Is botox helpful for dystonia

I don't think so.

According to Britannica Concise Encyclopedia, "Botox blocks the release of the neurotransmitter acetylcholine, interfering with the ability of the muscle to contract".

The dystonia, as far as I know, messes up the ordinary muscle tone of someone. But ceasing the natural capacity of your muscle to contract for the sake of extinguishing any abnormal effects in your organism is not a good decision. In fact, decisions directly concerning your health should be taken solely by your doctor.

In any case, consider visiting specialized websites about surgeries and medical procedures on the internet. I have a good suggestion for your research: http://www.surgery.com

Kind regards.