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Encaleret

Phase 3

Autosomal Dominant Hypocalcemia (ADH) | Small molecule | Rare Disease |BridgeBio Pharma, Inc.|Last Updated: Jul 29, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials2
Total Enrollment80

FDA Designations

No designations recorded

Clinical trial landscape

Encaleret · 3 trials · 2 indications

Phase 3 1Phase 2 2
NCT05680818Efficacy and Safety of Encaleret Compared to Standard of Care in Participants With ADH1Autosomal Dominant Hypocalcemia (ADH)
ACTIVE NOT_RECRUITING67 Analytics
PHASE3ACTIVE NOT_RECRUITING
Efficacy and Safety of Encaleret Compared to Standard of Care in Participants With ADH1
Autosomal Dominant Hypocalcemia (ADH)Unlock trial analytics

Study Endpoints

Primary Endpoints

Number of Responders who Achieve Both Albumin-Corrected Blood Calcium (cCa) and 24-hour Urinary Calcium (UCa) Within the Target Range
Up to Week 24

* cCa within 8.3-10.7 mg/dL (2.08-2.68 millimoles per liter \[mmol/L\]) * 24-hr UCa within the reference range (\< 300 mg/day for men \[7.5 mmol/day\], \< 250 mg/day for women \[6.25 mmol/day\])

Period 1: Maximum Plasma Concentration (Cmax) of Encaleret and Metabolites M1, and M3
5 days
Period 1: Area Under the Plasma Concentration-time Curve (AUC) of Encaleret and Metabolites M1, and M3
5 days
Period 3: Number of Participants with Albumin-corrected Blood Calcium (cCa) and Urinary Calcium (UCa) Excretion Response
Week 25
Periods 1, 2 and 3: Number of Participants With Treatment-emergent Adverse Events (TEAEs)
Day 1 up to 16 months

Adverse events (AEs) were defined as any untoward medical occurrence associated with the use of an intervention in humans, whether or not considered intervention-related. Treatment-emergence was defined as any AE(s) regardless of relationship to investigational medicinal product (IMP), that had an onset or worsened in severity on or after the first dose of IMP.

Period 3: Change From Baseline in Albumin-Corrected Blood Calcium Concentrations (cCa)
Baseline, Week 24
Period 3: Rate of Urinary Calcium Excretion
Week 24

Secondary Endpoints

Number of Participants With Intact Parathyroid Hormone (iPTH) Within or Greater than the Reference Range
Up to Week 24
Number of Participants who Achieve Blood Magnesium Within the Reference Range
Up to Week 24
Number of Participants who Achieve Blood Phosphate Within the Reference Range
Up to Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EncaleretEXPERIMENTALParticipants will receive encaleret at a dose as needed based on calcium levels.
Standard of Care (SoC)OTHERParticipants will continue receiving calcium supplements and/or active Vitamin D (calcitriol, alfacalcidol, falecalcitriol, etc.)
Cohort 1: Ascending + Steady-State DoseEXPERIMENTALPeriod 1: Participants will receive an ascending dose of encaleret once daily for the first 3 days. Participants will then receive an individualized dose of encaleret twice daily for 2 days. Period 2: Participants will receive encaleret twice daily for 5 days at a single dose level based on responses from Period 1. Period 3: After completion of Period 2, participants will be eligible to receive encaleret for an additional 24 weeks. Long-Term Extension (LTE): At the end of the study, participants will also have an option to receive encaleret for up to an additional 2 years.
Cohort 2: Steady-State DoseEXPERIMENTALParticipants will directly be enrolled into Period 2, and receive encaleret twice daily at a dose based on data and responses from Cohort 1 Period 1. Period 2: Participants will receive encaleret twice daily for 5 days. Period 3: After completion of Period 2, participants will be eligible to receive encaleret for an additional 24 weeks. LTE: At the end of the study, participants will also have an option to receive encaleret for up to an additional 2 years.

Interventions

NameTypeDescription
EncaleretDRUGAdministered as film-coated tablet for oral use
Standard of CareDIETARY_SUPPLEMENTCalcium supplements and/or active Vitamin D (calcitriol, alfacalcidol, falecalcitriol, etc.)
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Eligibility Criteria

Age Range16 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites25

Key Inclusion Criteria: 1. Participants must have a documented pathogenic or likely pathogenic activating variant, or variant of uncertain significance, of the calcium sensing receptor (CASR) gene associated with biochemical findings of hypoparathyroidism. 2. Participants must have a documented his...

Countries:United StatesAustraliaCanadaCzechiaDenmarkFranceItalyJapanNetherlandsUnited Kingdom
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Recent Changes (Last 90 Days)

LOWAug 1, 2026NCT05680818lastUpdatePostDate: changed
LOWAug 1, 2026NCT05680818lastUpdatePostDate: changed
LOWAug 1, 2026NCT05680818lastUpdatePostDate: changed

Frequently asked questions about Encaleret

What is Encaleret used for?

Encaleret is an investigational small molecule being developed for Autosomal Dominant Hypocalcemia (ADH) and Autosomal Dominant Hypocalcemia Type 1 (ADH1), rare genetic disorders characterized by low blood calcium levels. It is currently in Phase 3 clinical development and has not been approved by regulatory authorities.

Who makes Encaleret?

Encaleret is being developed by BridgeBio Pharma, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol BBIO. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with Autosomal Dominant Hypocalcemia.

What phase is Encaleret in?

Encaleret is in Phase 3 clinical development for Autosomal Dominant Hypocalcemia Type 1 (ADH1). It is an investigational drug, meaning it has not yet been approved by the FDA or other regulatory agencies. A Phase 3 trial comparing it to standard of care is currently active but not recruiting participants.

What clinical trials is Encaleret in?

Encaleret has been studied in several clinical trials. A completed Phase 2 trial (NCT04581629) evaluated its safety and efficacy in 13 participants with ADH1. An active Phase 3 trial (NCT05680818) is comparing it to standard of care in 67 participants. A recruiting Phase 2 trial (NCT07080385) is studying it in pediatric patients.

How does Encaleret work?

Encaleret is a small molecule that targets the calcium-sensing receptor (CaSR), which plays a key role in regulating blood calcium levels. By modulating this receptor, Encaleret aims to correct the underlying calcium imbalance in patients with Autosomal Dominant Hypocalcemia Type 1.

Is Encaleret the same as any other drug?

Encaleret is a distinct investigational compound developed by BridgeBio Pharma. It is not known to be the same as any other marketed drug. Its unique mechanism of action targeting the calcium-sensing receptor differentiates it from standard treatments for hypocalcemia.