A medication injection site is provided that includes a medication port and an identification sensor. The medication injection site, when coupled to a medication container, can wirelessly transmit data characterizing the contents of the medication container to a remote data collection system. The housing of the medication injection site has a shape and size enabling it to be held by a first hand of a user while the user administers medication from the medication container via the medication port using his or her second hand. The housing can include a disposable sub-housing and a reusable sub-housing such that the reusable sub-housing is used by many patients. In some implementations, the medication injection site can be placed on an IV drip line. Related apparatus, systems, and kits are also disclosed.