An agent delivery apparatus for administering a pharmacological agent formulation to a sub-mucosal compartment of a body organ, comprising injector means having an internal formulation chamber that is adapted to receive and contain the pharmacological agent formulation therein and an elongated agent delivery member having a first end that is in communication with the internal formulation chamber and a second ejection end, the injector means including force generating means that is adapted to generate sufficient force to expel the pharmacological agent formulation from the injector means and into and through the agent delivery member, and out of the ejection end of the elongated agent delivery member. In one embodiment of the invention, the delivery member comprises a needleless delivery member.
