Imodium instant melts 18 tablets are used to treat two kinds of diarrhoea the two types have different age limits these being short term diarrhoea for adults and children aged 12 and over treats attacks that last up to 48 hours and irritable bowel syndrome diarrhoea more commonly known as ibs for adults and young people aged 18 and over who have been diagnosed with ibs and treats attacks up to 48 hours imodium instant melts contain the active ingredient loperamide hydrochloride which he