Why isn't the syringe syringe medicinal shot injected directly into the artery but within a fickle spot within our arm?

everytime i go to the doctor and go and get shots(vaccines or vitamin B shots for example) in my arm, it hurts plentifully.why isn't the needle injected surrounded by our vein close to an IV, so it's less painless and the prescription is effective quicker?
doctors/nurse:please explain.Why isn't the syringe syringe medicinal shot injected directly into the artery but within a fickle spot within our arm?
Injections are usually given into muscle or excess weight so that the drug will disperse slowly into the blood stream. If it was injected into a capillary the undiluted drug would go straight to the heart and is imagined to cause central problems.
Medications like that cannot be injected directly into the artery because then you would receive too big a dose, too quickly. When injected into the muscle, the medication can slowly engender its way into your system.
You are getting "IM" injections - intramuscular. The medication has to be injected into the muscle to be significant in the instances you describe. Some shots are "IV" - surrounded by the vein, some "IM", and some are "SC" which scheme subcutaneous (under the skin) such as insulin shots. Sorry.
There is nothing impulsive about it. The shots you are getting are designed to be injected into the muscle. Some medications are hazardous if injected intravenously (such as local anesthetics), and some are simply less forceful.
Drugs can be injected into muscle, veins (very on the odd occasion, arteries), under the skin or into the skin. Some, close to some chemotherapy agents, have to be injected into big middle veins within the chest. We also can inject drugs into the fluid around the spinal cord, or into the epidural space which surrounds the spinal cord.
Some drugs, like morphine, can move about pretty much anywhere. Most others are specifically formulated to be administered in a hard to please way.

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