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Pyrimethamine

Phase 1

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

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment14

FDA Designations

No designations recorded

Clinical trial landscape

Pyrimethamine · 1 trial · 1 indication

Phase 1 1
NCT03258762Phase I Study of Pyrimethamine in Healthy Japanese and Caucasian SubjectsToxoplasmosis
COMPLETED14 Analytics
PHASE1COMPLETED
Phase I Study of Pyrimethamine in Healthy Japanese and Caucasian Subjects
ToxoplasmosisUnlock trial analytics

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 to 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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Frequently asked questions about Pyrimethamine

What is Pyrimethamine used for?

Pyrimethamine is a small molecule drug being developed by GSK plc for the treatment of toxoplasmosis, an infectious disease. It is currently in Phase 1 clinical development and is being studied in healthy volunteers to assess its safety and pharmacokinetics.

Who makes Pyrimethamine?

Pyrimethamine is being developed by GSK plc, a pharmaceutical company listed on the stock exchange under the ticker GSK. The drug is currently in Phase 1 clinical development for the treatment of toxoplasmosis.

What phase is Pyrimethamine in?

Pyrimethamine is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. One Phase 1 clinical trial has been completed to evaluate the drug in healthy subjects.

What clinical trials is Pyrimethamine in?

Pyrimethamine has one completed clinical trial, NCT03258762, a Phase 1 study conducted in Australia. The trial enrolled 14 healthy male subjects aged 20 years and older, including Japanese and Caucasian participants, to evaluate the drug's safety and pharmacokinetics.

Is Pyrimethamine FDA approved?

Pyrimethamine is not FDA approved for the treatment of toxoplasmosis. It is an investigational drug currently in Phase 1 clinical development. The completed trial, NCT03258762, was a Phase 1 study in healthy volunteers, and the drug has not yet progressed to later-stage trials.