Meth and the Brain. Meth releases a surge of dopamine, causing an intense rush of pleasure or prolonged sense of euphoria. Over time, meth destroys dopamine receptors, making it impossible to feel pleasure.
CAUSES OF HIGH AMMONIA. Ammonia is a normal by-product of processing nitrogen in the body, and is excreted as waste in the urine, in healthy people. However, elevated blood ammonia levels can occur when the kidneys or liver are not working properly, allowing this waste to remain in the bloodstream, which can be poisonous to your cells.
Ammonia then goes to the liver, where it is converted into urea, and this travels via the blood to the kidneys, where it is excreted out in urine as a waste product. So, blood tests can determine the level of BUN, or blood urea nitrogen, in your body as an important indicator of liver, and more so kidney, health. The normal range of BUN found in the blood is approximately 8 mg/dL - 18 mg/dL.