HUNTSVILLE, Ala. (AP) — Qualitest Pharmaceuticals is recalling multiple lots of birth-control pills because of a packaging error that could lead to incorrect dosing and unintended pregnancies.

The company says the error caused the weekly tablet orientation to be reversed and obscuring the lot number and expiration date on certain packages.

Read: List of affected lots (.pdf)

The problem could lead to inadequate contraception if women don’t get the proper daily regimen of the drug.

The recall affects certain lots of Cyclafem, Emoquette, Gildess, Orsythia, Previfem and Tri-Previfem.

Doctors, pharmacists and patients seeking more information can contact Qualitest at 1-877-300-6153.

Qualitest Pharmaceuticals is a unit of Endo Pharmaceuticals Holdings Inc.

(Copyright 2011 by The Associated Press. All Rights Reserved.)