Complete Semaglutide Injection Guide: Step-by-Step Instructions

Important: Compounded semaglutide is not FDA-approved. This guide covers general injection technique only. It does not tell you how much to inject or how to calculate a dose. Your provider and pharmacy will give you your exact dose and the corresponding number of units (or mL) to draw, printed on your label. Never calculate or adjust your own dose. Use only the markings your clinician specifies, and call us if your label is unclear.

Quick Answer: Semaglutide is injected subcutaneously (under the skin) once weekly using either a pre-filled pen or a syringe with a vial. Common sites are the abdomen, thigh, or upper arm, rotating sites each week. Always follow the specific dose and instructions on your prescription label. Store medication as directed by your pharmacy (typically refrigerated at 36-46°F) and bring it to room temperature before injecting for more comfort.

Types of Semaglutide Delivery Systems

Semaglutide is supplied in a few different formats. These are not interchangeable. Branded pens (Wegovy, Ozempic) are FDA-approved and pre-dosed. Compounded semaglutide is not FDA-approved and is supplied differently; follow your specific instructions and label for whichever product you have been prescribed.

FDA-Approved Pre-Filled Pens (Branded)

Examples: Wegovy pen, Ozempic pen

These are FDA-approved products that come pre-dosed from the manufacturer. The dose is set with the pen’s built-in mechanism according to your prescription.

How they work:

• Pre-loaded with medication by the manufacturer
• A dose selector dial sets the amount as prescribed
• A needle attaches to the pen
• A push-button mechanism delivers the dose
• A dose counter shows remaining medication

Notes:

• No drawing up of medication required
• Convenient for travel
• Typically higher cost; coverage varies by plan
• Always follow the manufacturer’s instructions for use that come with your pen

Compounded Semaglutide (Not FDA-Approved)

Example: Compounded semaglutide dispensed by a compounding pharmacy

Compounded semaglutide is not FDA-approved. It is supplied differently from branded pens and is not equivalent to them. It is typically dispensed in a vial (used with a separate syringe) or, at some pharmacies, in a pre-filled syringe. Whatever format you receive, follow only the dose and instructions provided on your label by your provider and pharmacy.

How vials work:

• Medication is supplied in a glass vial
• You draw your prescribed dose into a syringe using the markings your clinician specifies on your label
• Typically used with insulin syringes

How pre-filled syringes work (if your pharmacy supplies them):

• Each syringe is prepared with your prescribed dose
• Ready to inject; no drawing required
• Some compounding pharmacies offer this format

Important: Do not assume any compounded product is the same strength, concentration, or dose as a branded pen. Never use a branded pen’s dosing instructions for a compounded product, or vice versa. Always use the label and instructions for the exact product you were dispensed.

For information about cost differences between these options, see our semaglutide cost guide.

Before You Inject: Preparation

Good preparation helps make injections more comfortable and supports proper sterile technique.

Supplies Checklist

Item	Purpose	Where to Get
Semaglutide (pen or vial)	The medication	Pharmacy, compounding pharmacy
Alcohol wipes	Clean injection site and vial stopper	Pharmacy, online, big box stores
Syringes (if using vials)	Administer the injection (use the type your clinician specifies)	Pharmacy
Sharps container	Safe needle disposal	Pharmacy, online
Gauze or cotton ball	Stop bleeding after injection	Pharmacy, online
Bandage (optional)	Cover injection site	Pharmacy, online

Pre-Injection Checklist

• ✓ Wash hands thoroughly with soap and water (20+ seconds)
• ✓ Gather all supplies in a clean, well-lit area
• ✓ Remove medication from the refrigerator about 30 minutes before injecting (room-temperature injection is more comfortable)
• ✓ Check medication for clarity (should be clear and colorless—do not use if cloudy or discolored)
• ✓ Check the expiration or beyond-use date
• ✓ Read your label and confirm your prescribed dose and the markings your clinician specified—do not calculate or change this yourself
• ✓ Choose and prepare your injection site
• ✓ Ensure a sharps container is nearby for immediate disposal

Choosing Your Injection Site

Semaglutide is injected subcutaneously, commonly in three body areas. Choose based on personal preference, comfort, and the guidance your provider gives you.

