Can I use Ephedrine (ephedrine (ephedrine sulfate) sulfate) to improve my alertness on extremely busier days? If ephedrine (ephedrine sulfate) is a stimulant, what is the safest dose to take it and reduce sleepiness at day time?

Ehedrine. Recommend you check the Rand Report at http://www.rand.org/pubs/research_briefs/RB4556/index1.html You may have been much younger when it was pulled off the market for a period of time, but I personally knew a young man , 25, military and no heart disease history, training on a hot day and died of a heart attack, that was linked to his use of ephedrine (ephedrine sulfate) years before. He had not taken for 5+year.
Not safe. It is inappropriate to take ephedrine (ephedrine sulfate) as a pick me up, as it can have harmful effects on your blood pressure and it accelerates your heart rate which can be dangerous. Instead have a cup of coffee but too much caffeine is also unhealthy potentially affecting the blood pressure and heart rhythm as well.