The nurse is caring for a client receiving theophylline for asthma. In reviewing client labs, the nurse understands that the dose is therapeutic when the drug level is at what concentration?

  • 0.8 – 2 mcg/L
  • 10 – 20 mg/L
  • 10 – 20 mcg/mL
  • 0.8 – 12 mmol/L
Number 3 is correct.
The therapeutic level of theophylline is 10 – 20 mcg/mL. Option 1 represents the therapeutic level of digoxin. Option 2 represents the therapeutic level of phenytoin. Option 4 represents the therapeutic level of lithium.