The development of allergies to Lipitor, also known as atorvastatin, can vary from person to person. According to the sources provided, there is no specific timeline mentioned for the development of allergies to this medication. Allergic reactions can occur at any time during the course of treatment, and they may vary in severity.

Lipitor is a medication commonly prescribed to lower cholesterol levels and reduce the risk of heart-related conditions. Like any medication, it can cause side effects, including allergic reactions. The National Health Service (NHS) states that allergic reactions to atorvastatin are rare but can occur. These reactions can manifest as skin rashes, itching, swelling, or difficulty breathing [2].

The Medical News Today article also mentions that allergic reactions to Lipitor can occur, although they are uncommon. It advises individuals to seek immediate medical attention if they experience symptoms such as hives, swelling of the face or throat, or difficulty breathing, as these could indicate a severe allergic reaction [3].

It is important to note that everyone's body reacts differently to medications, and individual responses can vary. Allergic reactions can occur shortly after starting Lipitor or after long-term use. It is crucial to consult a healthcare professional if you suspect you may be experiencing an allergic reaction to Lipitor or any other medication.

In summary, the development of allergies to Lipitor can occur at any time during treatment. Allergic reactions to atorvastatin are rare, but they can manifest as skin rashes, itching, swelling, or difficulty breathing. If you experience any symptoms of an allergic reaction, it is important to seek immediate medical attention [2][3].

Sources:
[2] NHS - Side effects of atorvastatin: https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] Medical News Today - Lipitor (atorvastatin): Side effects, dosage, uses, and more: https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects