The intravenous injection produces the drug efficacy function is quickest, the dosage is big also has the irritant solution (for example calcium chloride, infiltrates glucose fluid high, infiltrates salt water and so on to be supposed high) the intravenous injection.

　　The intravenous injection spot, may choose the pate vein (in neck ditch, on pate 1/3 with the 1/3 intersection point, here vein in, easy to seek shallowly), below wrist above inside or wrist middle palm inside vein, or above articular joint of the tibia and talus flank, articular joint of the tibia and talus vein, stock inside vein and so on.When injection, with the rubber tube ligation injection spot vein centripetal end, makes the vein blood vessel anger to rise, after the partial shearing disinfection, parallel pricks the needle along the vein ordinate axis in the vein, if pricks the correct arriving, obviously arrives the blood backflow immediately.This time loosens grips the tight rubber tube, pricks again the needle along the blood lumen some, then the fixed needle, causes the solution to drip into (each minute 20-25 drop) slowly.After the injection finished, must use the ethyl alcohol lint ball to hold back the injection place, then draws out the needle, partial disinfection, in order to avoid blood along pinhole inflow hypodermic form haematoma.When intravenous injection must pay attention to following several points:

　　First, the injector must form a complete set, various parts engagement is strict, the injector and the needle must unimpeded not stop up, strict disinfection.

　　Second, must check the injection medicine earnestly the name, the use, the dosage and whether expired.When simultaneously injects two above medicines, whether there is should pay attention to the incompatibility.

　　Third, before the injection when drains away in the infusion rubber tube air bubble, the injection must prevent the solution leaks outside the blood vessel.In the injection process must pay attention to the heart the burden, prevented because of injects excessively quickly causes the struggle heart failure.

　　Fourth, has when the irritant medicine leaks hypodermic into, generally may to periphery organize to pour into the physiological saline or the distilled water, after in order to dilute is absorbed easily.When leaks off the medicine is the calcium chloride, may pour into the right amount 10% antiseptic sodium sulfate fluid, and in swelling partial hot compress, promotion dissipation absorption.