The thought is that cholesterol formation in the liver is highest when sleeping, so a shorter acting statin would have the highest blood levels in the blood if taken at bedtime.
Some statins that have a longer time in the blood, so less of an issue.
According to their fda package inserts:
pravachol, crestor, and Lipitor (atorvastatin) can be taken at any time. Zocor is reported to take in evening.
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