when treatment is paused or several doses are missed (message your prescriber for guidance).
One rule applies before you've opened the pen at all: an unused, unopened Ozempic® pen has no manufacturer-stated room-temperature grace period. It's meant to stay refrigerated at 36–46°F until first use. For the full before-first-use rules, heat exposure, and travel guidance, see does Ozempic need to be refrigerated.
So how long does a typical prescription actually last?
On a standard weekly schedule:
- One red pen covers 6 weeks of doses when you're starting treatment (four weeks at 0.25 mg, then two at 0.5 mg), or 4 weeks if you're taking 0.5 mg every week.
- One blue or yellow pen covers 4 weeks of doses at a steady maintenance dose of 1 mg or 2 mg.
That means a month's supply after titration is usually just one pen, not four — a common point of confusion for patients used to counting daily-pill months. Your pharmacy label and prescription will state exactly how many pens you're sent and how often; if the math doesn't match what you expect, ask your pharmacist before assuming anything.
Can I make a pen last longer by taking a smaller dose?
No. The Ozempic® pen is engineered to deliver only its marked doses — there's no supported way to give yourself a partial dose, and doing so isn't a way to "stretch" a pen or extend a prescription. Unofficial "click chart" guides that claim you can count dial clicks to measure a smaller dose are not something the pen is designed or FDA-reviewed to do accurately, and an improvised dose can be meaningfully off in either direction. If cost, side effects, or anything else has you wanting a lower dose, that's a conversation for your prescriber — a dose change is a prescription decision, not something to approximate at home. The same goes for sharing: never share your Ozempic® pen with anyone, even if you change the needle. Sharing pens can spread infections.
What if a pen runs out of doses before 56 days is up?
That's normal and expected — discard it once you've taken its final dose (the fourth or sixth, depending on the strength of the pen and your dose), even if it's well within the 56-day window. The dose count, not the calendar, is usually what ends a pen's life when you're dosing on schedule.
If the dose counter stops before your full dose, don't use the medicine left in that pen; start a new pen. Before the first injection with each new pen, do the flow check described in the instructions. Use a new needle for every injection.
What if my pen still has medicine left after 56 days?
Discard it anyway. The 56-day window is a hard stop set by the manufacturer's stability data, not an estimate of how much liquid is left — a pen can look like it has doses remaining and still be past its usable window. Write the first-use date on the pen or carton as soon as you start it, so you're never guessing.
When to call your provider or pharmacist
Reach out if you're not sure when a pen was first used, if you've missed enough doses that your remaining pen count and refill timing don't line up, or if a pen has been exposed to temperatures above 86°F and you're unsure whether it's still usable. Don't use a pen that's been frozen, even after it thaws.
Need the full injection routine? See our step-by-step guide to using the Ozempic® pen, our Ozempic® storage and travel guide, or learn more about GLP-1 treatment at Pallas.
Bottom line: A red Ozempic® pen holds 6 doses when starting treatment, or 4 at a steady 0.5 mg dose; blue and yellow pens hold 4 each. Never try to stretch a pen with a smaller-than-prescribed dose, always write down the first-use date the moment you open a new pen, and discard it at 56 days no matter what's left inside.
