You will reach high autophagy levels without the laxative. I think the laxative will deplete you of your electrolytes and make the 4 day fast super difficult. I don’t think you should do it.
Just curious, why do you feel the need to take a laxative first?
I’m fairly new to this whole thing but I’ve never seen reference to needing to take a laxative before an extended fast. I can’t see how it benefits.
I wouldn’t think it gets you to a fasted stated much quicker from a digestion standpoint, which is all that’s required as far as I understand. Definitely risks you being at a poor starting point for electrolytes though.