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 <span style = 'background-color: #dae8f4'>during</span> <span style = 'background-color: #dae8f4'>donation</span>
, 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.