Loperamide 1980s, prior to the expiration of US patent on 30 January 1990, McNeil company started to develop Imodium Advanced containing loperamide and simethicone for treating both diarrhea and gas. In March 1997, the company patented such combination. The drug was approved in June 1997 by the FDA as Imodium Multi-Symptom Relief in the form of a chewable tablet. In November 1993, loperamide was launched as an orally disintegrating tablet based on Zydis technology. Imodium Instant Melts from Johnson & Johnson is currently the only loperamide available in the form of orally disintegrating tablets. In 2013, loperamide in the form of
Number needed to treat Number needed to treat The number needed to treat (NNT) is an epidemiological measure used in communicating the effectiveness of a health-care intervention, typically a treatment with medication. The NNT is the average number of patients who need to be treated to prevent one additional bad outcome (e.g. the number of patients that need to be treated for one of them to benefit compared with a control in a clinical trial). It is defined as the inverse of the absolute risk reduction, and computed as formula_1, where formula_2 is the incidence in the treated (exposed) group, and formula_3 is the