Nimodipine is used to reduce problems caused by subarachnoid hemorrhage-SAH. The body naturally responds to bleeding by narrowing blood vessels to slow blood flow. However, when blood has flowed into the brain, stopping blood flow will cause more damage to the brain.

Dengue fever is primarily characterized by fever and bleeding. Bleeding manifestations in dengue can include nosebleeds, bleeding gums, subcutaneous bruising, gastrointestinal bleeding, vaginal bleeding. In severe cases, it can cause red blood cell rupture, vascular leakage, blood concentration, and massive internal and external bleeding, which can be fatal.