According to their website (http://www.valeant.com/Portals/25/Pdf/PI/CDV-PI.pdf) CDV is Calcium Disodium Versenate (edetate calcium disodium).
Each dose appears to be 1g.
It looks like Sigma (the people who supply molecular biology labs with really pure chemicals for experiments) sell 1kg for less than $500. http://www.sigmaaldrich.com/catalog/product/sigma/ed2sc?lang...
Thats a huge markup potential, especially considering that Wikipedia says the FDA approved it in 1953, so it's long out of patent ( https://en.wikipedia.org/wiki/Ethylenediaminetetraacetic_aci...).
And, in the UK, the National Health Service used to pay under £8 a dose according to an old copy of the British National Formulary (which is a publication which lists medicines , their uses and prices in the UK).