|Section2= |Section3= }} Hexamine, also called hexamethylenetetramine or methenamine (INN),'s a heterocyclic organic compound that can be prepared by the reaction of formaldehyde and ammonia. It's crystalline and white in appearance. Particle size ranges from 80-800 micrometres. It's moderately soluble in water and very soluble in most organic solvents. It's a cage-like structure similar to adamantane. It's two very different types of uses: as an antibiotic (commonly the hippurate salt, methena… (More on Hexamine)