Noelting J, Zinsmeister AR, Bharucha AE Validating endpoints for therapeutic trials in fecal incontinence. Neurogastroenterol Motil. 2016 Aug;28(8):1148-56. doi: 10.1111/nmo.12809. Epub 2016 Mar 6.
Palmer KR, Corbett CL, Holdsworth CD Double-blind cross-over study comparing loperamide, codeine and diphenoxylate in the treatment of chronic diarrhea. Gastroenterology. 1980 Dec;79(6):1272-5.
Read M, Read NW, Barber DC, Duthie HL Effects of loperamide on anal sphincter function in patients complaining of chronic diarrhea with fecal incontinence and urgency. Dig Dis Sci. 1982 Sep;27(9):807-14.
Simrén M, Palsson OS, Heymen S, Bajor A, Törnblom H, Whitehead WE Fecal incontinence in irritable bowel syndrome: Prevalence and associated factors in Swedish and American patients. Neurogastroenterol Motil. 2017 Feb;29(2). doi: 10.1111/nmo.12919. Epub 2016 Aug 31.
Sjödahl J, Walter SA, Johansson E, Ingemansson A, Ryn AK, Hallböök O Combination therapy with biofeedback, loperamide, and stool-bulking agents is effective for the treatment of fecal incontinence in women - a randomized controlled trial. Scand J Gastroenterol. 2015 Aug;50(8):965-74. doi: 10.3109/00365521.2014.999252. Epub 2015 Apr 20.
Sun WM, Read NW, Verlinden M Effects of loperamide oxide on gastrointestinal transit time and anorectal function in patients with chronic diarrhoea and faecal incontinence. Scand J Gastroenterol. 1997 Jan;32(1):34-8.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
