<i>United States, insulin is very expensive—that cost was </i>likely <i>a large proportion of the $176 billion in medical expenditures incurred by diabetes patients in 2012 alone.</i><p>Well, the report itself says:<p><i>prescription medications to treat complications of diabetes (18%)</i><p>So this is up to $31.68 billion in 2012. I will assume for simplification that all of it goes for insulin.<p>There are about 20 million patients in US (according to <a href="http:&#x2F;&#x2F;www.diabetes.org&#x2F;diabetes-basics&#x2F;statistics&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.diabetes.org&#x2F;diabetes-basics&#x2F;statistics&#x2F;</a>). So this puts us into $100-150 in a month range for the insulin.