From "Valuing Viagra: What Is Restoring Potency Worth?" Effective Clinical Practice, July/August 1999. 2:171-175.
![Figure 1. Back-of-the-envelope calculation for estimating the utility of impotence required for Viagra to be cost-effective (i.e., intervention costs less than $50,000 per quality-adjusted life-year [QALY]).](kwok_fg1.gif)
Figure 1. Back-of-the-envelope calculation for estimating the utility of impotence required for Viagra to be cost-effective (i.e., intervention costs less than $50,000 per quality-adjusted life-year [QALY]).
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