This is an extremely controversial topic and there are thoughts on both sides. Let me give you some considerations.
First, there is a huge moral / religious dimension. Many people do not believe it is in our power to take a life, even out own. Who knows what will happen to the person? Perhaps the person will get well or later on change their mind (with suicide there is not second chance). Moreover, what if the person is not thinking correctly, because that person is sick?
Second, there are legal ramifications. As it stand, it is not legal to help someone commit suicide (as a physician). There is good reason for this. There are many variables in death, such as inheritance issues, which may complicate issues.
Third, the above two points are against physician assisted suicide, but on the other side, there is thought of the will and the suffering of the person in view. Perhaps, it is most loving to let people go without suffering.
In the end, I do not believe that there should be physician assisted suicides mainly due to religious reason.