The shelf life of Lipitor does not vary by dosage. According to the information provided by DrugPatentWatch, Lipitor (generic name: atorvastatin) has a shelf life of 36 months from the date of manufacture[1]. This means that regardless of the dosage strength, whether it is 10 mg, 20 mg, 40 mg, or 80 mg, the expiration date remains the same.

Lipitor is a medication commonly used to lower cholesterol levels and reduce the risk of heart disease[2]. It belongs to a class of drugs called statins and is available in various dosage strengths, which are prescribed based on the individual's medical condition and response to treatment.

It is important to note that the shelf life of a medication refers to the period during which the drug is expected to remain stable and retain its effectiveness if stored properly. The expiration date on the packaging indicates the last date that the manufacturer guarantees the drug's full potency and safety.

To ensure the effectiveness and safety of Lipitor, it is crucial to store the medication correctly. The FDA provides guidelines on proper storage conditions for medications, including keeping them in a cool, dry place away from moisture, heat, and direct sunlight[3]. Following these guidelines will help maintain the drug's stability and ensure its potency until the expiration date.

In conclusion, the shelf life of Lipitor does not vary by dosage strength. Regardless of the prescribed dosage, the medication has a shelf life of 36 months from the date of manufacture. It is essential to store Lipitor properly to maintain its effectiveness and safety until the expiration date.

Sources:
[1] DrugPatentWatch: Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Medical News Today: Lipitor (atorvastatin): Uses, dosage, side effects, and more. Retrieved from https://www.medicalnewstoday.com/articles/lipitor
[3] FDA: Medication Storage and Disposal. Retrieved from https://www.fda.gov/media/155050/download