Stay-Up (Legal drug) – Stay-Up is a top-selling erection enhancer. References to Stay-Up as an erection enhancer/sex aid include Betrayal in Death and Innocent in Death. Eve Dallas also recommended Stay-Up to Liam Calhoun as, according the her expert's profile of him, she thought he might be a little lacking in that arena (sexually; possibly impotent).
- Though most mentions of Stay-Up include its use as a sexual aid, Eve took Stay-Up in Visions in Death: "And, though she hated them and the jumpy they made her feel, she popped a Stay-Up, shoved a couple more in her pocket for later." (In this instance, Stay-Up seems to be a stimulant; likely similar to Alert-All and/or Wake-Up.)