That's because the metabolic pathways available to break down carbs for energy are more efficient than the pathways available for fat breakdown. For long, slower exercise, fat is used more for energy than carbs. When it comes to weight loss, it doesn't matter what type of fuel you use.
1 Cimetidine (Tagamet, Tagamet HB). 2  Cimetidine (Tagamet) is the oldest H2 blocker. 3  It has few side effects; approximately 1% of people taking it will experience mild temporary diarrhea, dizziness, rash, or headache.alcium carbonate (Tums, Titralac, and Alka-2) is a potent and rapid acting antacid that can cause constipation. These antacids are actually sources of calcium. There have been rare cases of hypercalcemia (elevated levels of calcium in the blood) in people taking calcium carbonate for long periods of time.
Cimetidine, sold under the brand name Tagamet among others, is a histamine H2 receptor antagonist that inhibits stomach acid production. It is available over-the-counter and is mainly used in the treatment of heartburn and peptic ulcers. The development of longer-acting H2 receptor antagonists with fewer drug interactions and adverse effects, such as ranitidine and famotidine, decreased the use of cimetidine, and though it is still used, cimetidine is no longer among the more widely used of the H2-receptor antagonists.