Why? A medical degree is mostly a marathon of hard work and dedication. Laudable. I couldn't do it.
But does it take wits? The medical researcher probably. The person who figures out the dosage, maybe. But the person who through rote learning knows of the top of their heads the proper dose? Meh.
The people on this forum probably average 130 IQ. Not everyone here could do a medical degree. But most are probably smarter than their doctors.