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.
Feeding Habits - What Bluebirds Eat. When it comes to feeding, what Bluebirds eat is a large amounts of insects. Eighty percent of their diet comes from insects during spring and summer. In addition to insects, these birds eat berries and fruits off of small trees and shrubs.