Medical malpractice insurance and pain.

In my home state there has been a lot of controversy about doctors that prescribe pain medications and then stop abruptly because of the high cost of malpractice insurance. This can often cause the patient to endure strokes, heart failure, seizures, among many other medicals problems. How should these doctors be dealt with?
They end up causing the patient more problems than they had prior to treatment in which they started.
I personally know people that have suffered from all these problems due to being cut off from medications that they had been taking for many years in most cases.
Is this infact a form of medical malpractice?