1. Abdomen (Most Common)

Injection area:

• At least 2 inches (5cm) away from the belly button
• Anywhere in the “soft” area of your lower abdomen
• Avoid the area directly around your navel
• Avoid areas with scars or skin changes

Advantages:

• Easiest to reach (no assistance needed)
• Good visibility
• Large area with subcutaneous fat for most people
• Easy to rotate sites

Disadvantages:

• May be uncomfortable if a waistband rubs the site
• Visible if wearing crop tops or swimwear immediately after

2. Thigh (Front or Outer)

Injection area:

• Front of thigh, middle third area
• Outer thigh (side)
• Avoid inner thigh (more sensitive, closer to blood vessels)
• Choose an area with adequate subcutaneous fat

Advantages:

• Easy to access while sitting
• Useful for people with less abdominal fat
• Large area for rotation
• Private (covered by clothing)

Disadvantages:

• May be less comfortable (more nerve endings)
• Tighter skin can make injection slightly more difficult
• Harder to pinch skin if very lean

3. Upper Arm (Back of Arm)

Injection area:

• Back of upper arm (triceps area)
• Between shoulder and elbow
• Outer back portion (not the inner arm)

Advantages:

• Discreet location
• Works well for people uncomfortable with abdomen/thigh

Disadvantages:

• Difficult to reach (may need assistance)
• Harder to see what you’re doing
• Limited area for rotation
• Requires more flexibility to self-inject

Areas to Avoid

• ❌ Within 2 inches of the belly button
• ❌ On or near moles, scars, bruises, or skin changes
• ❌ Areas of hard, thick, or tender skin
• ❌ Directly over bones
• ❌ A previous injection site (wait at least 1 week)
• ❌ Waistline where clothing rubs

Step-by-Step: Injecting with a Pen

These instructions describe general technique for FDA-approved branded pens such as Wegovy and Ozempic. Pens are pre-dosed by the manufacturer. Always follow the specific instructions for use that come with your pen and the dose your provider prescribed. Designs vary.

Step 1: Prepare the Pen

• Remove the pen from the refrigerator about 30 minutes before injection
• Remove the pen cap
• Check the medication in the viewing window (should be clear and colorless)
• Attach a new, sterile needle to the pen (twist until secure)
• Remove both needle caps (outer and inner)

Step 2: Prime the Pen (First Use Only)

• Follow your pen’s instructions for the flow check or priming step
• Point the needle upward and tap the pen gently to move air bubbles to the top
• Press the injection button as directed
• A drop of medication should appear at the needle tip
• If no drop appears, repeat priming as directed in your pen’s instructions
• Note: You typically only need to prime before the first injection with a new pen

Step 3: Set Your Dose

• Set the pen to the dose your provider prescribed, following your pen’s instructions
• Confirm the dose counter shows your prescribed amount
• Do not select a dose other than the one prescribed on your label. If anything is unclear, call us before injecting.

Step 4: Prepare the Injection Site

• Choose your injection area (abdomen, thigh, or arm)
• Clean the site with an alcohol wipe in a circular motion
• Let the site air dry completely (10-15 seconds—do not blow on it or fan it)

Step 5: Inject

• Pinch the skin gently between thumb and forefinger (creates a raised area)
• Insert the needle straight into the skin at a 90-degree angle (push firmly—the needle should go all the way in)
• Release your pinch
• Press the injection button fully until it stops
• Keep the button pressed and count to 6 slowly (helps ensure full dose delivery)
• Release the button and withdraw the needle straight out

Step 6: After Injection

• Do not rub the injection site
• If bleeding, apply gentle pressure with gauze or a cotton ball
• Never recap needles. Unscrew and discard the needle directly into your sharps container
• Replace the pen cap and store the pen as directed

Step-by-Step: Injecting with Vial and Syringe

These instructions describe general technique for drawing from a multi-dose vial. They do not tell you how much to draw. Your provider and pharmacy will give you your exact dose and the corresponding number of units (or mL) to draw, printed on your label. Never calculate or adjust your own dose. Use only the markings your clinician specifies, and call us if your label is unclear.

