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.
They also eat ants, wasps and bees, flies, Myriapods, angleworms (Oligochaetest), snails, sow bugs (Isopodan), and black olive scales (Homoptera), moths, weevils and termites. (BNA). Bluebirds love mealworms. Occasionally they catch insects in flight, especially when its warmer and flying insects are abundant. The proportion of insects in the food bluebirds collect during nesting season is probably significantly higher than 68%.