Haleon is recalling Robitussin cough syrup sold nationwide due to microbial contamination that could lead to deadly infections for at-risk people, the U.S.-based unit of the U.K.-based global consumer health company said on Wednesday.

Use of the recalled products could potentially result in severe or life-threatening fungal infections in those with impaired immune systems, Haleon stated in a notice posted by the Food and Drug Administration. Most users are unlikely to experience a serious health problem, but an infection that requiring medical intervention can’t be ruled out, the company said.