Hydrocortisone and Acetic Acid Otic Solution, USP contains Hydrocortisone (1%) and acetic acid, glacial (2%) in a propylene glycol vehicle containing propylene glycol diacetate (3%) and benzethonium chloride (0.02%), sodium acetate (0.015%) and citric acid (0.2%).

Acetic Acid Otic Solution, USP is a solution of acetic acid (2%), in a propylene glycol vehicle containing propylene glycol diacetate (3%), benzethonium chloride (0.02%), sodium acetate (0.015%), and citric acid. The empirical formula for acetic acid is CH3COOH, with a molecular weight of 60.05. The structural formula is: