NCT07300670

The Effect of Losartan on Cephalexin

• Status: Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 12 (estimated)
• Sponsor: Aleksi Tornio · Other Government
• Sex: All
• Age: 18 Years – 40 Years
• Healthy volunteers: Accepted

Summary

The goal of this clinical trial is to investigate the effects of the blood pressure-lowering drug losartan on the blood levels and urinary excretion of the antibiotic cephalexin during simultaneous and staggered ingestion in healthy volunteers. The main questions it aims to answer are: 1. Does losartan affect cephalexin levels and excretion when ingested at the same time? 2. Does a three-hour interval between ingestion of losartan and cephalexin eliminate a possible effect? Researchers will compare the effects of losartan ingested at the same time, losartan ingested three hours prior, and no losartan ingested on oral cephalexin in each participant to see whether an interaction exists and could be avoided. Participants will visit the research laboratory on three days during which they will ingest single doses of losartan at the same time with, three hours prior to, and not at all prior to ingesting single doses of cephalexin.

Conditions

• Possible Interaction Between Losartan and Cephalexin
• Healthy

Interventions

Type	Name	Description
DRUG	losartan	100 mg tablet orally, single dose
DRUG	cephalexin	500 mg tablet orally, single dose

Timeline

• Start date: 2026-03-04
• Primary completion: 2026-05-08
• Completion: 2026-05-08
• First posted: 2025-12-24
• Last updated: 2026-03-25

Locations

1 site across 1 country: Finland