The Wegovy pen is a prefilled, single-use injector that delivers a fixed dose of semaglutide under the skin once a week. There are no buttons to press, no dials to turn, and no visible needle. The entire injection is triggered by pressing the pen firmly against your skin and holding it there until a yellow bar in the pen window stops moving, which typically takes about 5 to 10 seconds.
What’s Inside the Pen
Each Wegovy pen comes preloaded with one exact dose of semaglutide, so there’s no measuring or mixing involved. The pen has a few key parts: a cap that protects it between uses, a pen window where you can check that the liquid inside is clear and colorless, and a needle cover on the bottom that hides the needle at all times. You never see or touch the needle directly. If you notice small air bubbles in the window, those are normal and won’t affect your dose.
How the Injection Works, Step by Step
After removing the pen cap, you place the bottom of the pen flat against your skin and press down firmly. That pressure pushes the hidden needle into the skin and triggers the injection automatically. You’ll hear a click when the process starts, and a yellow bar will begin moving across the pen window.
The key rule: keep pressing the pen against your skin until the yellow bar stops moving completely. That’s your confirmation that the full dose has been delivered. Once it stops, you pull the pen away. The needle cover locks automatically as soon as you lift it from your skin, so there’s no risk of an accidental stick afterward. The entire process takes only a few seconds of steady pressure.
If you pull the pen away too early or don’t press firmly enough, medication can leak onto your skin or squirt from the needle, meaning you may not get your full dose. Should that happen, don’t try to re-inject. Just make sure to hold the pen more firmly for the full duration next time.
What to Do If Something Goes Wrong
If you don’t hear the first click and the yellow bar doesn’t start moving, the most common fix is simply pressing the pen harder against your skin. The injection mechanism requires firm, consistent pressure to activate.
If the yellow bar starts moving but then stops partway through, or if it never starts moving at all despite firm pressure, the pen may be malfunctioning. In that case, contact your healthcare provider or call Novo Nordisk at 1-833-934-6891. Don’t attempt to reuse a pen that didn’t deliver properly.
Where to Inject
Wegovy can go into three areas: your lower stomach (at least two inches from your belly button), the front of your upper thigh, or your upper arm. Rotating between these sites from week to week helps reduce skin irritation and prevents hard lumps from forming under the skin at any one spot. You don’t need to use the same area each time, but pick a general region and vary the exact spot within it.
The Dose Escalation Schedule
Wegovy doesn’t start at full strength. The dose increases gradually over about four months to help your body adjust and reduce side effects like nausea. Each dose level comes in its own pen, so you’ll receive a new prescription strength roughly every four weeks:
- Weeks 1 through 4: 0.25 mg
- Weeks 5 through 8: 0.5 mg
- Weeks 9 through 12: 1 mg
- Weeks 13 through 16: 1.7 mg
- Week 17 onward: 2.4 mg (maintenance dose)
The pen itself works identically at every dose level. The only difference is the amount of medication preloaded inside. You use each pen exactly once, then dispose of it.
How to Store the Pen
Wegovy pens should be kept in the refrigerator at 36°F to 46°F (2°C to 8°C), ideally in their original carton to block light. If refrigeration isn’t available, a pen can stay at room temperature for up to 28 days, as long as the temperature stays at or below 86°F (30°C).
Throw the pen away if it has been frozen, exposed to temperatures above 86°F, left in direct light, or kept out of the fridge for longer than 28 days. Semaglutide is a protein-based medication, and extreme temperatures break it down in ways you can’t see by looking at the liquid.