A safe intramuscular injection comes down to three things: sterile supplies used once, the right muscle, and a calm, slow technique. Most problems people run into, like abscesses and nerve pain, come from shortcuts.
- Use a fresh needle and syringe every time, and never share.
- The side of the hip (ventrogluteal), outer thigh and shoulder are the common sites.
- Return used sharps to a Canadian pharmacy in a sharps container.
Needles are the part most first-timers dread, and nerves are when mistakes happen. Practising each step until it feels routine is the best fix. The steps below follow standard nursing technique for intramuscular (IM) injections of oil-based medicines such as testosterone enanthate or cypionate.
What you need
- A sealed vial and the product page for it, so you can check strength (mg per ml)
- A sterile syringe, usually 3 ml. Our 25G 3 ml syringes suit MCT-based oils.
- Needles: many people draw with a wider needle (18–21G) and inject with a narrower one (22–25G), 25–38 mm (1–1.5 inches) long for most adults
- Alcohol swabs, a cotton ball or gauze, a bandage
- A sharps container
Step 1: Prepare
Wash your hands with soap for 20 seconds. Work on a clean, dry surface. Check the vial: the seal, the label, the lot number and the expiry date. The oil should be clear with nothing floating in it. If oil looks cloudy in a cold room, rolling the vial between your hands for a minute warms it and thins it. Never heat it in water or a microwave.
Step 2: Draw from the vial
- Wipe the rubber stopper with an alcohol swab and let it dry.
- Pull the plunger back to draw in air equal to the amount you will take out.
- Push the needle through the stopper and inject that air into the vial. This keeps the pressure even so the oil flows.
- Turn the vial upside down, keep the needle tip under the oil, and pull the plunger slowly to the dose you need. Oil is thick, so patience helps.
- Tap out any air bubbles and push them back into the vial, then withdraw.
- If you drew with a wider needle, swap to a fresh injection needle now. A needle that has gone through a stopper is slightly blunted.
Measure carefully. At 250 mg/ml, 0.4 ml is 100 mg. The measuring calculator on each injectable product page converts milligrams to millilitres for you.
Step 3: Choose and find the site
The three common sites for oil injections are:
- Ventrogluteal (side of the hip). Thick muscle with few nerves and vessels nearby, the site nursing guidance prefers for adults.
- Vastus lateralis (outer thigh). The easiest to reach and see yourself. Stay on the outer middle third.
- Deltoid (shoulder). Fine for small volumes of about 1 ml or less.
Each injectable product page has an injection-site section with a muscle map and short clinician videos showing how to find each spot. Avoid the upper-inner buttock and the inner thigh, where major nerves and blood vessels run.
Step 4: Inject
- Clean the skin with an alcohol swab and let it dry fully. Wet alcohol stings.
- Hold the skin flat or slightly stretched. Insert the needle at a 90-degree angle with one quick, steady motion.
- Many people pull back gently on the plunger for a few seconds (aspirating) to check no blood appears. Current nursing guidance says it is not essential at standard sites, but if blood appears, withdraw and start again with fresh supplies.
- Push the plunger slowly. A slow push over 20–30 seconds reduces soreness, especially with fast esters.
- Wait a few seconds, withdraw in one motion, and press lightly with gauze. Do not rub hard.
Step 5: Dispose of sharps safely
Put the needle and syringe straight into a sharps container. Never recap a used needle. In Canada, most pharmacies accept full sharps containers for free, and Ontario, BC and several other provinces run take-back programs. Our guide to safe disposal of used injection supplies covers each province.
Rotate sites
Using the same spot over and over causes lumps and scar tissue. Rotate between at least four spots: both hips and both thighs. Keep a simple log of date, site and side.
When to get help
If needles make you anxious, you are not alone. Our article on overcoming injection anxiety has practical tips.
Frequently asked questions
What needle size is used for testosterone?
Many people draw with an 18–21G needle and inject with a 22–25G needle that is 25–38 mm long, depending on body fat at the site. Thinner MCT-based oils pass easily through 25G.
Do I need to aspirate before injecting?
Current guidance says it is not essential at the standard IM sites, but many people still do it as a check. If you see blood, withdraw and start again with fresh supplies.
Where can I dispose of needles in Canada?
Most Canadian pharmacies accept sealed sharps containers free of charge, and many provinces run take-back programs.
Photo: rawpixel (public domain).
This guide describes standard injection technique for general information. It does not replace hands-on teaching from a nurse or pharmacist, who can show you in person.
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