Respiratory Medicine Guideline

Introduction to Deriphylline

Deriphylline, a methylxanthine derivative, improves the strength and effectiveness of respiratory muscles, which may explain improvements in exercise tolerance in some patients 1

Deriphylline has numerous side effects primarily affecting the gastrointestinal, cardiovascular, and central nervous systems, with the most common being nausea, headache, and cardiac arrhythmias 2

The most common side effects of deriphylline include gastric irritation, nausea, vomiting, diarrhea, abdominal pain, and dyspepsia, which are dose-dependent and often the most common reason for discontinuation 2, 3
Cardiovascular side effects include tachycardia, palpitations, cardiac arrhythmias, changes in blood pressure, and increased heart rate 2
Central nervous system side effects include headache, dizziness, insomnia, irritability, anxiety, tremor, and seizures at higher concentrations 2
Other side effects include increased diuresis, urinary frequency, decreased appetite, weight loss, and electrolyte disturbances 3
The severity and frequency of side effects are influenced by serum concentration, with side effects increasing considerably at levels >15 μg/mL 2

Drug interactions, such as those with cimetidine, ciprofloxacin, and oral contraceptives, can increase deriphylline levels, while smoking, alcohol, and anticonvulsants can decrease levels 2
Patient factors, including age, liver or heart failure, and sustained fever, can also influence the severity and frequency of side effects 2

To minimize adverse effects, monitoring of blood levels is recommended, with a therapeutic range of 5-15 μg/mL, and regular checks after initiation, dose changes, or addition of interacting medications 2, 3
Starting with low doses and titrating slowly, as well as considering administration with food to reduce GI side effects, can also help minimize adverse effects 2, 3

Deriphylline should be avoided in patients with uncontrolled hypertension, underlying coronary artery disease, tachyarrhythmias, seizure disorders, or severe hepatic impairment 3
Withdrawal rates of up to 27% have been reported in the first 3 months of therapy due to side effects 3