16th May 2025

Mrs Baker is a 38-year-old lady who has chronic asthma for which she currently takes Fostair, montelukast, theophylline, and salbutamol.

Mrs Baker is a 38-year-old lady who has chronic asthma for which she currently takes Fostair, montelukast, theophylline, and salbutamol. She was seen in a routine follow up clinic where she feels that her asthma control has worsened slightly, and she is using her salbutamol inhaler more frequently than usual. A theophylline level was taken which showed a level of 6mg/L. A decision was made to increase her theophylline dose. When should a theophylline level be taken?

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