During an allergic reaction, histamines bind to receptors along the blood vessels, making them expand and become more permeable so white blood cells can attack the pathogen. Antihistamines block this mechanism, in effect narrowing the blood vessels.Jul 1, 2014
According to the June 26, 2019, US Food and Drug Administration (FDA) Enforcement Report, P & L Developments initiated the recall after learning of a recall issued by its supplier over potential Burkholderia cepacia (B. cepacia) and Ralstonia pickettii (R. pickettii) contamination.