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.
Rectal dose constraints for intensity modulated radiation therapy of the prostate. Swanson GP(1), Stathakis S. Author information: (1)Department of Radiation Oncology, University of Texas Health Science Center, San Antonio, TX 78229, USA.he most disabling toxicity in prostate cancer radiotherapy is rectal. We evaluated the current status of conformal radiation and late rectal toxicity with the goal of determining whether reasonable rectal dose and volume constraints can be determined.