Theophylline is a powerful asthma and COPD treatment, but its narrow therapeutic window demands strict blood level monitoring. Too low, and it doesn't work. Too high, and it can be deadly. Here's why skipping monitoring is never an option.
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Digoxin generics may be bioequivalent on paper, but individual absorption varies widely. For this narrow therapeutic index drug, switching between generics without monitoring can cause toxicity or treatment failure. Blood tests and consistency are critical.
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