It is available in many forms at better Chinese pharmacies everywhere. This formula really assumes a Liver problem. It wouldn't be appropriate for tremors due to internal fire. This formula may need to be supplemented with herbs that take into consideration your unique causative factors as well. A practitioner of Chinese herbalism can help you find the right formula.
Acupuncture is also very good at calming the tremors in specific parts of the body.
Again, the acupuncture is excellent for the symptoms and the herbs excel at addressing the internal disharmonies that are the causative factors. Some acupuncturists do not incorporate herbs in their practice and feel quite competent in treating this problem without the herbs. So, if your acupuncturist says that the acupuncture will treat your epilepsy just fine, decide for yourself if you believe them in your heart. They may be right. As usual, the proof of the pudding is in the eating.