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Armour Thyroid

Phase 2

Hypothyroidism | Small molecule | Endocrine |AbbVie Inc.|Last Updated: Jan 5, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment3,084

FDA Designations

No designations recorded

Clinical trial landscape

Armour Thyroid · 2 trials · 5 indications

Phase 2 2
NCT06345339A Study to Assess the Safety and Efficacy of Oral Armour Thyroid Compared to Synthetic T4 for the Treatment of Primary Hypothyroidism in Adult ParticipantsHypothyroidism
RECRUITING2,800 Analytics
NCT04124705A Study of Armour® Thyroid Compared to Synthetic T4 (Levothyroxine) in Previously Hypothyroid ParticipantsHypothyroidism
COMPLETED284 Analytics
PHASE2RECRUITING
A Study to Assess the Safety and Efficacy of Oral Armour Thyroid Compared to Synthetic T4 for the Treatment of Primary Hypothyroidism in Adult Participants
HypothyroidismUnlock trial analytics
PHASE2COMPLETED
A Study of Armour® Thyroid Compared to Synthetic T4 (Levothyroxine) in Previously Hypothyroid Participants
HypothyroidismUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants who Achieve Thyroid-Stimulating Hormone (TSH) Response
Week 55

TSH response is defined as TSH values falling within 0.45 to 4.12 mIU/L (inclusive). TSH response will be determined at Week 55 and at a prior visit with no out-of-range TSH values in between (response rate is tested against a specified non-inferiority margin).

Number of Participants with Adverse Events (AEs)
Up to approximately 90 weeks

An AE is defined as any untoward medical occurrence in a patient or clinical investigation in which a participant is administered a pharmaceutical product which does not necessarily have a causal relationship with this treatment.

Percentage of Participants With a Sustained TSH Response
End of the titration period (Week 18, 24, 30, or 36) and end of the stabilization period (Week 30, 36, 42, or 48, depending on the length of the titration period).

Sustained TSH response is defined as TSH values that are within the normal reference range of 0.45 to 4.12 mIU/L, inclusive, at both the end of Titration Period and the end of the Stabilization Period.

Secondary Endpoints

Percentage of Participants who Achieve TSH Response
Week 55
Number of Participants Needing Altered Dose Conversion from Synthetic T4 to Armour Thyroid
Up to approximately 29 weeks
Frequency of Dose Titrations During the Double-Blind (DB) Period Among Participants who Achieved TSH Response at the End of the DB Period
Week 55
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group 1EXPERIMENTALParticipants will receive Armour Thyroid for up to 81 weeks.
Group 2EXPERIMENTALParticipants will alternate between Armour Thyroid and synthetic T4 for up to 81 weeks.
Armour® ThyroidEXPERIMENTALParticipants were randomized to receive Armour Thyroid at a dose corresponding to their pre-randomized dose of synthetic T4. During the first 18 to 36 weeks (titration period) the dose of Armour Thyroid could be titrated based on levels of thyroid stimulating hormone (TSH), in order to achieve TSH levels within the normal reference range (0.45 - 4.12 mIU/L, inclusive). Once TSH levels were within the normal reference range, participants continued to receive a stable dose of Armour Thyroid for an additional 12 weeks (stabilization period).
LevothyroxineACTIVE_COMPARATORParticipants were randomized to receive levothyroxine at their pre-randomized dose. During the first 18 to 36 weeks (titration period) the dose of levothyroxine could be titrated based on levels of TSH in order to achieve TSH levels within the normal reference range (0.45-4.12 mIU/L, inclusive). Once TSH levels were within the normal reference range, participants continued to receive a stable dose of levothyroxine for an additional 12 weeks (stabilization period).

Interventions

NameTypeDescription
Armour ThyroidDRUGOral Capsule or Tablet
LevothyroxineDRUGOral Capsule
Armour® ThyroidDRUGAdministered orally once a day. the daily dose could range from 1/4 - 2 grains.
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites139

Inclusion Criteria: * Have a diagnosis of primary hypothyroidism made \>= 12 months prior to Screening. * Be on continuous thyroid replacement therapy of synthetic T4 for primary hypothyroidism for at least 12 months immediately prior to the Screening Visit. * Be on a stable FDA-approved daily dose...

Countries:United StatesPuerto Rico
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Frequently asked questions about Armour Thyroid

What is Armour Thyroid used for?

Armour Thyroid is used for the treatment of hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. It is being studied in adult participants with primary hypothyroidism. The drug is currently in Phase 2 clinical development and is not yet approved by the FDA.

Who makes Armour Thyroid?

Armour Thyroid is being developed by AbbVie Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol ABBV. The company is conducting clinical trials to evaluate the drug's safety and efficacy in treating hypothyroidism.

What phase is Armour Thyroid in?

Armour Thyroid is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. There are two Phase 2 trials, one completed and one currently recruiting participants, studying the drug for the treatment of hypothyroidism.

What clinical trials is Armour Thyroid in?

Armour Thyroid is being studied in two clinical trials. NCT04124705 is a completed Phase 2 study comparing Armour Thyroid to synthetic T4 (levothyroxine) in previously hypothyroid participants, with 284 enrolled. NCT06345339 is a recruiting Phase 2 study assessing safety and efficacy versus synthetic T4 in primary hypothyroidism, with a target enrollment of 2800.

Is Armour Thyroid the same as levothyroxine?

No, Armour Thyroid is not the same as levothyroxine. Armour Thyroid is a natural thyroid extract, while levothyroxine is a synthetic form of the thyroid hormone T4. Clinical trials are comparing Armour Thyroid directly against levothyroxine to evaluate its safety and efficacy in treating hypothyroidism.