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Pyrimethamine

Phase 1

Toxoplasmosis | Small molecule | Other |GSK plc|Last Updated: Mar 27, 2020

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment14
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03258762Phase I Study of Pyrimethamine in Healthy Japanese and Caucasian SubjectsPHASE1 COMPLETED 14Sep 25, 2017Nov 19, 2017Mar 27, 20201 Australia
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Study Endpoints
Primary Endpoints
Maximum Observed Concentration (Cmax) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The Pharmacokinetic (PK) parameters were calculated by non-compartmental analysis. PK Population is defined as all participants who administered at least one dose of study treatment and who have PK sample taken and analyzed.

Area Under the Concentration-time Curve From Time 0 to t (AUC[0-t]) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Area Under the Concentration-time Curve From Time 0 to Infinity (AUC[0-inf]) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Area Under the Concentration-time Curve From Time 0 to 24 (AUC[0-24]) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Terminal Half-life (t1/2) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Time to Maximum Observed Concentration (Tmax) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Apparent Clearance Following Oral Dosing (CL/F) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Apparent Volume of Distribution Following Oral Dosing (Vd/F) of Pyrimethamine in Healthy Japanese Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22

Blood samples were collected at indicated time points. The PK parameters were calculated by non-compartmental analysis.

Secondary Endpoints
Cmax of Pyrimethamine in Healthy Caucasian Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22
AUC (0-t) of Pyrimethamine in Healthy Caucasian Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22
AUC (0-inf) of Pyrimethamine in Healthy Caucasian Male Participants
Pre-dose, 1, 2, 4, 6, 12 hours post-dose on Day 1, Day 2, Day 3, Day 4, Day 6, Day 8, Day 15 and Day 22
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Healthy Japanese male subjectsEXPERIMENTALHealthy Japanese male subjects will receive a single oral dose of Pyrimethamine 50 mg in the fasted state co-administered with calcium folinate 15 mg on Day 1. Oral calcium folinate will be administered once daily until Day 8. Blood samples for PK analysis will be collected prior to administering first dose of Pyrimethamine and over 22 days post dose. Each subject will participate in the study for a duration of approximately 2 months from screening to follow-up.
Healthy Caucasian male subjectsEXPERIMENTALHealthy Caucasian male subjects will receive a single oral dose of Pyrimethamine 50 mg in the fasted state co-administered with calcium folinate 15 mg on Day 1. Oral calcium folinate will be administered once daily until Day 8. Blood samples for PK analysis will be collected prior to administering first dose of Pyrimethamine and over 22 days post dose. Each subject will participate in the study for a duration of approximately 2 months from screening to follow-up.
Interventions
NameTypeDescription
PyrimethamineDRUGPyrimethamine will be available as 25 mg tablets. Subjects will be orally administered two pyrimethamine tablets on Day 1 in a fasted condition with 240 mL of water.
Calcium folinateDRUGCalcium folinate will be available as 5 mg tablets. Subjects will be orally administered three calcium folinate tablets on Day 1 along with pyrimethamine followed by once daily administration of calcium folinate until Day 8. Each administration will be with 240 mL water.
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Eligibility Criteria
Age Range20 Years — 64 Years
SexMALE
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Subjects should be between 20 and 64 years of age inclusive, at the time of signing the informed consent. * Subjects who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests and cardiac monitoring. * Body wei...

Countries:Australia
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