DISUDRIN & AMBROLEX

Hi. Does anyone know if it's safe for a 4 month old baby to take Disudrin every 6 hours? May sipon and ubo kasi si baby. Reseta ni pedia, Disudrin drops 0.3ml every 6 hours and Ambroxol 0.6ml drops 2x a day. As far as I know, naka-ban ang Disudrin or medicines with phenylpropanolamine sa US. And I saw a post on fb that her pedia Dr. Imperio advised na Disudrin should be given to infants once a day befofe bedtime lang. Ang gulo lang kasi we don't know na ano ba tamang gawin, kasi iba-iba ang opinion ng mga pedia.