Theophylline
Cas No. [58-55-9]
DRUG INTERACTIONS: Certain groups of patients
metabolize theophylline slowly, and can develop elevated blood
levels and potential toxicity even on usual doses. These patients
include those with liver disease, older men with chronic lung
diseases, infants, patients with high fever or heart failure, and
patients taking other medications that increase blood theophylline
levels. Examples of medications that can elevate theophylline blood
levels include ephedrine, allopurinol (Zyloprim), cimetidine (Tagamet),
ciprofloxacin (Cipro), erythromycin, oral contraceptives, and
propranolol (Inderal). Theophylline toxicity can cause nausea,
vomiting, insomnia, seizures, agitation and life- threatening heart
rhythm abnormalities. Theophylline should be used cautiously in
patients with high blood pressure, peptic ulcer disease, seizure
disorders, and serious heart disease, especially with heart rhythm
problems.
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