Hi, my daughter is 4 years old (14kg), she has phlegm in her throat and she like to hold it in. last night she vomited all her food, after her vomit, it seems her throat is cleared. I ve given her a dose of Phenergan (as it was previously prescribed by her pediatrician) last night. Today, I went to the pharmacy, the pharmacist recommended Rhinathiol Children , since the medicine i ask for is not available. Is it Ok to change medication? Should I just continue to give her Phenergan or changed to Rhinathiol?