Fumana izinto ezintlanu eziphambili ekufuneka uziqwalasele xa ukhetha i-hydroxypropyl methylcellulose (HPMC) kwizincamathelisi zethayile, kubandakanya ukuxinana, ukugcinwa kwamanzi, kunye nokumelana nokutyibilika, ukuqinisekisa ukubopha kunye nokuqina okufanelekileyo.