Superdrol has a host of bad side effects! How the fuck is "they"? In case you didn't know, it's a DESIGNER STEROID. Yep, a steroid. Anything you take orally will be pretty toxic to your liver. So, even if you took ALL your protectants such as milk thistle, NAC, ect, you will probably STILL have some pretty bad sides. I myself ran a 3 week cycle of only 10 fucking milligrams (1 pill per day), and I had terrible lower back pain/cramps as well as pretty bad lethargy. BTW, I'm tipping the scales at 255 lbs, so its pretty potent stuff.
Just to reiterate in case you're still gonna do it: Time ON equals time OFF... At bare minimum. Doing 3 weeks on, then 3 weeks off will shut your natural test production down so hard it's not even funny.
So if you did a 3 week cycle (including all the protectants taken during cycle), THEN ran your PCT (post cycle therapy) for another 4 weeks, you'd need to wait at least 7-8 weeks after your final week of PCT.
..And PCT does NOT include something like 6-OXO or something found at every GNC. I know I've seen some ponce over at BN do that, which is laughable. You'd need clomid or nolvadex at minimum. Of course that's debatable, but I would never risk running anything less than the best.
Do some real research before you decide. You don't seem to know much about superdrol and the effects of steroids. No offense. I just wouldn't feel right without warning you.