LOL. It was the Lincoln REGIME that refused to exchange prisoners, refused the South medical supplies to be used on Northern prisoners, and by the end of the war refused to simply accept their prisoners without exchange. It was the Lincoln REGIME that starved/froze Confederate soldiers while Union troops were warm and well-fed. Dictator Lincoln even refused to meet a delegation of Union POW's released from Adnersonville. A Union POW [James M. Page] refutes your oft asserted canard, 'When they [ex-slaves] were captured they were either sent back to their old masters or put to work on rebel fortifications, and they were not starved and did not suffer. ... When the Andersonville emissaries returned from Washington there was not one word about the exchange of Negro soldiers being in the way of our release.'
Yankees, under Dictator Lincoln's leadership, DESPITE having abundant food and medicine, had more POW's in their care die (26,000 versus 22,000), as well a having a higher percentage of POW's die (11.2% versus the Confederacy's 8.1%). All in all, the death rate of POW's was 45% higher in Yankee camps despite the plethora of food and medicine in the North.
Face the facts, MORE POW's died under ther Lincoln REGIME, a higher percentage died under the Lincoln REGIME, Southern treatment of blacks POW's was not the reason to stop the exchanges, it was solely due to the Lincoln REGIME refusing to exchange POW's. Thanks to boneheaded, unhumanitarian decisions by dictator Lincoln, 48,000 men died needlessly.
It was the Davis REGIME that announced that certain Union generals would be refused the protections of POW status if caught, it was the Davis REGIME that announced that black Union soldiers captured would be returned to slavery, and it was the Davis REGIME that announced that white officers caught while commanding black soldiers would be charged with slave insurrection and tried and executed accordingly.
And another thing. The Union prisoners of war died from exposure, starvation, scurvy, typhus, typhoid, dysentery, and the like. Assuming that the North complied witht hte southern request, and assuming any of the medications actually made it to the POWs they were intended for, what medications were the North supposed to be sending?