What is the recommended doxycycline duration for early Lyme disease?

• A. 5 days
• B. 10–21 days
• C. 7 days
• D. 28 days

Answer: (B)

In early Lyme disease, the goal of doxycycline therapy is to eradicate the infection with a duration long enough to prevent relapse but not so long as to cause unnecessary toxicity. Guidelines consistently support a total course of about 10 to 21 days for adults and children able to take oral doxycycline. A 10–14 day course is commonly effective, with some clinicians extending up to 21 days if there are more extensive or disseminated early manifestations. Shorter durations like 5 or 7 days can be inadequate for complete bacterial clearance, while 28 days is longer than needed for typical early disease and doesn’t provide additional benefit. So the recommended range of 10–21 days best fits early Lyme disease treatment. If doxycycline isn’t suitable (for example, pregnancy, lactation, or a child under 8), alternatives like amoxicillin are used. For neurological or cardiac involvement, intravenous therapy and longer management may be required.