•Palpate the lower edge of the acromion process (肩峰突), which forms the base of a triangle. •Deltoid site is two fingerbreadths(3 to 5cm) below acromion process.•Place left hand on acromion process and right index finger two fingerbreadths below.•Inject limited medication volume in deltoid IM site at 90 degree angle. •Administer the injection using a Z Track technique