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.
Quick Answer. A high blood ammonia level occurs due to the failure of the liver to convert the ammonia in the blood to urea, as stated by WebMD. This may be caused by different conditions, such as severe hepatitis and cirrhosis. This can also be associated with hepatic encephalopathy, an infection that occurs when the liver fails to perform its functions.