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Krro-121
Urea Cycle Disorders, Ornithine Transcarbamylase (Otc) Deficiency, Urea Cycle Disorders, Inborn, Arginase 1 Deficiency, Nags Deficiency, Carbamylphosphate Synthetase I, Ornithine Transporter Mitochondrial 1, Argininosuccinate Synthase, Argininosuccinate Lyase Deficiency, N-Acetyl Glutamate - Synthetase, Citrin Deficiency
Phase I/II
Not Yet Recruiting
Phase 1/2 Study of KRRO-121 in Healthy Volunteers and Patients With UCD
Aug 14, 2026
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FAQ
What are the FDA phases for drug approval?
The FDA approval process for new drugs is divided into several phases:
a. Preclinical testing
b. Phase 1 – Safety and dosage
c. Phase 2 – Effectiveness and side effects
d. Phase 3 – Confirmation of effectiveness, monitoring of adverse reactions, and comparison with existing treatments
e. Phase 4 – Post-marketing studies to track long-term safety and effectiveness
a. Preclinical testing
b. Phase 1 – Safety and dosage
c. Phase 2 – Effectiveness and side effects
d. Phase 3 – Confirmation of effectiveness, monitoring of adverse reactions, and comparison with existing treatments
e. Phase 4 – Post-marketing studies to track long-term safety and effectiveness
What is a clinical trial?
A clinical trial is a carefully designed study in which researchers test a drug, treatment, or medical device in people to evaluate its safety, effectiveness, and potential side effects. These trials are essential for determining whether a new treatment should be approved for widespread use.
What drugs does Korro Bio (KRRO) have in its pipeline
KRRO is currently developing the following drugs: Krro-121, Krro-110. These drug candidates are in various stages of clinical development as the company works toward FDA approval.