Lipitor, also known as atorvastatin, is a medication that is used to lower cholesterol levels in the blood [1]. According to a press release by Pfizer, a study showed that adding Lipitor early to effective blood pressure treatment provided a significant reduction in heart attacks or deaths from heart attacks over five years [2]. The study showed that the combination of drugs that lower blood pressure and cholesterol could do more to prevent stroke [3]. However, there is no evidence to suggest that Lipitor can reduce the effectiveness of blood pressure medication. In fact, combining Lipitor with blood pressure medication has been shown to have positive effects on heart health. It is important to consult with a healthcare professional before starting any new medication or making changes to an existing medication regimen.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] 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
[3] https://newsroom.heart.org/news/combining-drugs-that-lower-blood-pressure-and-cholesterol-could-do-more-to-prevent-stroke