You would think so, but it doesn't always help. I made sure I drank over 24 oz. of water prior to my last sticks. But, they did not get them on the first try. My first infusion needed 5 sticks, the second and third, three, and the fourth infusion needed 2 sticks. They do not give you any topical meds to dull the pain, nor do they have an AccuVein Vein Finder. I don't know if the latter would ameliorate the problem, however I'm willing to test it.
What finally worked on me was using a baby needle and not having the (don’t know the proper terms) valve that opens and shuts the flow of liquid. Every time they would open the valve my vein would blow.