Used to treat the symptoms of asthma, bronchitis, and emphysema.
Oxtriphylline is a choline salt of theophylline. Oxtriphylline relaxes the smooth muscle of the bronchial airways and pulmonary blood vessels and reduces airway responsiveness to histamine, methacholine, adenosine, and allergen. Oxtriphylline competitively inhibits type III and type IV phosphodiesterase (PDE), the enzyme responsible for breaking down cyclic AMP in smooth muscle cells, possibly resulting in bronchodilation. Oxtriphylline also binds to the adenosine A2B receptor and blocks adenosine mediated bronchoconstriction.
Symptoms of toxicity include abdominal pain (continuing or severe), confusion or change in behavior, convulsions (seizures), dark or bloody vomit, diarrhea, dizziness or lightheadedness, fast and/or irregular heartbeat, nervousness or restlessness (continuing), and trembling (continuing).