But the relevant bit is 5 years after that, I tried 1/4 the dosage, plus only 15 minutes in the gym every day (1 set of 3-rep max of each of the major lifts). I got just as big, and was actually stronger than I had ever been thru the full dose cycles.
Outside of the gym, I regularly halve the dose of any prescriptions or suggested dose of recreational drugs. A friend even told me he saw a Buddhist monk take a tiny shot of liquor and sit and meditate on that single shot for hours.
And finally, if I may take a sad turn, my father got trigeminal neuralgia but he's largely avoided all drugs all his life, so the standard dose hits him way too hard.