Atropine degrades slowly, typically wearing off in 7 to 14 days, so it is generally used as a therapeutic mydriatic, whereas tropicamide (a shorter-acting cholinergic antagonist) or phenylephrine (an Î±-adrenergic agonist) is preferred as an aid to ophthalmic examination.
Read More. The normal ammonia range is 10â47 Î¼mol/L. High ammonia levels and signs of hepatic encephalopathy is a worsening of brain function that occurs when the liver is no longer able to remove toxic substances in the blood due to cirrhosis. Symptoms may be mild at first.
Quick Answer. Normal blood urea nitrogen levels generally range from 7 to 20 milligrams per deciliter, according to Mayo Clinic. This range, however, varies with age and the reference range that the laboratory uses. An individual needs to seek an explanation of his BUN test results from the doctor. Continue Reading.