Ciclesonide, the parent compound, undergoes hydrolysis by ester cleavage at the C21 position to the active metabolite, desisobutyryl-ciclesonide (des-CIC), followed by reversible formation of fatty acid esters within the lung cells. Ciclesonide (5 μM) is rapidly hydrolyzed by normal human bronchial epithelial (NHBE) cells (approximately 30% conversion at 4h), with almost complete conversion by 24 h.
Medlife has not independently confirmed the accuracy of these methods. They are for reference only.