I started taking Primidone 50mg a little over a week ago for essential tremors. I ve developed a small rash on my face that started the day after taking it and now it has gotten a little worse and bigger with each passing day. It s slightly itchy, inflamed and very red almost looking like a sunburn. I thought it was my rosacea acting up, but I don t think so. This looks different. I ve applied cortisone 1% which has provided some relief, but I wonder if I should stop taking this med all together. I can t get in touch with my doctor until Monday and have read that I shouldn t suddenly stop taking this med. I m not sure what to do and going to an ER will cost hundreds if not over a thousand dollars.