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Merck Acquires Cidara Therapeutics, Boosting Antiviral DFC Pipeline

Cidara Therapeutics acquired by Merck

AcquisitionHealthcare

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Acquired

Cidara Therapeutics

Biotechnology

Undisclosed amount

November 14, 2025

Merck logo
Acquirer

Merck

Pharmaceutical Manufacturing

Merck has acquired Cidara Therapeutics for an undisclosed amount, integrating the biotechnology company's novel antiviral platform and its lead influenza candidate into Merck's infectious disease pipeline. This transaction represents a strategic expansion for Merck in the antiviral treatment and prevention space.

Cidara Therapeutics utilizes its proprietary Cloudbreak® platform to develop novel DFCs (drug-Fc conjugates) that combine targeted small molecules or peptides with a proprietary human antibody fragment. The company’s primary candidate, CD388, is a long-acting antiviral specifically designed for the universal prevention of seasonal and pandemic influenza. CD388 aims to offer protection with a single dose by directly inhibiting viral proliferation. Merck, a global biopharmaceutical company, is recognized for its extensive research, development, and commercialization of innovative medicines, vaccines, and animal health products across various therapeutic areas, including a significant focus on infectious diseases.

The acquisition is strategically important as it provides Merck with Cidara's innovative Cloudbreak® platform and CD388, a promising asset addressing a critical public health need in influenza prevention. Merck's established global infrastructure, deep expertise in clinical development, regulatory affairs, and commercialization capabilities are expected to accelerate the progression and potential market access for CD388. This integration offers Cidara’s platform and candidates the necessary resources to advance through late-stage trials and eventual distribution, leveraging Merck’s scale and reach. The synergy is anticipated to strengthen Merck's overall position in infectious disease treatments and prevention.

The combined entity is poised to enhance the development trajectory of CD388, potentially bringing a new long-acting option for influenza prevention to patients worldwide. Merck's acquisition of Cidara Therapeutics aims to consolidate specialized antiviral technology within a larger pharmaceutical framework, focusing on addressing unmet medical needs in infectious disease management.

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Bioinformatics Software

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