According to the sources provided, there are no known interactions between doxycycline and Lipitor. DrugPatentWatch [1] lists doxycycline as a generic drug, and it does not indicate any interactions with Lipitor. Drugs.com [2] also confirms that there are no known interactions between doxycycline and Lipitor. Additionally, GoodRx [3] provides a list of potential drug interactions for doxycycline hyclate, but Lipitor is not listed as one of the drugs that may interact with doxycycline.

It is important to note that while there are no known interactions between these two drugs, it is always advisable to consult with a healthcare professional before taking any new medication or changing your current medication regimen. They can provide personalized advice and recommendations based on your specific medical history and current medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/DOXYCYCLINE
[2] https://www.drugs.com/drug-interactions/doxycycline-with-lipitor-940-0-276-128.html
[3] https://www.goodrx.com/doxycycline-hyclate/interactions