I have read to take ivermectin first and then take praziquantel second. I have not found out how long to take Iver...and how long to wait to take Praz...what I have read is Ivermectin is supposed to be a wonder drug. I am on pyrantel pamoate right now and like the results very much. I am on the second day, going to try and take it for 7 days straight. I also took magnesium citrate yesterday, lots of dark stool coming out today, yesterday, liquid. Will take that again. Will research that in regards to how often, bottle says 1 x 24 hours....great stuff! Not read about this on CZ before but thinking logically about this.