:wave: I'm not on theophylline now, but I've used it before. There are several different side effects for theophylline, which is chemically related to caffiene. I would do a search on your search engine. My experience with it was horrible. My levels were close to toxic with it, no asthma relief, vomited so much that I lost weight and had the shakes so bad I could rip a paper if I held it just right. Horrible medication for me. Hopefully you don't have these problems.