Giving a shot at home follows a straightforward process: prepare your supplies, clean the skin, insert the needle at the correct angle for the injection type, push the plunger slowly, and dispose of the needle safely. The two most common types you’ll give yourself or someone else are subcutaneous injections (into the fat layer just under the skin) and intramuscular injections (deeper, into muscle tissue). Each requires a different needle, angle, and technique.
Subcutaneous vs. Intramuscular Injections
The type of injection determines almost everything about how you give it. Subcutaneous shots deliver medication into the fatty tissue between your skin and muscle. Insulin, blood thinners, and some biologic medications are given this way. You’ll use a short, thin needle (23 to 25 gauge, 5/8 inch long) and insert it at a 45-degree angle, or 90 degrees if you’re pinching up a fold of skin.
Intramuscular shots go deeper, directly into muscle, where blood flow is stronger and the body absorbs medication faster. Most vaccines, testosterone, and certain other medications are delivered this way. The needle is longer (typically 1 to 1.5 inches for adults) and inserted straight in at a 90-degree angle. Needle length depends on body size: adults under 152 pounds generally need a 1-inch needle, while men over 260 pounds or women over 200 pounds need a 1.5-inch needle to reliably reach the muscle.
Choosing the Right Injection Site
For subcutaneous injections, the most common site is the upper outer area of the arm (the back of the triceps region), though the abdomen and outer thigh also work well. Rotate your site each time to avoid irritation or tissue buildup in one spot.
For intramuscular injections, the deltoid muscle in your upper arm is the go-to site for most adults. To find it, locate the bony point at the top of your shoulder (the acromion process). The injection spot is roughly two inches below that bone, centered on the arm, and above the armpit fold. This is where most vaccines are given.
The outer thigh (vastus lateralis) is another reliable option, especially if you’re injecting yourself and can’t easily reach your own deltoid. Divide the front-outer part of your thigh into thirds from hip to knee, and inject into the middle third. A third site, the ventrogluteal muscle on the hip, is used for larger-volume injections. To find it, place your palm over the bony bump on the outer hip, point your index finger toward the belly button along the front hip bone, and spread your middle finger toward the top of the hip bone to form a V shape. The injection goes into the center of that V.
Gathering and Preparing Your Supplies
Before you start, set everything out on a clean surface: the medication vial or prefilled syringe, an alcohol swab, the correct syringe and needle, a sharps container, and a bandage. Wash your hands thoroughly with soap and water.
If your medication is refrigerated, take it out 20 to 30 minutes before the injection so it can reach room temperature. Cold medication stings more going in. Never microwave or heat medication to speed this up.
Drawing Medication From a Vial
If your medication comes in a vial rather than a prefilled syringe, you’ll need to draw it up yourself. Start by cleaning the rubber stopper on the vial with an alcohol swab. Then, with the cap still on the needle, pull back the plunger to fill the syringe with air equal to the dose you need. This step matters: injecting air into the vial first prevents a vacuum from forming inside, which would make it difficult to draw the liquid out.
Remove the needle cap, insert the needle through the rubber top, and push the air in. Then turn the vial upside down so the needle tip stays submerged in the liquid, and slowly pull back the plunger to your dose line. When reading the syringe markings, align with the top straight edge of the plunger, not the rounded dome.
If you see air bubbles in the syringe, keep the needle tip in the liquid and tap the barrel with your finger to float the bubbles to the top. Then gently push the plunger until the bubbles go back into the vial. If you have a lot of bubbles, push all the medication back in and start drawing again slowly. Air bubbles won’t harm you in a subcutaneous or intramuscular injection, but they do reduce the accuracy of your dose.
Cleaning the Skin
Wipe the injection site with an alcohol swab in a circular motion, working outward from the center. Let the skin air dry completely before inserting the needle. Injecting through wet alcohol can sting and may carry the antiseptic into the tissue.
Giving a Subcutaneous Injection
Pinch a fold of skin between your thumb and forefinger at the cleaned site. This lifts the fatty tissue away from the muscle underneath. Insert the needle at a 45-degree angle (or 90 degrees if there’s plenty of tissue to pinch). Push the plunger slowly and steadily until the syringe is empty. Release the skin fold, then withdraw the needle at the same angle you inserted it. Press a cotton ball or gauze lightly over the site.
Giving an Intramuscular Injection
Stretch the skin taut with your non-dominant hand. Insert the needle at a 90-degree angle in one smooth, firm motion, like throwing a dart. Push the plunger slowly to inject the medication.
You may have been taught to pull back on the plunger first to check for blood (a step called aspiration). Current CDC guidelines say this is no longer necessary for vaccines because no large blood vessels exist at the recommended injection sites, and the extra step can increase pain. For non-vaccine medications, follow whatever instructions your prescriber or pharmacist gave you.
After injecting, wait about ten seconds before pulling the needle out. This gives the medication time to begin dispersing and reduces leakage.
The Z-Track Method
Some intramuscular medications, particularly ones that stain or irritate tissue, call for a technique called Z-track. Before inserting the needle, use your finger to pull the skin about half an inch to one side of the injection spot. Hold it there while you insert the needle, inject the medication, and wait ten seconds. When you release the skin after withdrawing the needle, the layers shift back into their natural position, sealing the needle track like a zigzag. This prevents medication from leaking back up through the tissue.
Reducing Pain and Discomfort
A few simple adjustments make shots noticeably less painful. Applying an ice pack to the site for about 15 minutes beforehand numbs the skin. Relaxing the muscle helps too: if you’re injecting into the deltoid, let the arm hang loosely at your side rather than tensing it. Sitting down rather than standing can help you stay relaxed.
After the injection, gently massage or rub the site. This loosens the muscle and helps spread the medication, which can reduce soreness later. Distraction genuinely works as well. Talking to someone or listening to music shifts your attention enough to lower perceived pain.
Safe Needle Disposal
Never recap, bend, or toss a used needle into regular household trash. Drop it immediately into a sharps disposal container, which is a puncture-resistant plastic container with a locking lid. You can buy FDA-cleared sharps containers at most pharmacies, or use a heavy-duty plastic household container (like a laundry detergent bottle) if your community guidelines allow it. Keep the container out of reach of children and pets.
When the container is about three-quarters full, seal it and dispose of it according to your local rules. Options vary by location but typically include drop-off sites at pharmacies, hospitals, fire stations, or health departments. Some areas offer mail-back programs where you ship sealed containers to a disposal facility. Others provide special waste pickup from your home. You can find your local options by calling Safe Needle Disposal at 1-800-643-1643.