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Aminophylline is FDA-approved to treat reversible airway obstruction due to asthma or other chronic lung diseases. This activity illustrates the indications, mechanism of action, pharmacokinetics, and adverse effects of aminophylline. In addition, it stresses the role of health care providers in meticulously monitoring the drug concentrations to avoid toxicity owing to the narrow therapeutic index. Objectives: Explain the mechanism of action of aminophylline. Review the indications of aminophylline. Describe the adverse effects of aminophylline. Outline the importance of collaboration and coordination among the healthcare team to enhance patient care when dosing and monitoring aminophylline to improve patient outcomes for patients with asthma exacerbations and minimize side effects. Access free multiple choice questions on this topic.

The concentration of theophylline in acute toxicity is greater than 20 mcg/mL. Aminophylline toxicity can present with the following clinical features. Nausea and intractable vomiting Seizures Cardiac arrhythmias Multifocal atrial tachycardia Cardiac arrest Rhabdomyolysis[22] Death[23] Overdose Management Institute supportive care, including establishing intravenous access, maintenance of the airway, and electrocardiographic monitoring. Serum electrolytes and glucose should be measured on presentation and at appropriate intervals indicated by clinical circumstances. Clinicians should promptly correct fluid and electrolyte abnormalities. Serum Theophylline Concentration Monitoring: Measure the serum theophylline concentration immediately upon presentation and every 4 hours to guide treatment decisions. Because of the increased morbidity and mortality associated with theophylline-induced seizures, treatment should be aggressive. Administer intravenous benzodiazepines such as lorazepam or diazepam. In addition, clinicians should consider phenobarbital for refractory seizures. Treat cardiac arrhythmias as per ACLS and PALS guidelines. Enhance clearance of theophylline with the use of multiple-dose oral activated charcoal.[24] Extracorporeal Removal: Charcoal hemoperfusion is the most effective method of extracorporeal removal. Monitor for severe complications such as bleeding diathesis, hypotension, hypocalcemia. Hemodialysis is as effective as charcoal hemoperfusion for eliminating theophylline. Additionally, it has a lower complication rate than hemoperfusion.[25] Clinicians should continue monitoring and treatment until the serum concentration decreases below 20 mcg/mL.[21]

Aminophylline is an adjunct to beta2-agonists and corticosteroids in treating reversible bronchoconstriction caused by asthma and chronic lung conditions. However, the drug demonstrates a narrow therapeutic index, and even with regular monitoring, it can lead to adverse effects. Without precise management, the morbidity and mortality from aminophylline overdose are high. Therefore Healthcare workers, including nurses, pharmacists, and prescribing clinicians, should be aware of the complications of aminophylline toxicity. Clinicians should prescribe aminophylline after risk-benefit evaluation for appropriate indications considering the recent global initiative for asthma(GINA) guidelines and global initiative for chronic obstructive lung disease(GOLD) guidelines.[26] Patients who receive aminophylline must be monitored for serum concentrations of the drug to ensure they are within therapeutic serum concentrations. There is no specific antidote to reverse toxicity, so it is vital to avoid taking high doses without approval from the clinician. Nursing staff can monitor vital signs and treatment effectiveness and communicate with the healthcare team if they notice any adverse event. The pharmacist should suggest a safer option for treating asthma to clinicians who prescribe this drug, verify dosing, perform thorough medication reconciliation, alert the team to any issues. Also, drug interactions and concurrent illnesses require strong consideration before initiating treatment as clearance rates vary widely. In cases of acute overdose, tirage nurses and emergency department physicians should rapidly stabilize patients and promptly initiate treatment. Clinicians should consult intensivists for refractory seizures, arrhythmias, and hypotension. Nephrologist consultation is necessary for hemodialysis. As illustrated above, multiple healthcare providers, including clinicians(MDs, DOs, NPs, PAs), specialists, nurses, pharmacists, are involved in taking care of the patient receiving aminophylline therapy. Hence, only through a collaborative, interprofessional team approach can the morbidity of this medication be lowered while achieving improved outcomes. [Level 5]