Theophylline is a drug that was first used for treating asthma. It is a methylxanthine, which is a category that includes substances found in coffee, chocolate, and tea like caffeine and theobromine. However theophylline is much stronger than these substances. Research has shown that theophylline applied intranasally can help improve sense of smell for individuals with olfactory impairment. There has been renewed interest in this medication as many patients who…