Step 1: Read Your Label

• Find your prescribed dose and the exact syringe marking (units or mL) to draw to, as written on your label by your provider and pharmacy
• Do not perform any dose math, and do not adjust the amount based on how you feel
• If the label is missing, smudged, or unclear in any way, stop and call us before injecting

Step 2: Prepare Supplies

• Wash hands thoroughly
• Gather your vial, a new sterile syringe, alcohol wipes, and a sharps container
• Remove the vial from the refrigerator (let it warm for about 15-30 minutes)
• Check the medication (should be clear, not cloudy)

Step 3: Draw Your Prescribed Dose

• Remove the cap from the vial (if first use)
• Clean the rubber stopper with an alcohol wipe and let it dry
• Remove a new, sterile syringe from its packaging
• Pull back the plunger to draw air equal to the amount your label specifies
• Insert the needle through the rubber stopper into the vial
• Push the plunger to inject air into the vial (makes drawing easier)
• Turn the vial upside down (the needle tip should be in the liquid)
• Pull the plunger to draw medication to the exact marking your clinician specified on your label
• Check for air bubbles—tap the syringe and push bubbles out if present, then confirm you are back at the exact marking on your label
• Remove the needle from the vial

Reminder: Use only the marking your clinician specified. Do not estimate, round, or change the amount. If you are unsure what marking to use, do not inject—call us.

Step 4: Prepare the Injection Site

• Choose your injection area (rotate from the previous week)
• Clean with an alcohol wipe in a circular motion
• Let it air dry completely (10-15 seconds)

Step 5: Inject

• Pinch the skin to create a raised area
• Insert the needle at a 90-degree angle quickly but smoothly
• Release the pinch
• Push the plunger slowly and steadily until all the medication is delivered
• Wait 2-3 seconds, then withdraw the needle straight out

Step 6: After Injection

• Do not rub the injection site
• Apply pressure with gauze if bleeding
• Never recap the needle. Immediately place the entire syringe into the sharps container
• Return the vial to the refrigerator
• Record the date and injection site in your log

Injection Site Rotation Strategy

Rotating injection sites helps prevent lipohypertrophy (lumps under the skin), supports more consistent absorption, and can reduce discomfort.

Rotation Methods

Method 1: The Quadrant System

1. Divide your abdomen into 4 quadrants (upper right, upper left, lower right, lower left)
2. Week 1: Inject in the upper right quadrant
3. Week 2: Inject in the upper left quadrant
4. Week 3: Inject in the lower right quadrant
5. Week 4: Inject in the lower left quadrant
6. Week 5: Return to upper right (should be fully healed)

Method 2: Body Area Rotation

1. Week 1: Right side of abdomen
2. Week 2: Left side of abdomen
3. Week 3: Right thigh
4. Week 4: Left thigh
5. Week 5: Return to right abdomen

Method 3: Clock System (Abdomen)

1. Imagine a clock face on your abdomen (belly button = center)
2. Week 1: Inject at the 12 o’clock position
3. Week 2: Inject at the 3 o’clock position
4. Week 3: Inject at the 6 o’clock position
5. Week 4: Inject at the 9 o’clock position
6. Week 5: Return to 12 o’clock

Tracking Your Sites

Keep a simple log to track rotation:

• Calendar with notes (“Left abdomen,” “Right thigh,” etc.)
• Phone note or app
• Printed body diagram where you mark each site
• Photo log (take a picture of the injection site immediately after)

Important: Wait at least 7 days before reusing the exact same spot. Using the same site too frequently increases the risk of lipohypertrophy and reduced absorption.

Proper Storage Requirements

Correct storage helps maintain medication quality. Always follow the storage instructions on your label, as compounded products may differ from branded pens.

