What are the physical characteristics in magnesium?
Study of samples of magnesium trisilicate mixture BP obtained commercially has shown that redistribution of the mixture into a reasonably well-dispersed suspension becomes increasingly difficult the longer the mixture is stored. This process of compacting is hastened in response to an increase of environmental temperature. It is possibly for this reason that to administer the mixture at some time later than shortly after it has been prepared contravenes the recommendation of the British National Formulary, that ‘it should be recently prepared.’ These findings were reflected in the contrast between gastric aspirates obtained from anaesthetised patients who had received the commercially-obtained antacids and those whose antacid had been prepared by the hospital pharmacy. There was a higher incidence of patients ‘at risk’ because of aspirates with pH value less than 3.0 in the former group. Among the latter group of 131 patients, only one was found to have been ‘at risk’. The importance o
