Current FDA Regulations state that the maximum frequency of donation is once in two days, and no more than two times in a seven day period. Possible side effects that can occur during donation
include dizziness, fainting, nausea, convulsions, and shock. Drinking caffeine-free and non-alcoholic liquid and eating the equivalent of a regular meal within three/four hours of donation should help minimize the possibility of dizziness or fainting due to
a lowering of circulating blood volume.