How to Inject GLP-1 Medication: Sites, Rotation and Safe Disposal

Where to inject

Both brand-name labels describe subcutaneous injection, which means into the fat layer just under the skin. The Wegovy label says to inject in the abdomen, thigh or upper arm, and warns not to inject into a muscle or a vein. The Zepbound label says to inject in the abdomen or thigh, or in the back of the upper arm when another person gives the injection.

The Wegovy Instructions for Use adds practical detail for choosing a spot:

• Use the front of the thigh, the lower stomach (keep 2 inches away from your belly button) or the upper arm.
• Do not inject where the skin is tender, bruised, red or hard, and avoid scars and stretch marks.
• Your healthcare provider can help you choose the site that is best for you.
• Clean the site with an alcohol swab or soap and water, do not touch it afterward, and let the skin dry before injecting.

The Wegovy label says to inject once weekly on the same day each week, and that the time of day and the injection site can be changed without the need for a dosage modification. Ask your provider before shifting your dosing day.

Rotating injection sites

Both labels say to rotate injection sites with each dose. The Wegovy Instructions for Use explains that you may inject in the same body area each week, as long as it is not the same spot every time. The MedlinePlus entry for semaglutide injection gives the same instruction: use a different site for each injection.

A simple habit is to write down the area you used. The Gala GLP-1 app lets you log each dose, and you can add a note about where you injected so you do not repeat the same spot back to back.

Pen vs vial and syringe

The way you prepare a dose depends on the product you were given, so use the instructions that came with it.

• Pens: The Wegovy pen has the dose already set. The Instructions for Use describe pulling off the cap, pressing the pen firmly against the skin, and holding it there until the yellow bar in the pen window stops moving. The label says the injection takes about 5 to 10 seconds, and that taking the pen off the skin too early can mean you do not get your full dose.
• Vials and syringes: The Zepbound label says patients who use vials should use a syringe appropriate for the dose (for example, a 1 mL syringe that can measure a 0.5 mL or 0.6 mL dose) and always use a new syringe and needle for each injection.
• Never share: The Zepbound label states that a KwikPen must never be shared between patients, even if the needle is changed. MedlinePlus likewise says never to reuse or share needles or pens.
• Check the liquid: The Zepbound label says the solution should appear clear and colorless to slightly yellow, and not to use it if particles or discoloration are seen. The Wegovy Instructions for Use says not to use the pen if the medicine is not clear and colorless, if the pen looks broken or used, or if the expiration date has passed.

Both labels also say to read the Instructions for Use and to be trained by your healthcare provider before injecting. The Wegovy instructions say not to use the pen without training, and the Zepbound label says a patient may self-inject after training if the provider decides it can be done properly.

Compounded vials: follow your pharmacy and provider

Compounded medications are not FDA-approved. Compounded semaglutide and tirzepatide often come as a vial that you draw into a syringe, and the label instructions for brand-name pens do not describe your product. Follow the directions from your provider and the dispensing pharmacy for your exact medicine, concentration and syringe.

Some compounded vials give the dose in units on a syringe, and how much medicine each unit holds depends on the vial's concentration. Ask your provider or pharmacy for the dose in milligrams and milliliters, and for a syringe size that matches it.

• Ask for your dose in writing, in the same unit as your syringe markings.
• Confirm the syringe size and what each marking means before your first injection.
• If the number on your instructions does not match the number on your syringe, stop and message your provider or pharmacy before injecting.

For background on how these products differ from brand-name drugs, see our guide to compounded GLP-1 medications.

Storing your medicine

Storage rules come from each product's label. Check the carton and Instructions for Use for the exact product you have.

Both labels also say not to freeze the medicine and not to use it if it has been frozen, and to protect it from heat and light by keeping it in the original carton. Keep all medicines and sharps out of the reach of children. Compounded products have their own storage rules on the pharmacy label, so follow those.

Disposing of needles and pens

The FDA's guidance on sharps says used needles and syringes should be placed in a sharps disposal container immediately. It describes a good container as made of puncture-resistant plastic with leak-resistant sides and bottom and a tight-fitting, puncture-resistant lid. If you do not have an FDA-cleared container, the FDA says a heavy-duty plastic household container, such as a laundry detergent container, can be used. The FDA also lists insulin and other injector pens as sharps.

• Put the used pen or needle in the sharps container right after the injection.
• Never put loose sharps in household or public trash or recycling bins, and never flush them down the toilet.
• Do not reuse a pen, and do not recycle the pen or the sharps container.
• When the container is nearly full, follow your community's rules. State and local laws vary, and the FDA sharps page links to state-specific information.

What not to do

• Do not inject into a muscle or vein. Both labels describe subcutaneous use.
• Do not reuse or share needles, syringes or pens.
• Do not use medicine that is frozen, discolored, cloudy or contains particles.
• Do not guess a compounded dose. Measure only what your pharmacy and provider told you, and ask if the units are unclear.
• Do not double up after a missed dose. For brand-name products, follow the missed-dose instructions on the label, and for compounded products follow your provider's directions.
• Do not change your dose on your own. Message your care team if you are unsure.

Injection site reactions, such as redness or itching, are listed in the Zepbound label. Contact your provider if a site becomes very painful, swollen or looks infected, and see our GLP-1 side effects guide for symptoms that need urgent care.

How Gala's care team helps

Gala offers compounded semaglutide, compounded tirzepatide and brand-name Ozempic®. A licensed provider reviews your online assessment and prescribes only if it is appropriate for you. If prescribed, your medication ships to your home, you can message your care team with questions about your dose or technique, and your provider can adjust your dose.

To see whether a GLP-1 option may be right for you, start your online GLP-1 assessment, or explore the weight loss hub. For how doses step up over time, see our GLP-1 dosing schedule guide.

This article is for information only and is not medical advice. Talk to your healthcare provider or pharmacist about how to inject your specific medicine.

Sources

1. Novo Nordisk. WEGOVY (semaglutide) prescribing information, Medication Guide and Instructions for Use. FDA-approved label.
2. Eli Lilly. ZEPBOUND (tirzepatide) prescribing information. FDA-approved label.
3. MedlinePlus (NIH). Semaglutide injection.
4. U.S. FDA. Safely Using Sharps (Needles and Syringes) at Home, at Work and on Travel.

This article is for general information and is not medical advice. Talk to a licensed provider about your own health.