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Indapamide

Phase 2

Hypertension | Small molecule | Cardiovascular |Alnylam Pharmaceuticals, Inc.|Last Updated: Nov 3, 2025

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment663

FDA Designations

No designations recorded

Clinical trial landscape

Indapamide · 1 trial · 1 indication

Phase 2 1
NCT05103332Zilebesiran as Add-on Therapy in Patients With Hypertension Not Adequately Controlled by a Standard of Care Antihypertensive Medication (KARDIA-2)Hypertension
COMPLETED663 Analytics
PHASE2COMPLETED
Zilebesiran as Add-on Therapy in Patients With Hypertension Not Adequately Controlled by a Standard of Care Antihypertensive Medication (KARDIA-2)
HypertensionUnlock trial analytics

Study Endpoints

Primary Endpoints

Indapamide: Change From Baseline at Month 3 in 24-hour Mean SBP Assessed by ABPM - Censored Data
Baseline and Month 3

24-hour ABPM device was programmed to take readings every 20 minutes during day (6 am- 9:59 pm) and every 30 minutes during night (10 pm-5:59 am). ABPM was considered adequate if: 1. the number of successful daytime readings were ≥33; 2. the number of successful nighttime readings were ≥11; 3. no more than 3 hours are not represented (i.e.,3 sections of 60 minutes where 0 valid readings were obtained). To summarize 24-hour ABPM, the hourly adjusted mean was calculated. Hourly adjusted mean was the average BP for each hour of the day. The 24-hour mean was the average of the hourly means. Least squares (LS) mean and standard error (SE) were calculated using a mixed model repeated measures (MMRM) approach. Hypothetical strategy was used for the intercurrent event of using antihypertensive escape medication, i.e., data for SBP assessed using ABPM, while participants were on and within 2 weeks after stopping any escape medication were censored for this endpoint.

Amlodipine: Change From Baseline at Month 3 in 24-hour Mean SBP Assessed by ABPM - Censored Data
Baseline and Month 3

24-hour ABPM device was programmed to take readings every 20 minutes during day (6 am- 9:59 pm) and every 30 minutes during night (10 pm-5:59 am). ABPM was considered adequate if: 1. the number of successful daytime readings were ≥33; 2. the number of successful nighttime readings were ≥11; 3. no more than 3 hours are not represented (i.e.,3 sections of 60 minutes where 0 valid readings were obtained). To summarize 24-hour ABPM, the hourly adjusted mean was calculated. Hourly adjusted mean was the average BP for each hour of the day. The 24-hour mean was the average of the hourly means. LS mean and SE were calculated using a MMRM approach. Hypothetical strategy was used for the intercurrent event of using antihypertensive escape medication, i.e., data for SBP assessed using ABPM, while participants were on and within 2 weeks after stopping any escape medication were censored for this endpoint.

Olmesartan: Change From Baseline at Month 3 in 24-hour Mean SBP Assessed by ABPM - Censored Data
Baseline and Month 3

24-hour ABPM device was programmed to take readings every 20 minutes during day (6 am- 9:59 pm) and every 30 minutes during night (10 pm-5:59 am). ABPM was considered adequate if: 1. the number of successful daytime readings were ≥33; 2. the number of successful nighttime readings were ≥11; 3. no more than 3 hours are not represented (i.e.,3 sections of 60 minutes where 0 valid readings were obtained). To summarize 24-hour ABPM, the hourly adjusted mean was calculated. Hourly adjusted mean was the average BP for each hour of the day. The 24-hour mean was average of the hourly means. LS mean and SE were calculated using a MMRM approach. Hypothetical strategy was used for the intercurrent event of using antihypertensive escape medication, i.e., data for SBP assessed using ABPM, while participants were on and within 2 weeks after stopping any escape medication were censored for this endpoint.

