Based on the information available, it is recommended that you inform your doctor about experiencing lightheadedness while taking Lipitor. Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol and prevent heart disease [1].

While Lipitor is generally well-tolerated, it can cause side effects, and lightheadedness is one of them [1]. In some cases, lightheadedness may be a sign of a more serious issue, such as a severe allergic reaction or low blood pressure [2]. Therefore, it is important to inform your healthcare provider about any new or worsening symptoms you experience while taking Lipitor.

Additionally, it is worth noting that Lipitor has several patent expirations, with the latest one in 2022 [3]. This means that generic versions of the drug will become available, which could affect your treatment plan.

In summary, informing your doctor about experiencing lightheadedness while taking Lipitor is recommended. It is crucial to keep your healthcare provider informed about any side effects or changes in your health while taking medication.

Sources:

1. "Lipitor" Mayo Clinic. <https://www.mayoclinic.org/drugs-supplements/lipitor-oral-route/side-effects/drg-20064551>.
2. "Dizziness: First Aid" Mayo Clinic. <https://www.mayoclinic.org/first-aid/first-aid-dizziness/basics/art-20056681>.
3. "Lipitor (Atorvastatin Calcium) Drug Patent Expiration Dates" DrugPatentWatch. <https://www.drugpatentwatch.com/drugs/lipitor>.