Ranitidine is a competitive, reversible inhibitor of the action of histamine at the histamine H2-receptors, including receptors on the gastric cells. Ranitidine does not lower serum Ca++ in hypercalcemic states. Ranitidine is not an anticholinergic agent.
1 The Blue Marlins have a diet of: Octopi, squid and pelagic fish such as black fin tuna and frigate mackerel.  They do prefer to hunt alone and during the day, rather than in schools, so it is safe to say they are a rather antisocial species.
1 If you're wondering why this web page has the name it has, it's because before eating their prey, Blue Marlins will slice it with their bills into smaller pieces.  The largest of the Atlantic Marlins, they can grow up to 3.4 meters, and weigh about 136 kilograms for Males, 180 for females.