Any strain high in the cannabinoid CBD or a Extract/Concentrate high in CBD. 10mg-100mg once or twice a day of CBD should be sufficient to help with dystonia and muscle spasms. Start with a joint of flower high in CBD, a vape pen high in CBD, or an edible with at least 10mg CBD to start to find a level that works for you. The highest level of concentration would be to dab CBD oil on a D-Nail electronic nail. Please feel free to call me for more details.
For answers to all of your cannabis related questions call me directly~ J-Dub