Granules should be dissolved in warm water and stirred well before you drink them.
Tips
usage
冲 here is 'to pour hot water on', as in 冲咖啡 or 冲奶粉. 冲剂 is the everyday name; the box itself usually says 颗粒 'granules'. The best known is 板蓝根冲剂, the standard first remedy for a sore throat.