Can we prevent vasovagal reactions in young inexperienced whole blood donors? A placebo controlled study comparing effects of a 330 vs 500 mL water drink prior to donation

Abstract

In young donors making their 2nd-4th WB donation, drinking water was associated with 23% fewer VVR with no difference between 330 and 500 mL. This decrease was not found in the placebo group. The findings support advocating drinking water for the prevention of VVR.