Unopened Medication

Condition	Requirement
Temperature	36-46°F (2-8°C) in refrigerator
Location	Away from the freezer compartment (do not freeze)
Duration	Until the expiration or beyond-use date on the package/label
Light exposure	Keep in original carton to protect from light

Opened/In-Use Medication

Follow the in-use storage timeframe on your specific product’s instructions. As a general reference for branded pens:

Type	Storage	Duration (follow your product’s instructions)
Wegovy pen	Refrigerate (36-46°F) with pen cap on	Per the manufacturer’s instructions for use
Ozempic pen	Refrigerate or room temp per its label	Per the manufacturer’s instructions for use
Compounded vials	Refrigerate (36-46°F)	Per your pharmacy’s beyond-use date and instructions

Storage Guidelines

• ✓ Store as directed on your label between injections
• ✓ Remove from the fridge about 30 minutes before injection (more comfortable at room temp)
• ✓ Keep in original packaging until ready to use
• ✓ Store upright when possible
• ✓ Keep away from direct light
• ✓ Label the opened date on the vial/pen
• ✓ Check expiration/beyond-use dates before each use

Do NOT:

• ❌ Freeze medication (discard if frozen)
• ❌ Store in the freezer compartment or door (temperature fluctuates)
• ❌ Leave in direct sunlight or a hot car
• ❌ Use medication that has been frozen, even if thawed
• ❌ Use medication that is cloudy, discolored, or contains particles
• ❌ Store with a needle attached (increases contamination risk)

Travel Storage

• Use an insulated medication travel case with an ice pack
• Do not place directly on ice (can freeze)
• Carry in carry-on luggage (never checked baggage—cargo holds can freeze)
• Bring your original prescription label
• If refrigeration is unavailable temporarily, keep in the coolest location and follow your product’s guidance
• Return to proper storage as soon as possible

Safe Needle Disposal

Proper disposal protects you, your family, waste workers, and the environment.

Sharps Container (Best Option)

• Use an FDA-cleared sharps container ($10-15 at a pharmacy)
• Place needles in immediately after use. Never recap needles first
• Fill only to the fill line (typically 3/4 full)
• Seal the container when full
• Dispose per local regulations (pharmacy take-back, mail-back program, or household hazardous waste)

If You Don’t Have a Sharps Container Yet

If an official sharps container isn’t available, a sturdy alternative can be used temporarily:

• Heavy-duty laundry detergent bottle (thick plastic)
• Bleach bottle
• Metal coffee can with a plastic lid

Requirements:

• Made of heavy-duty plastic or metal
• Leak-resistant and puncture-resistant
• Has a tight-fitting lid
• Labeled clearly: “SHARPS - DO NOT RECYCLE”

Local Disposal Options

• Pharmacy take-back: Many pharmacies accept sealed sharps containers
• Mail-back programs: Purchase a mail-back kit, ship to a disposal facility
• Household hazardous waste: Check with local waste management for collection events
• Syringe exchange programs: Some communities offer free disposal

NEVER:

• ❌ Throw loose needles in the trash
• ❌ Put needles in recycling
• ❌ Flush needles down the toilet
• ❌ Recap needles (needle-stick risk)
• ❌ Use glass containers (can break)

Common Injection Mistakes to Avoid

1. Not Letting Alcohol Dry

Problem: Injecting through wet alcohol can cause stinging.

Solution: Wait 10-15 seconds after cleaning for complete evaporation.

2. Injecting Cold Medication

Problem: Cold medication can cause more discomfort and irritation at the site.

Solution: Remove from the fridge about 30 minutes before injection. Roll a vial gently between your palms to warm it.

3. Reusing Needles

Problem: Dulls the needle, increases pain, and raises infection risk.

Solution: Always use a fresh, sterile needle for each injection. Needles are inexpensive—don’t reuse.

4. Not Rotating Sites

Problem: Can cause lipohypertrophy (hard lumps), poor absorption, and increased pain.

Solution: Use a rotation strategy and track sites systematically.

5. Injecting Through Clothing

Problem: Introduces bacteria, dulls the needle, and prevents proper site preparation.

Solution: Always expose the skin completely. Fully remove or pull up clothing.

6. Not Counting the Full Hold Time

Problem: Withdrawing the needle too quickly can cause leakage.

Solution: Count to 6 slowly with pen injections, or 2-3 with syringes, before withdrawing.

7. Injecting at the Wrong Angle

Problem: A shallow angle can go too superficial; too deep can reach muscle.

Solution: A 90-degree angle works for most people. Use a 45-degree angle only if your provider instructs you to.

