A system for dispensing drugs, which is intended to dispense the drug to a patient in an oral manner, specially an infant or a child, without spilling and contaminating the drug by the direct introduction of a syringe into the bottle, where the system comprises a syringe for extracting the drug, an adapter tightly inserted into the container acting as a hermetic inner cap of the bottle for avoiding spillages and the contamination by being exposed to the environment, also being useful as a syringe guide and a housing for containing and keeping the syringe and adapter in a clean and hygienic manner, where the piston of the syringe comprises four corners orthogonally arranged equidistantly one from each other over the piston, where the front end portions or tips of said corners are coincident with the external diameter of the head of the piston, said front end portions avoiding the oscillation of the piston, so as to ensure the hermetic seal of the tip with regard to the smooth inner su rface at the moment of extracting the drug, therefore avoiding the vacuum loss, the head of the piston having a thickness with such a size that the outer edge of the head has a contact surface with an accuracy of thousandths of a millimetre for dispensing the drug and travelling through the inner surface of the syringe without loosing the tightness along the cylinder body, sliding without problems and without leaving residues in the interior of the syringe.Un sistema dispensador de medicamento para dispensar de manera oral medicamento a un paciente en particular un infante o niño, sin derramamiento ni contaminación del medicamento por la introducción directa de dicha jeringa dentro del frasco, en donde el sistema comprende en combinación una jeringa para extracción de medicamento, un adaptador ó invertido para ser insertado ajustadamente en el contenedor de medicamento y servir como un tapón interior hermético del mismo para evitar el derrame del medicamento y su contaminación por expos
