I start my pediatric rotation next semester in a pediatrician office. I just want to know how to round my drug calculations for these patients I looked up some examples and wanted to know if I'm right. Physician orders Tylenol 15 mg per kg per dose for 1 year old that weighs 21lbs amount on hand is 160mg/5ml how many ml would you administer per dose? My answer comes out to 4.474 ml. Is this amount rounded to the tenths or hundredths place? Also another question a a 35 lb child is ordered rocephin 50mg per kg IM divided in 2 doses amount available is 350 per ml? I come up with 2.27 ml divided by 2 which come out to be 1.136 ml which I rounded to 1.1ml.