We should not consume medicines given by a doctor who does not know about the name, shape and correct usage of medicines.
One might escape from Lord Indra's weapon, but one cannot survive after consuming medicines from a idiot doctor.
In other words the illness may become worse and may even lead to death.
A doctor with half knowledge
A doctor who is self proclaimed and gives medicine without proper knowledge to an ill patient who trusts him.
That doctor commits sin, he is a criminal who kills people. A person who even talks to such a doctor goes to hell.
Medical profession for money
A doctor should drink snake's poison or hot iron instead of asking for money from a patient. In other words a doctor must not take money from patient even for saving his own life.
This is the reason that a person who wants to become a doctor must make arrangements of his basic needs. He should be able to accumulate medicines and herbs so that he serve the society and save people's life.
We must use only that medicine which benefits in an ailment. Similarly we must come in contact to a doctor who is able to cure the disease.
The above statement makes it clear that doctor's profession is not for making money but to serve the society.
In ancient times doctors did not work for money but to help people. Today, big multinational companies and doctors ask for money even in emergencies or they would even let the patient die.
Medical treatment and doctors are considered as divine profession. A doctor must not become a doctor because he wants to make money. But because he wants to serve the society.]