Drug Interaction Study of ALXN2050 With Fluconazole and Rifampin in Healthy Adult Participants

A Phase 1 Two-Part Study to Evaluate the Potential Drug Interactions Between ALXN2050 and Fluconazole, and Between ALXN2050 and Rifampin in Healthy Adult Participants

This is a 2-part, open label, fixed-sequence study to evaluate the potential drug interaction between ALXN2050 and fluconazole (Part 1), and between ALXN2050 and rifampin (Part 2) in healthy adult participants. Part 1 will be a 2-period, fixed-sequence study. Part 2 will be a single-period, fixed-sequence study.

Study Overview

• Status: Completed
• Conditions: Healthy
• Intervention / Treatment: Drug: ALXN2050; Drug: Fluconazole; Drug: Rifampin

• Study Type: Interventional
• Enrollment (Actual): 16
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Arizona
    • Tempe, Arizona, United States, 85283
      • Clinical Trial Site

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 55 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

Key Inclusion Criteria:

• Medically healthy with no clinically significant or relevant abnormalities as determined by medical history, physical or neurological examination, vital signs, 12-lead electrocardiogram, screening clinical laboratory profiles.
• Body mass index within the range 18.0 to 32.0 kilograms (kg)/meter squared, inclusive, with a minimum body weight of 50.0 kg at Screening.

Key Exclusion Criteria:

• History of any medical or psychiatric condition or disease that might limit the participant's ability to complete or participate in this clinical study, confound the results of the study, or pose an additional risk to the participant by their participation in the study.
• History of significant multiple and/or severe allergies.
• Any previous procedure that could alter absorption or excretion of orally administered drugs.
• Participation in another investigational drug or investigational device study within 5 half-lives (if known) or 30 days prior to the first dose of study intervention, whichever is longer.
• Body temperature ≥ 38.0°Celsius, at Screening or prior to the first dose of study intervention.
• History of drug or alcohol abuse within 2 years prior to the first dose of study intervention or positive drugs-of-abuse or alcohol screen at Screening or Day -1; current tobacco/nicotine user or smoker or a positive cotinine test at Screening.
• Donation of whole blood from 3 months prior to the first dose of study intervention, or of plasma from 30 days prior to the first dose of study intervention; receipt of blood products within 6 months prior to the first dose of study intervention.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Part 1: ALXN2050 plus Fluconazole; Period 1: Participants will receive a single dose of ALXN2050 alone and in the presence of multiple doses of fluconazole. Period 2: Participants will receive multiple doses of ALXN2050 alone and in the presence of multiple doses of fluconazole. Scheduled pharmacokinetics (PK) blood samples for both ALXN2050 and fluconazole will be collected, with a washout period of at least 14 days between the last dose of fluconazole in Period 1 and the first dose of ALXN2050 in Period 2.	Drug: ALXN2050; Oral tablet.; Other Names: ACH-0145228 (formerly); Drug: Fluconazole; Oral tablet.
Experimental: Part 2: ALXN2050 plus Rifampin; Participants will receive a single dose of ALXN2050 alone and in the presence of both single and multiple doses of rifampin. Scheduled PK blood samples for both ALXN2050 and rifampin will be collected.	Drug: ALXN2050; Oral tablet.; Other Names: ACH-0145228 (formerly); Drug: Rifampin; Oral capsule.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Part 1: Area Under The Concentration-time Curve From Time 0 To Infinity (AUC0-inf) For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 1: Maximum Observed Concentration (Cmax) For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 1: Time To Maximum Plasma Concentration (Tmax) For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 1: Area Under The Concentration-time Curve From Time 0 To The 12-hour Point (AUC0-12) For Multiple Doses Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 1: Cmax For Multiple Doses Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 1: Tmax For Multiple Doses Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Fluconazole	Up to 72 hours postdose
Part 2: AUC0-inf For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed With A Single Dose Of Rifampin	Up to 72 hours postdose
Part 2: Cmax For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed With A Single Dose Of Rifampin	Up to 72 hours postdose
Part 2: Tmax For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed With A Single Dose Of Rifampin	Up to 72 hours postdose
Part 2: AUC0-inf For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Rifampin	Up to 72 hours postdose
Part 2: Cmax For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Rifampin	Up to 72 hours postdose
Part 2: Tmax For A Single Dose Of ALXN2050 When Dosed Alone Versus When Dosed In The Presence Of Steady-state Rifampin	Up to 72 hours postdose

Secondary Outcome Measures

Outcome Measure	Time Frame
Part 1: Area Under The Concentration-time Curve From Time Zero To The 4-hour Time Point (AUC0-4) For ALXN2050 When Dosed In The Morning Versus In The Evening	Up to 12 hours postdose
Participants Experiencing Treatment-emergent Adverse Events	Up to 40 days postdose

Collaborators and Investigators

• Sponsor: Alexion Pharmaceuticals, Inc.

Publications and helpful links

Helpful Links

• Related Info

Study record dates

Study Major Dates

• Study Start (Actual): June 7, 2021
• Primary Completion (Actual): August 23, 2021
• Study Completion (Actual): August 23, 2021

Study Registration Dates

• First Submitted: June 14, 2021
• First Submitted That Met QC Criteria: June 14, 2021
• First Posted (Actual): June 22, 2021

Study Record Updates

• Last Update Posted (Actual): July 16, 2026
• Last Update Submitted That Met QC Criteria: July 15, 2026
• Last Verified: February 1, 2026

More Information

Terms related to this study

• Keywords: Fluconazole; Rifampin; Drug-Drug Interaction; ALXN2050
• Additional Relevant MeSH Terms: Amino Acids, Peptides, and Proteins; Proteins; Heterocyclic Compounds, 1-Ring; Heterocyclic Compounds; Heterocyclic Compounds, Fused-Ring; Azoles; Polycyclic Compounds; Hydrolases; Enzymes; Enzymes and Coenzymes; Heterocyclic Compounds, 4 or More Rings; Rifamycins; Lactams, Macrocyclic; Macrocyclic Compounds; Triazoles; Intracellular Signaling Peptides and Proteins; Carrier Proteins; rho GTP-Binding Proteins; Monomeric GTP-Binding Proteins; GTP-Binding Proteins; GTP Phosphohydrolases; Acid Anhydride Hydrolases; Rifampin; Fluconazole; rhoA GTP-Binding Protein
• Other Study ID Numbers: ALXN2050-HV-105

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No