Yes, however, be aware of cross addiction - becoming addicted to those medications that ease withdrawal symptoms. These medications are more safely administered through inpatient detox/rehab. Discuss the options with your doctor and communicate your intentions clearly.
Yes, of course. If you are suffering from drug withdrawal symptoms, depending on the severity, you should be under the supervision of a doctor. There are drugs that ease the process but in some cases it would be counter productive to treat drug withdrawal with different drugs.
The person who can best answer this question is a medical doctor or pharmacist. I believe there are drugs such as methadone and suboxone but they may only be used for heroine addiction. If you are suffering from extreme withdrawal symptoms please seek out medical attention.
If you are experiencing withdrawl symptoms it is not wise to look to other medications as there could be potential withdrawl symptoms with these as well. If you are looking for a good way to help with these symptoms, try different vitamins or supplements such as Vit- C, Vit - B12/B6, and melatonin for sleep if you are having trouble with that. Grocery stores usually have a good supply of different vitamins and supplements.
As always when talking about prescription drugs, I would recommend consulting your doctor. They deal with these sort of things and not only would provide you options with prescriptions, but they'd also be equipped with many other resources to accompany your needs. Especially since many health-related factors come into play when dealing with prescription, no one would be more qualified to answer your question than them. :)
Some of them can be to help ease the symptoms of withdrawal, it depends what the prescription is for. If you have any specific question consult your doctor about new medication, and types that can help with withdrawal.