Rad-X was changed to work like other drugs with a standard duration of 30 minutes, and an on-screen Rad-X timer was added to bottom right corner along with the other drug timers.
This suggestion is to add RadAway timers there too. We take 1 dose of RadAway now, and it works immediately, and again 10 minutes later, and again 10 more minutes later, but there is no on-screen timer for it.
It could be two timers: one starts at 10 minutes when you first use a RadAway dose, and another for 20 minutes. Take 2 RadAway doses and you'd be able to see the 4 timers on-screen.