Lipitor is a medication used to treat high cholesterol levels in the blood, while aspirin is a medication used to prevent blood clots. These two medications are often used together to reduce the risk of heart attack and stroke in patients with high cholesterol levels.

The frequency of taking Lipitor with aspirin should be determined by a doctor based on the patient's individual needs and medical history. According to the HealthCentral article [2], the recommended dosage of aspirin for heart attack and stroke prevention is usually between 81 and 325 milligrams per day. However, the dosage may vary depending on the patient's age, weight, and medical history.

The Drug Patent Watch website [1] provides information on Lipitor's dosage, which is typically 10 to 80 milligrams per day. The dosage of Lipitor may also vary depending on the patient's medical history and other factors.

The study published in the Journal of Experimental & Clinical Cancer Research [3] suggests that the combination of Lipitor and aspirin may have potential as a cancer treatment. However, the study was conducted on mice, and further research is needed to determine the effectiveness and safety of this treatment in humans.

In conclusion, the frequency of taking Lipitor with aspirin should be determined by a doctor based on the patient's individual needs and medical history. The recommended dosage of aspirin for heart attack and stroke prevention is usually between 81 and 325 milligrams per day, while Lipitor's dosage typically ranges from 10 to 80 milligrams per day. It is important to follow the doctor's instructions and to inform them of any side effects or changes in health.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthcentral.com/article/aspirin-lipitor-time
[3] https://jeccr.biomedcentral.com/articles/10.1186/s13046-016-0304-4