I am ADD and have been on several stimulants for 30 years. I take Dextroamphetamine 15mg. 3x daily. Since I have taken this drug pre- and post-covid, I can tell you that long covid does not change the effectiveness.
But I caution those who are considering a prescription Dex., remember that it should not replace rest. I take a holiday day each month and it isn’t comfortable. I also strongly suggest that while you are starting this drug, be sure that you take the dose as prescribed. It is easy to build a tolerance. I am
certain that Dex. has enabled me to do more and think better. I pray that it helps some of you who struggle with fatigue.