Semaglutide Injection Sites Guide

Medical Disclaimer

This website is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting, changing, or stopping any medication or supplement. Dosage information reflects published FDA-approved labeling or publicly available clinical trial data — individual treatment decisions must be made by a licensed physician.

About semaglutide

Proper injection technique and site rotation are essential for semaglutide therapy. This guide covers the three approved injection sites, how to rotate them, and best practices for comfortable, effective injections.

Indication

Injection technique guidance for semaglutide (Ozempic / Wegovy) subcutaneous self-injection.

Dose Calculator

Enter your prescribed dose and vial concentration to calculate how many units to draw.

mg ↔ Units Dose Calculator

Convert between milligrams and insulin-syringe units for compounded GLP-1 medications. Uses a standard U-100 syringe (100 units = 1 mL).

Medication

Vial Concentration (mg/mL)

Dose (mg)

Units (U-100 syringe)100 units

Volume1.000 mL

2.5 mg at 2.5 mg/mL → 1.000 mL → 100 units on a U-100 (100-unit / 1 mL) insulin syringe

Always verify calculations with your prescribing provider or pharmacist before administering any medication. This calculator is for reference only.

Injection Sites

Abdomen

Subcutaneous fat of the abdomen, at least 2 inches from the navel. The most commonly preferred site.

Inject in the fatty area around (but not in) the belly button
Stay 2 inches away from the navel in all directions
Lift a skin fold with thumb and forefinger if needed
Rotate within a zone: e.g., upper-left, lower-left, upper-right, lower-right, cycling weekly
Avoid scar tissue, stretch marks, and bruised areas

Thigh

Front or outer thigh, mid-way between hip and knee.

Use the middle, outer front area of the thigh
Avoid the inner thigh (too close to vessels and nerves)
Pinch the skin before injecting if thigh fat is minimal
Alternate left and right thighs each week
Good for patients who find the abdomen uncomfortable

Upper arm

Outer, posterior aspect of the upper arm (triceps region).

Usually requires a partner or caregiver for injection
Use only the back of the arm — avoid the deltoid muscle
Difficult to self-inject correctly; use abdomen or thigh if injecting alone

Storage Instructions

Store pen in refrigerator until first use
After first use: up to 56 days at room temperature or refrigerator
Never expose to heat above 77°F or freeze
Keep the pen cap on when not in use

Common Side Effects

Contact your healthcare provider if side effects are severe or persistent.

Injection site redness or itching (common, usually brief)
Small bumps or induration (rotate sites to prevent)
Bruising (use smaller gauge needle, inject slowly)

Frequently Asked Questions

Where is the best place to inject semaglutide?

The abdomen is most commonly recommended because it's easy to self-inject and has good subcutaneous fat. All three approved sites (abdomen, thigh, upper arm) are equally effective — choose what's most comfortable for you and rotate consistently.

How far should I inject the needle?

Semaglutide is a subcutaneous (under the skin) injection, not intramuscular. Most auto-injection pens handle depth automatically. If using a syringe, inject at a 45° angle if skin folds are thin, or 90° if skin folds are adequate.

Can I inject semaglutide in my arm by myself?

It's possible but difficult. Most people find it easier to use the abdomen or thigh for self-injection. If the upper arm is your preferred site, consider having a partner or caregiver administer the injection.

What happens if I inject in the same spot every week?

Injecting repeatedly in the same spot can cause lipodystrophy — lumpy, hardened fatty tissue. This can impair drug absorption and cause aesthetic changes. Consistent site rotation (covering at least 3–4 different spots) prevents this.