No_intervention: Control

The injection is administered using the standard method.

Experimental: Helfer Skin Tap Tecnique

After identifying the injection site, the muscles are relaxed by gently tapping the skin with the fingertips of the dominant hand for about five seconds. Using the thumb and index finger of the non-dominant hand, a V shape is formed, and the entire hand is used to tap the skin three times. Simultaneously with the third tap, the needle is inserted into the muscle at a 90-degree angle. After aspiration, the medication is injected over 5 seconds while continuing to gently tap the skin with the fingertips of the non-dominant hand. After administering the medication, the needle is withdrawn from the muscle simultaneously with final tap, while tapping the skin in a V shape using the non-dominant hand.

Experimental: Local Cold Application

A cold gel compress is removed from the freezer and left at room temperature for a few minutes to thaw slightly. After identifying the injection site, the cold gel compress is wrapped in gauze and placed on the deltoid area to cover the injection site. The cold gel compress is held in place for one minute. After one minute, the cold gel compress is removed. The skin is cleaned with an alcohol swab, then the injection is administered.