Senna is an FDA-approved nonprescription drug. 1  For constipation in adults and children age 12 and over: the usual dose is 17.2 mg daily. Don't take more than 34.4 mg per day.  For constipation in children: 8.5 mg daily increased just enough to cause one bowel movement daily has been used.
Report Abuse. Norovirus lives for WEEKS on surfaces. People are contagious for 2 weeks after all symptoms are gone. People should stay home for 48 hours after all symptoms are gone as well to help prevent the spread of this hightly contagious virus.eport Abuse. Norovirus lives for WEEKS on surfaces. People are contagious for 2 weeks after all symptoms are gone. People should stay home for 48 hours after all symptoms are gone as well to help prevent the spread of this hightly contagious virus.
Most flu viruses can live one to two days on nonporous surfaces, and 8 to 12 hours on porous surfaces. But a 2006 study found that avian influenza seemed particularly hardy, surviving as long as six days on some surfaces. Continue reading the main story.HE BOTTOM LINE Flu viruses tend to survive longer than cold viruses. Credit Christoph Neimann. scitimes@nytimes.com. A version of this article appears in print on December 15, 2009, on page D5 of the National edition with the headline: Flu viruses live longer on surfaces than cold viruses.