I normally flush the line after pushing an IV med if the rate is only 20ml/hr. I believe the volume of most IV tubing is 20-30ml. I normally flush slowly over 1-2 minutes so that I know that my patient does not have to wait for the med to be delivered. This also ensures that the port is clear for any other IV meds to be administered.
My hands used to get so dry that they would crack and the skin would start to peel off the palms of my hand. I have tried several different products. The only thing that I have found that works for me is Mary Kay's satin hands hand cream. It is a new formulation that last through several hand washings. I keep a tube in my pocket and use it several times a day.