ive looked at the s-drol.....its not the same, but it still works well from what I understand. Still, take milk tistle with the s-drol or h-drol because it still works through the liver from what i understand......you may want to consider a natural test booster like tribulas for afterwords.....now the test booster is not neccasayr, but if natural test levels fall after, it will help keep your gains. This is a cycle i would put somone on if they were going to do it....
eg.
S-Drol weeks 1-4
Milk thistle 1 cap 3x per day weeks 1-6
Tribulas weeks 3-7
also s-drol and h-drol "claims" their replacements, it wont be as strong, but it should still work well.