Bayer Healthcare is recalling 100,000 packages of Alka-Seltzer cold capsules because some do not properly display warning information about drowsiness.

The German conglomerate said Tuesday the issue affects less than 4 percent of packages from a single lot of Alka Seltzer Plus Day & Night Liquid Gels.

Information about the risk of drowsiness does not appear on all packaging for the night time capsules. The night formula includes an antihistamine to help users get to sleep.

Company spokeswoman Tricia McKernan says the problem was caused by human error during the printing process. The Alka Seltzer day and night formula was distributed to supermarkets

Consumers who purchased packages from lot 296939L can contact Bayer for a refund at (800) 986-3307.