Why does Doxy-PEP fail some people? new study aims to find out
NCT ID NCT06414408
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at why the antibiotic doxycycline, when taken after sex, prevents bacterial 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 if people are taking the medication as directed. The goal is to improve future STI prevention efforts.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of California, San Francisco/San Francisco General Hospital
RECRUITINGSan Francisco, California, 94110, United States
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