Not necessary: Simvastatin 40mg is similar in potency to 20mg of lipitor (atorvastatin). There is no need to stop Lipitor (atorvastatin) for a few days before starting Simvastatin as they are similar drugs (both are statins). The Simvastatin can be started the day after stopping the Lipitor (atorvastatin) -- for most efficacy, take a statin at bedtime.
Answered 5/8/2017
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Yes: Very smart good question. It depends how long you've been on lipitor (atorvastatin). 4-6 weeks should be ample time between them.
Answered 12/20/2012
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