Comparing 7-day and 14-day doxycycline treatment for multiple erythema migrans

Duration of Doxycycline Treatment in Patients With Multiple Erythema Migrans (MEM). A Randomized Clinical Trial

NA · University Medical Centre Ljubljana · NCT03337932

This study is testing whether a 7-day or a 14-day course of doxycycline works better for people with multiple erythema migrans.

Quick facts

PhaseNA
Study typeInterventional
Enrollment200 (estimated)
Ages18 Years and up
SexAll
SponsorUniversity Medical Centre Ljubljana (other)
Locations1 site (Ljubljana)
Trial IDNCT03337932 on ClinicalTrials.gov

What this trial studies

This study aims to evaluate the effectiveness of two different durations of doxycycline treatment, specifically 7 days versus 14 days, in patients diagnosed with multiple erythema migrans. Participants will receive doxycycline 100 mg orally twice daily for the assigned duration, while controls will not have a history of Lyme disease. The goal is to determine which treatment duration is more effective in managing this condition.

Who should consider this trial

Good fit: Ideal candidates for this study are individuals diagnosed with multiple erythema migrans.

Not a fit: Patients who are pregnant, lactating, immunocompromised, or have serious adverse reactions to doxycycline will not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide clearer guidelines for the optimal duration of doxycycline treatment, improving patient outcomes in managing erythema migrans.

How similar studies have performed: While there have been studies on doxycycline for Lyme disease, this specific comparison of treatment duration is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

• multiple erythema migrans

Exclusion Criteria:

* pregnancy or lactation
* immunocompromised
* serious adverse event to doxycycline
* taking antibiotic with antiborrelial activity within 10 days
* extracutaneous manifestations of lyme borreliosis

Where this trial is running

Ljubljana

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.

View on ClinicalTrials.gov →

Conditions: Erythema Chronicum Migrans

Last reviewed 2026-05-15 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.