I began taking Zocor May 11, 2004. On June 1, I developed a rash that was diagnosed as Shingles. It is believed that the virus that causes Shingles comes from Chicken Pox and lurks dormant in the body until a suppressed immune system provides conditions for eruption. My internet research shows me that Zocor has been shown to alter immune system response. I think the medical profession needs to re-think prescribing Zocor to patients until it is fully understood whether its benefits outweigh its apparent negative effects on the human immune system. I have stopped taking Zocor and plan to look for a means other than drugs to lower my cholesterol levels.