Question

Why does the doctor inject medicines in the veins but not in arteries?

Answer 1

arteries are deep seated..doctor cant find arteries so quickly except a few..viens are superficial..but in most cases arteries from wrist are used for injections because maximum of the medicines those are injected are all soluble in oxygenated blood

Answer 2

Answer:

Veins are more easily accessible, many being superficial, no high pressure so no risk of the blood backing up into the infusion fluid which would defeat its purpose, and after removing the needle no need to press firmly for 5 minutes to prevent a hemorrhage from taking place.

Under special circumstances however we do inject substances into an artery, taking all precautions needed to e.g. prevent blood spill or bleeding afterwards, e.g. injecting blood vessel dilatory drugs like Methyldopa in conditions where arteries spasm causing lack of blood mostly in hand/feet fingers/toes in Raynaud's disease, in inoperable tumors sometimes blood clots or other solids are injected into the artery that feeds the tumor, thus causing the tumor to (partially) die off because of the lack of blood feeding it so slow the growth and make it more sensitive to chemotherapy and radiation treatment see Catheter Embolization, and then in rare cases chemotherapy is administered into the artery feeding the tumor which might be in the pancreas, liver, brain, eye.

Explanation: