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  • Acute
  • Acute viral infections can increase your theophylline blood level. (netdoctor.co.uk)
  • Theophylline is given systemically (orally as slow-release preparations for chronic treatment and intravenously for acute exacerbations of asthma) and blood concentrations are determined mainly by hepatic metabolism, which may be increased or decreased in several diseases and by concomitant drug therapy. (mdpi.com)
  • bronchodilator
  • Theophylline is a type of medicine called a xanthine bronchodilator. (netdoctor.co.uk)
  • While the mechanisms of action of theophylline are not known with certainty, studies in animals suggest that bronchodilatation is mediated by the inhibition of two isozymes of phosphodiesterase (PDE III and, to a lesser extent, PDE IV) while non-bronchodilator prophylactic actions are probably mediated through one or more different molecular mechanisms, that do not involve inhibition of PDE III or antagonism of adenosine receptors. (nih.gov)
  • Theophylline is an antiasthmatic and bronchodilator that is marketed under 50 brand names in both the United States and Canada. (fsu.edu)
  • nausea
  • You should stop taking theophylline and seek medical attention if you experience potential signs and symptoms of excessive drug levels such as nausea, vomiting, persistent headache, insomnia, and rapid heartbeat. (drugs.com)
  • therapeutic
  • Cardiovascular system: Theophylline stimulates beta1-receptors and can cause atrial tachydysrhythmias such as sinus and supraventricular tachycardia, even at therapeutic levels. (medscape.com)
  • lungs
  • Theophylline works by inhibiting the enzyme phosphodiesterase thus producing an increase in intracellular cyclic AMP, causing a relaxation of muscles in the bronchial tubes and blood vessels of the lungs. (fsu.edu)
  • Theophylline works to clear passages to your pets' lungs and keep them healthy. (petcarerx.com)
  • Theophylline acts by relaxing muscles in the lungs and chest, opening air passages. (medi-vet.com)
  • Chronic
  • Horita N, Miyazawa N, Kojima R, Inoue M, Ishigatsubo Y, Kaneko T. Chronic Use of Theophylline and Mortality in Chronic Obstructive Pulmonary Disease: A Meta-analysis. (medscape.com)
  • adverse effects
  • Some of the adverse effects associated with theophylline appear to be mediated by inhibition of PDE III (e.g., hypotension, tachycardia, headache, and emesis) and adenosine receptor antagonism (e.g., alterations in cerebral blood flow). (nih.gov)
  • side
  • There is a narrow margin between the blood level of theophylline that is needed for the medicine to be effective and the blood level that is high enough to cause side effects. (netdoctor.co.uk)
  • Theophylline oral tablet doesn't cause drowsiness but it can cause other side effects. (healthline.com)
  • Using theophylline together with formoterol may increase cardiovascular side effects such as heart palpitations, increased heart and pulse rates, and blood pressure elevations. (drugs.com)
  • 1-4 These findings have led some researchers to suspect that some of the many side effects of theophylline could be caused, at least in part, by interference with B 6 activity. (portsmouthhospital.com)