 [ Symptoms ] what dosage of benadryl for a 30 pound 2 year old toddler  at 8 months old my son was prescribed q dryl 1 ml every 6 hours now he is 2 years 2 months and 30 lbs 4 ozs how many  aml or  notsp do i give him now thanks for your time [ Disease ] he can probably handle a 12 tsp 2 5 ml without any problems assuming he does not get wired benadryl makes adults sleepy but children can have a paradoxical effect where they actually become hyper since i do not know anything about your child is medical history or the reason you are using benadryl it would be good to run this dosage adjustment by his pediatrician first if you are treating a drippy nose or allergies there are other antihistamine choices that may be better now that he is two years old