Hair, blood, and urine tests aim to solve Doxy-PEP mystery

NCT ID NCT06414408

First seen Apr 24, 2026 · Last updated Jun 11, 2026 · Updated 10 times

Summary

This study looks at why the antibiotic doxycycline prevents sexually transmitted infections (STIs) in some people but not others. Researchers will measure doxycycline levels in hair, blood, and urine from 48 volunteers to develop better ways to track whether participants are taking the medication as directed. The goal is to improve future STI prevention efforts.

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Contacts and locations

Study contacts

  • Contact

    Phone: •••-•••-•••• Email: •••••@•••••

Locations

  • University of California, San Francisco/San Francisco General Hospital

    RECRUITING

    San Francisco, California, 94110, United States

    Contact Email: •••••@•••••

Conditions

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