When a patient is injected intramuscularly for the treatment of a certain disease and for intramuscular injection, if the intramuscularly injected drug is injected into the blood vessels, it may cause the following undesirable consequences: i. It may cause local vascular sclerosis and blockage, and local injection into the muscle is not recommended, which may lead to local vascular sclerosis and blockage. Second, it may lead to poorer results, and may even cause the drug to have no therapeutic effect, and may need to be re-injected intramuscularly. Third, if it is more serious, it may lead to allergy and even shock in patients. It must be noted that if it is clear that the drug cannot be injected into the blood vessels, it must be injected with attention to the injection method to avoid the drug entering the blood vessels and causing adverse consequences. If once injected into the blood vessels, immediately stop the injection, immediately let the patient lie down, pay attention to the observation, if no adverse reactions appear person, can be assured that the injection again, if the adverse reaction, should be timely symptomatic treatment.