About H2 blockers. H2 blockers â also known as histamine 2 receptor antagonists â are medications that decrease the amount of acid the stomach produces. These drugs are used to treat various gastrointestinal disorders.2 blockers work by preventing the action of histamine, a substance released by the human immune system during allergic reactions. Histamine normally interacts with gastric H2 receptors to produce stomach acid. The H2 blockers inhibit this response and help reduce gastric acid output.
How long does it take to cook a 2.5-pound meatloaf? Recipes vary, but a meatloaf is generally baked for between 1 to 1 1/2 hours in a 350 to 400 degree oven. The type of meat and fillers used affect the cooking time.
A 2.5 pound meatloaf should be cooked for approximately 1.5 hours  in a preheated 350 degree oven. Cook until the inside of the  meatloaf is 170 degrees or until the juices â¦ are no longer pink or  red.5 people found this useful. typical two pound meatloaf should be covered in foil. Preheat  oven at 375 degrees and back for 80 minutes. Next remove the foil  and cook at 375 for another 15 minutes.  â¦   Works every time!