Secondary Endpoints

Indapamide: Change From Baseline at Month 3 in Office SBP - Censored Data
Baseline and Month 3
Indapamide: Time-adjusted Change From Baseline Through Month 6 in 24-hour Mean SBP, Assessed by ABPM - All Collected Data
Baseline through Month 6
Indapamide: Time-adjusted Change From Baseline Through Month 6 in Office SBP - All Collected Data
Baseline through Month 6
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Placebo (Add-on to Indapamide)PLACEBO_COMPARATORFollowing a 4-week run-in treatment on indapamide, 2.5 milligrams (mg), orally, once daily (QD), eligible participants were randomized to receive placebo matched to zilebesiran as a subcutaneous (SC) injection on Day 1 of 6-month double-blind (DB) treatment period as add-on therapy to indapamide. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran once every 6 months (Q6M) during the open-label extension (OLE) period. Upon implementation of Amendment 3, the OLE period was closed.
Zilebesiran (Add-on to Indapamide)EXPERIMENTALFollowing a 4-week run-in treatment on indapamide, 2.5 mg, orally, QD, eligible participants were randomized to receive zilebesiran 600 mg, as a SC injection on Day 1 of 6-month DB treatment period as add-on therapy to indapamide. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran, Q6M during the OLE period. Upon implementation of Amendment 3, the OLE period was closed.
Placebo (Add-on to Amlodipine)PLACEBO_COMPARATORFollowing a 4-week run-in treatment on amlodipine, 5 mg, orally, QD, eligible participants were randomized to receive placebo matched to zilebesiran as a SC injection on Day 1 of 6-month DB treatment period as add-on therapy to amlodipine. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran Q6M during the OLE period. Upon implementation of Amendment 3, the OLE period was closed.
Zilebesiran (Add-on to Amlodipine)EXPERIMENTALFollowing a 4-week run-in treatment on amlodipine, 5 mg, orally, QD, eligible participants were randomized to receive zilebesiran 600 mg, as a SC injection on Day 1 of 6-month DB treatment period as add-on therapy to amlodipine. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran, Q6M during the OLE period. Upon implementation of Amendment 3, the OLE period was closed.
Placebo (Add-on to Olmesartan)PLACEBO_COMPARATORFollowing a 4-week run-in treatment on olmesartan, 40 mg, orally, QD, (or 20 mg, orally, QD for participants with creatinine clearance ≤60 milliliters per minute \[mL/min\] at screening enrolled at sites outside of the United States \[US\] consistent with local labeling), eligible participants were randomized to receive placebo matched to zilebesiran as a SC injection on Day 1 of 6-month DB treatment period as add-on therapy to olmesartan. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran Q6M during the OLE period. Upon implementation of Amendment 3, the OLE period was closed.
Zilebesiran (Add-on to Olmesartan)EXPERIMENTALFollowing a 4-week run-in treatment on olmesartan, 40 mg, orally, QD, (or 20 mg, orally, QD for participants with creatinine clearance ≤60 mL/min at screening enrolled at sites outside of the US consistent with local labeling), eligible participants were randomized to receive zilebesiran 600 mg, as a SC injection on Day 1 of 6-month DB treatment period as add-on therapy to olmesartan. Participants received protocol-assigned background medication for 6 months, after which it was discontinued. Thereafter, participants will receive zilebesiran, Q6M during the OLE period. Upon implementation of Amendment 3, the OLE period was closed.

Interventions

NameTypeDescription
IndapamideDRUGIndapamide administered orally
AmlodipineDRUGAmlodipine administered orally
OlmesartanDRUGOlmesartan administered orally
PlaceboDRUGPlacebo administered by SC injection
ZilebesiranDRUGZilebesiran administered by SC injection
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites110

Inclusion Criteria: * Office SBP at Screening as follows: 1. ≥155 mmHg and ≤180 mmHg for patients with untreated hypertension 2. ≥145 mmHg and ≤180 mmHg for patients on antihypertensive medications * 24-hour mean SBP ≥130 mmHg and ≤160 mmHg by ABPM after at least 4 weeks of run-in Exclusion C...

Countries:United StatesCanadaEstoniaGermanyLatviaLithuaniaPolandUnited Kingdom
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Frequently asked questions about Indapamide

What is Indapamide used for?

Indapamide is a small molecule being studied for the treatment of hypertension. It is currently in Phase 2 clinical development as an add-on therapy for patients whose blood pressure is not adequately controlled by a standard of care antihypertensive medication.

Who makes Indapamide?

Indapamide is being developed by Alnylam Pharmaceuticals, Inc. (NASDAQ: ALNY). The company is conducting clinical trials to evaluate the drug as an add-on treatment for hypertension.

What phase is Indapamide in?

Indapamide is in Phase 2 clinical development. It is an investigational drug and has not been approved by regulatory authorities. One Phase 2 trial has been completed, and the drug is not currently in any active trials.

What clinical trials is Indapamide in?

Indapamide was studied in the KARDIA-2 trial (NCT05103332), a Phase 2, randomized, double-blind, placebo-controlled study. The trial enrolled 663 participants with hypertension across the United States, Canada, Estonia, Germany, Latvia, Lithuania, Poland, and the United Kingdom.

Is Indapamide the same as zilebesiran?

Indapamide is not the same as zilebesiran. The KARDIA-2 trial evaluated zilebesiran as an add-on therapy to a standard of care antihypertensive medication, which may include indapamide. Indapamide is a separate drug being developed by Alnylam Pharmaceuticals.