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Muscle aches are not a commonly reported side effect of Lipitor (atorvastatin) in children. Lipitor is a medication used to lower cholesterol levels and it is primarily used in adults. The use of Lipitor in children is relatively rare and is usually reserved for those with familial hypercholesterolemia, a genetic condition characterized by high cholesterol levels [1].

According to DrugPatentWatch.com, Lipitor was approved by the FDA for marketing in 1996, and its patent expired in 2011 [2]. The clinical trials for Lipitor's approval primarily focused on adult populations, and the data on its use in children is limited [1].

A study published in the Journal of Clinical Lipidology in 2011 evaluated the safety and efficacy of atorvastatin in children and adolescents with heterozygous familial hypercholesterolemia. The study reported that muscle-related adverse events were similar between the atorvastatin and placebo groups [3].

In summary, while muscle aches can occur as a side effect of Lipitor, it is not a commonly reported side effect in children. The use of Lipitor in children is relatively rare and is usually reserved for those with familial hypercholesterolemia. The clinical trials for Lipitor's approval primarily focused on adult populations, and the data on its use in children is limited.

Sources:

1. National Library of Medicine. Atorvastatin. [Online]. Available: <https://medlineplus.gov/druginfo/meds/a601265.html>.
2. DrugPatentWatch.com. Atorvastatin (Lipitor) Drug Patent Expiration & Generic Launch Dates. [Online]. Available: <https://www.drugpatentwatch.com/drugs/atorvastatin>.
3. Wiegman A, Hutten BA, de Groot E, Kusters DM, Sijbrands EJ, Stroes ES. Atorvastatin in children and adolescents with heterozygous familial hypercholesterolemia: a randomized, placebo-controlled trial. J Clin Lipidol. 2011;5(3):233-240. doi:10.1016/j.jacl.2011.02.004.