Lipitor is a medication used to treat high cholesterol levels. According to Drug Patent Watch [1], Lipitor's active ingredient is atorvastatin, which works by blocking an enzyme that produces cholesterol in the liver. Medical News Today [2] reports that Lipitor can cause side effects such as muscle pain, weakness, and tenderness.

Regarding its interaction with blood pressure medication, Pfizer [3] conducted a study that found that adding Lipitor early to effective blood pressure treatment provided a significant reduction in heart attacks or deaths from heart attacks over five years. The study showed that the combination of Lipitor and blood pressure medication was effective in reducing the risk of cardiovascular events. However, the study did not mention any negative effects of Lipitor on blood pressure medication.

In conclusion, Lipitor is a medication used to treat high cholesterol levels and can cause side effects such as muscle pain, weakness, and tenderness. A study conducted by Pfizer showed that adding Lipitor early to effective blood pressure treatment can reduce the risk of cardiovascular events. However, there is no evidence to suggest that Lipitor affects blood pressure medication. It is important to consult a healthcare professional before taking any medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[3] https://www.pfizer.com/news/press-release/press-release-detail/adding_lipitor_early_to_effective_blood_pressure_treatment_provided_a_significant_reduction_in_heart_attacks_or_deaths_from_heart_attacks_over_five_years