What is the correct dosage for children's benadryl (diphenhydramine) allergy for 19 month toddler 21.5 lbs? is it ok to use benadryl (diphenhydramine) with alubeterol/prednisone inhalant

1 teaspoon or 5cc's: Benadryl (diphenhydramine) can be used with the Albuterol and Prednisone. The dosage of Benadryl (diphenhydramine) for your child's weight would be about 1 teaspoon (5cc) being that the concentration of the Benadryl (diphenhydramine) is 12.5mg per each teaspoon. Remember, if your child is having breathing problems, always consult with your Pediatrician. Take care.