All statins are dangerous drugs that can cause MANY side effects. The drs. and the drug co's are doing a SCAM on the anti-cholesterol drugs . . . big $$ business. In reality, your mind/body needs cholesterol to function properly . . . when your cholesterol gets too low, then you will have problems. DON'T LET YOUR DR. TO CON YOU.
You asked how low of a low cholesterol needs to be. The answer is keep lowering it until the drug companies have met their sales quota. Then its time to lower it some more before the consumer figures out it all just a gimmick.