Why are vaccines and injections given mostly on the left arm?

In India under universal immunization programme ,BCG and japnese encephalitis(JE) is given on left hand.while hepititis B and pentavalent vaccine is given on left thigh.Injectable polio vaccine(IPV)and measles is given on right arm. read more

Toto is correct. Most people are right handed, therefore, the injection is usually given in the left deltoid muscle (upper arm). Vaccines can cause localized muscle pain and it just makes sense not to cause unnecessary pain in an arm that a person needs to use frequently. read more

Subcutaneous (SC) injections For infants younger than 12 months of age, the usual site for SC administration of vaccine is the subcutaneous tissue of the anterolateral thigh; if necessary, the upper triceps area of the arm may be used. SC injections for vaccine recipients 12 months of age and older are usually given into the subcutaneous tissue of the upper triceps area of the arm. read more