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.
Second Dose of Vaccine Even More Effective. Only a few cases were severe, however, prior to the vaccination era, the majority of kids experienced severe symptoms. Prevention of moderate to severe chicken pox was successfully reached after one dose of varicella vaccine - no cases were documented after the second dose.