According to the sources provided, there is no clear consensus on how often one should stretch to reduce Lipitor side effects. Lipitor is a commonly prescribed medication used to lower cholesterol levels in the body. One of the most common side effects of this medication is muscle pain and weakness [1].

A study published in the Journal of Clinical Lipidology suggests that stretching and exercise may help reduce muscle pain associated with statin use, including Lipitor [3]. However, the study did not provide specific recommendations on how often to stretch.

The Harvard Health Blog suggests that regular exercise, including stretching, can help reduce muscle pain associated with statin use [2]. The article recommends that individuals should aim for at least 30 minutes of exercise, five days a week, and include both aerobic and resistance training.

In conclusion, while stretching and exercise may help reduce muscle pain associated with Lipitor use, there is no clear consensus on how often to stretch. It is recommended to consult with a healthcare provider or a certified personal trainer to determine an appropriate exercise plan based on individual needs and health status.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.health.harvard.edu/pain/managing-statin-muscle-pain
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/