8. Forgetting to Prime the Pen

Problem: Air in the needle and an inaccurate delivery.

Solution: Prime before the first use of each new pen, following your pen’s instructions. Check for a medication drop at the needle tip.

9. Changing Your Own Dose

Problem: Calculating, rounding, or adjusting your dose can lead to a dosing error.

Solution: Use only the dose and syringe marking your provider and pharmacy printed on your label. Never self-calculate or self-titrate. If your label is unclear, call us before injecting.

Troubleshooting Injection Problems

Problem: Medication Leaks After Injection

Possible causes: Withdrawing the needle too quickly, not counting the hold time, or hitting a small blood vessel.

Solutions:

• Count to 6 slowly before removing the needle (pens) or 2-3 seconds (syringes)
• Withdraw the needle straight out, don’t angle it
• Apply gentle pressure (don’t rub) if medication appears at the surface
• Small leakage (less than 1 drop) is usually minor. Do not re-inject or add a dose. Call us if you have questions

Problem: Injection Is Painful

Possible causes: Cold medication, wet alcohol, a reused needle, or hitting a nerve.

Solutions:

• Warm the medication to room temperature
• Ensure the alcohol is completely dry
• Use a fresh needle every time
• Try a different injection site
• Relax your muscles (tension increases pain)
• Insert the needle quickly and smoothly (slower = more pain)

Problem: Blood After Injection

Cause: A small capillary was nicked (common and usually harmless).

Solutions:

• Apply gentle pressure with clean gauze
• Don’t rub (can increase bruising)
• Apply a bandage if desired
• Minor bruising is common—rotate sites next time

Problem: Can’t Draw Medication from the Vial

Possible causes: Vacuum in the vial, needle not in the liquid, or an empty vial.

Solutions:

• Inject air into the vial before drawing
• Keep the vial upside down with the needle tip submerged in the liquid
• Check the vial volume—you may need a new vial (contact your pharmacy)
• Ensure the needle isn’t clogged

Problem: Pen Won’t Inject

Possible causes: Blocked needle, dose not set correctly, or pen malfunction.

Solutions:

• Remove and replace the needle with a fresh one
• Check that the dose selector is at your prescribed amount
• Ensure the pen isn’t empty (check the dose counter/window)
• Prime the pen again if needed, following its instructions
• If the pen still doesn’t work, contact your pharmacy or call us

Reducing Injection Pain and Discomfort

Many people report semaglutide injections cause little or only minor discomfort. These strategies may help minimize any pain:

Before Injection:

• Use room-temperature medication (about 30 minutes out of the fridge)
• Choose areas with more subcutaneous fat
• Relax your muscles completely
• Take a deep breath and exhale slowly during the injection
• Consider using ice for 30 seconds before the injection (numbs the area slightly)

During Injection:

• Insert the needle quickly and smoothly (fast insertion = less pain)
• Push the plunger slowly and steadily (fast injection = more stinging)
• Don’t tense your muscles
• Look away if you’re needle-anxious (reduces anticipatory tension)

After Injection:

• Don’t rub the injection site (can increase irritation)
• Apply gentle pressure if needed
• Rotate sites consistently to reduce sensitization

Needle Selection (If Using Syringes):

• Use the needle type and length your clinician recommends
• Use a thin gauge for comfort, as advised by your provider
• Never reuse needles (dulls the tip significantly)

Getting Started with Semaglutide

Learning proper injection technique is an important part of treatment. With the right support and clear instructions, the process can become routine.

At Contour Health, we provide:

• Injection guidance: Education on proper technique from licensed providers
• Clear labeling: Your exact prescribed dose and instructions on your label—so you never have to calculate a dose yourself
• Supplies: The supplies needed for your prescribed format
• Ongoing support: A team available to answer questions about your injections

Compounded semaglutide is not FDA-approved. Individual results vary, and treatment is appropriate only when prescribed by a licensed provider after evaluation.

Learn more about our compounded semaglutide program and get support from licensed providers.

For a broader overview of semaglutide beyond injection technique, see our complete guide to semaglutide.

Frequently Asked Questions

Does the semaglutide injection hurt?

