PK, PD and Safety Comparative Trial of Isosorbide Mononitrate Gel in Healthy Participants and With Anal Fissure

"Healthy volunteers will receive 2g (2.0%) of investigational product at a single dose, and will undergo a washout period of 7 days; subsequently, they will receive 2g of investigational product once daily, for 7 consecutive days.~Participants with anal fissure will receive 2g of investigational product, either at 0.5%, 1.0% or 2.0%, at a single dose, and will undergo a washout period of 7 days; subsequently, they will receive 2g of investigational product, either at 0.5%, 1.0% or 2.0%, once daily, for 7 consecutive days."