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Cranberries are considered safe for patients who take Warfarin (Coumadin®). All recent larger studies point to the fact that there is no interaction between cranberry and blood thinners. Therefore, experts believe that cranberries, and cranberry products, are safe to consume with Coumadin®. 
Scientific evidence shows that the consumption of cranberry juice does NOT increase urinary oxalate levels or increase the risk of stone formation. In fact, studies have shown that cranberry juice may suppress kidney stone formation by LOWERING urinary oxalate excretion and increasing citrate excretion, which tends to prevent stone formation. 
D-mannose is a sugar found naturally in many fruits and berries. However, unlike glucose, a sugar that we have all heard about, D-mannose is absorbed very slowly in the gut making it safe for people whith diabetes.