The US Food and Drug Administration (FDA) on Friday announced that Indian drugmaker Hetero Labs is recalling 87 lots of losartan tablets distributed by Camber Pharmaceuticals after testing found the drugs contained a potentially carcinogenic impurity, N-Nitroso-N-methyl-4 aminobutyric acid (NMBA).   The recall is the latest in a series of recalls tied to the discovery of nitrosamine impurities in angiotensin II receptor blocker (ARB) drugs in the last year.   Previ...