Collis Brownes Mixture For Diarrhoea Upset Stomach & Cough Relief 100ml J. Collis Browne’s Mixture can be taken to alleviate the symptoms of diarrhoea & stomach upsets, & is also effective in treating dry, unproductive coughs. It contains a low dose of anhydrous morphine – too little for it to act as a painkiller, but enough for it to have an effect on the digestive tract. It treats diarrhoea by slowing down the contractions of the intestine, allowing more water to be absorbed from digested food. It helps to treat painful, unproductive coughs by suppressing the reflex that produces coughing. J. Collis Browne’s Mixture also contains peppermint oil, which relaxes spasms in the gut. These spasms are often responsible for the pain associated with certain stomach upsets.