Intravenous and intra muscular these both are most commonly used in hospital practice and for giving patient certain type of medications multivitamins and other things which directly explain entering into blood circulation.

so if I talk about intravenous this is basically most commonly used for giving patient of fluid and which is directly enter the way and this is used for the fastest absorption and potency is very high so when the patient is in shock or dehydration or certain other medical conditions.