LOUISVILLE, Ky. — A Kentucky-based health care company is suing to protect its name after being involuntarily drawn into the backlash over Rush Limbaugh’s derisive comments about a Georgetown law student.

Concentra Health Services filed today for a preliminary injunction to stop the Preval Group of Portland, Maine from using the name Concentra to market memory aid pills.

Louisville-based Humana, the parent company of Concentra Health, said in court filings it received angry phone calls, emails and web postings after an ad for Concentra pills aired on Limbaugh’s show Monday.

Concentra Health and the Preval Group are not related.

Limbaugh has been criticized for attacking Sandra Fluke over contraception. He apologized but has lost some advertisers in the backlash.

A message left for the Preval Group Thursday was not immediately returned.