The most common go pill is Dexedrine, which is an amphetamine. You can find some more information in this article. When I deployed to Korea for the first time, I did the flight surgeon test of the go and no go pills.
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Adderall, as well as all other amphetamines and dextroamphetamines, is a disqualifying medication for the purpose of airman medical certification with the FAA.
Pilots and air traffic controllers should not use Viagra within 8 hours of performing their (aviation) duties. Levitra, approved by the FDA in August 2003, has a similar profile to Viagra. The FAA initially allowed the use of Levitra in pilots/controllers.
A 20-30-minute map is all you need to help fight pilot fatigue. A short burst of rest will help to improve alertness in your day. However, you want to be sure your nap isn't too long.