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.
Belugas eat a large variety of fish and crustacean species, including salmon, smelt, herring, Arctic and polar cod, shrimp, crabs, mollusks, and marine worms. They feed in both shallow and deep water areas, in both open water and bottom habitats. They have been recorded diving to more than 350 metres to feed.