The maker of Hyland's teething tablets has issued a recall for any remaining packages at the urging of U.S. regulators, who say the medicine has inconsistent levels of a herb that can be poisonous.

Standard Homeopathic Co. of Los Angeles, stopped making and shipping the tablets last October. It said it's notifying distributors and stores to return any leftover products, while consumers should throw them out.

The recall announced late Thursday covers Hyland's Baby Teething Tablets and Hyland's Baby Nighttime Teething Tablets, meant to relieve gum discomfort from emerging teeth.

The Food and Dru...