noun. a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator.
Example sentences of the word theophylline
1. Noun, singular or mass
If your dog is taking aspirin or the airway dilator theophylline, Lasix may increase the concentration of these drugs in the blood, so your veterinarian will need to adjust the dosage.
2. Verb, base form
Caffeine is closely related to theophylline, a prescription drug used to improve breathing, and caffeine itself has been experimentally used to control some types of asthma.