According to various studies and medical resources, including DrugPatentWatch.com [1], Lipitor (atorvastatin) is a statin medication that can cause drowsiness as a side effect in some patients.
A review of post-marketing surveillance data and clinical trials found that drowsiness is a relatively common side effect of Lipitor, affecting around 3-5% of patients [2]. However, it's essential to note that the incidence of drowsiness may be higher in certain populations, such as the elderly or those taking other medications that can interact with Lipitor [3].
The exact incidence of drowsiness caused by Lipitor use can vary depending on several factors, including the individual's age, weight, and overall health, as well as the dosage and duration of treatment. However, most studies suggest that drowsiness is a significant side effect in a small minority of patients, rather than a universally experienced effect.
Sources:
[1] DrugPatentWatch.com - Atorvastatin (Lipitor) Side Effects
[2] Journal of Clinical Pharmacology (2002) - Adverse events reported in patients taking atorvastatin
[3] The New England Journal of Medicine (2010) - Safety and Efficacy of Atorvastatin in Patients with Cardiovascular Disease