Many people report semaglutide injections cause little or only minor discomfort, often compared to a mosquito bite. The needles are very thin, and injecting into fatty tissue has fewer nerve endings than muscle. Discomfort is often related to technique (cold medication, wet alcohol, muscle tension) rather than the injection itself. Experiences vary from person to person.

Where is the best place to inject semaglutide?

The abdomen (at least 2 inches from your belly button) is the most common and often most comfortable site. It’s easy to reach, has good subcutaneous fat for most people, and offers a large area for rotation. The front/outer thigh and back of the upper arm are also commonly used—choose based on personal comfort, your provider’s guidance, and your ability to rotate sites effectively.

How do I know how much semaglutide to inject?

Your provider and pharmacy will give you your exact dose and the corresponding number of units (or mL) to draw, printed on your prescription label. Never calculate or adjust your own dose, and never self-titrate. Use only the markings your clinician specifies. If your label is unclear, smudged, or missing, do not inject—call us first.

Can I inject semaglutide in the same spot every week?

No. Rotate injection sites and wait at least 7 days before reusing the exact same spot. Injecting repeatedly in the same location can cause lipohypertrophy (hard lumps of fatty tissue), poorer absorption, increased pain, and skin changes. Use a rotation strategy (quadrant system, body-area rotation, or clock method) and track your sites.

What happens if I inject semaglutide into muscle instead of fat?

Injecting into muscle (intramuscular vs. subcutaneous) is more likely to cause pain and may change how the medication is absorbed. To help stay in fatty tissue, pinch the skin before injecting, inject at a 90-degree angle, and use the needle length your provider recommends. If you’re very lean, ask your provider about proper technique.

How long does semaglutide stay good once opened?

Follow your specific product’s instructions. Branded pens have in-use timeframes listed in their manufacturer instructions for use. Compounded semaglutide vials have a beyond-use date set by your pharmacy. Always check your label, mark the “opened date” on your medication, and discard after the recommended timeframe even if medication remains. Using a product past its beyond-use date may reduce its quality.

Can I reuse semaglutide needles?

No, never reuse needles. Reusing needles can dull the tip (making injections more painful), increase infection risk, and risk contamination or needle breakage. Needles are inexpensive, so reuse is not worth the risks. Always use a fresh, sterile needle for each injection.

What if I see air bubbles in my syringe or pen?

Small air bubbles are generally harmless but can affect the amount delivered. For syringes: tap the syringe to bring bubbles to the top, push the plunger to expel them, then confirm you are back at the exact marking your clinician specified on your label—do not draw to a different amount. For pens: prime per your pen’s instructions (hold it upright, tap gently, and press the button until a drop appears). If you’re unsure, call us before injecting.

Can I inject semaglutide through clothing?

No, never inject through clothing. Injecting through fabric can introduce bacteria, prevent proper skin preparation, dull the needle, make it hard to see the site, and catch fabric in the injection. Always fully expose the skin, clean with alcohol, and inject directly into bare skin.

Should I rub the injection site after injecting semaglutide?

No, do not rub the injection site. Rubbing can increase local irritation, may affect absorption, and can increase bruising. If you see a drop of medication at the surface, apply gentle pressure (don’t rub) with clean gauze. It’s fine to apply a bandage if desired, but don’t massage the area.

Can I travel with semaglutide injections?

Yes, with proper precautions: carry it in your carry-on luggage (checked-baggage cargo holds can freeze medication), use an insulated travel case with an ice pack (don’t place directly on ice), bring your original prescription label, pack a sharps container, and research sharps disposal at your destination. Semaglutide and supplies are generally allowed through TSA security—notify officers you’re carrying medication and sharps.

What should I do if medication leaks out after injection?

If you see a small amount of medication at the site after removing the needle, a drop or less is common and usually minor. This often happens when the needle wasn’t held in long enough (count to 6 with pens, 2-3 with syringes) or a small blood vessel was nicked. To reduce leakage, hold the needle in place longer before withdrawing, withdraw straight out, and apply gentle pressure (don’t rub). Do not re-inject or add a dose to “make up” for minor leakage. If you have questions, call us.