The cause of irritable bowel syndrome is unknown. Antibiotic-associated colitis usually occurs in people receiving antibiotics. Inflammatory bowel diseases is a common cause of bowel inflammation and low back pain. There are two major forms: Crohns disease and ulcerative colitis. The causes are unknown. â¢Genetic: There is a high similarity of symptoms among identical twins, particularly with Crohn disease.
An effective dose (ED) in pharmacology is the dose or amount of drug that produces a therapeutic response or desired effect in some fraction of the subjects taking it.D50 [edit]. The median effective dose is the dose that produces a quantal effect (all or nothing) in 50% of the population that takes it (median referring to the 50% population base). It is also sometimes abbreviated as the ED50, meaning effective dose, for 50% of people receiving the drug.
median lethal dose (LD 50) the quantity of an agent that will kill 50 per cent of the test subjects; in radiology, the amount of radiation that will kill, within a specified period, 50 per cent of individuals in a large group or population.ffective dose (ED) that quantity of a drug that will produce the effects for which it is administered. See also median effective dose. erythema dose that amount of radiation that, when applied to the skin, causes erythema (temporary reddening). fatal dose lethal dose.