dragoon - a member of a European military unit formerly composed of heavily armed cavalrymen. 1  cavalryman, trooper - a soldier mounted on horseback; a cavalryman always takes good care of his mount.
However, milder products (e.g., stool softeners, bulk-forming laxatives) should be used whenever possible for constipation. Magnesium citrate is a saline laxative that is thought to work by increasing fluid in the small intestine. It usually results in a bowel movement within 30 minutes to 3 hours.
From http://www.associatedcontent.com/article... If you don't have a bowel movement soon after taking your first dose do not take another dose for the next 24 hours. Magnesium Citrate typically takes one to four hours to produce a bowel movement, but severe cases of constipation may require more time.