Summarize this article:

When administering an IM injection, the penetrative action of the needle creates a narrow channel, or track, within the tissues. It may be possible for the medication to leak out of the body through this track. Applying the Z-track technique reduces skin irritation and allows for effective absorption by sealing the medication in the muscle tissue. Firmly hold to keep the skin and subcutaneous tissue in place. Pull back on the plunger slightly to check for blood return, then slowly push to inject the medication. This allows the medication to evenly disperse into the tissue. A zigzag path is created that closes off the track left by the needle and keeps the medication inside the muscle tissue. As a result, patients should experience less discomfort and lesions at the injection site. Do not massage the site as this can cause the medication to leak, as well as irritation.
Understand the advantages of the Z-track method. Repeat the steps of hand-washing, filling the syringe, and choosing and cleaning the injection site. Pull the skin taut 1 inch (2.5cm) laterally to the side with your non-dominant hand. Insert the needle at a 90 angle into the muscle layer with your dominant hand. Keep the needle in place for 10 seconds. Withdraw the needle in a swift motion and release the skin.