My Baby Is 24 Days Old. She Is Crying Due

my baby is 24 days old. she is crying due to lack of milk , i tried to feed hrr with formula milk but she refuse to take it , whenever i give her she is crying and wont take a drop of it. now i am taking lactare capsules 2 per 3 times a day also galact granules 2 times a day withmilk. how log should i continue this to get enough milk for my baby and is there any side effects for lactare capusules?