Pharmacist
noun
A medicine dose expert is someone who knows exactly how much dose of each medicine you should be getting. The person who specializes in this is a pharmacist.
やくざいし
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
薬剤師は別に白衣を着る必要はないと思うんだよな。
I don’t think pharmacists really need to wear white coats.