Calfactant, also known as Infasurf,[1] is an intratracheal suspension derived from the natural surfactant in calf lungs.

[2] Lung surfactant is essential for effective ventilation as it modifies alveolar surface tension.

[3] IRDS is caused by a lung surfactant deficiency.

Calfactant serves as a substitute for the natural surfactant.

[2] This drug article relating to the respiratory system is a stub.