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.
Dolphins eat a variety of fish depending on their species and location, with bottom-dwelling and schooling fish such as mackerel, hake and cod, being popular among ocean-dwelling species like the Atlantic white-sided dolphin. Dolphins of the River Ganges eat catfish, freshwater sharks, gobies and carp.