Why don't health insurance companies charge a higher co-pay for a higher does of a drug?

So, if you get 20mg of Viagra it costs the same as five. 25mg of Effexor x3 daily, same as if you took one a day. Why is that? It makes no sense in business.

Ryan M2012-03-14T17:47:58Z

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You don't think that all drugs of the same dose cost the same....do you???