Imodium instant melts get to work within an hour to relieve your short lived and acute episodes of diarrhoea these convenient tablets melt in seconds on your tongue without any need for water so they are ideal for when youre on the go diarrhoea treatment has never been so quick and easy than with imodium instant melting tablets they can also be used for diarrhoea associated with irritable bowel syndrome ibs following guidance from your doctor how does imodium work when something upset