When Hitler developed jaundice in September 1944, Dr. Erwin Geising – an ear, nose and throat specialist who had originally been brought in to treat the dictator after the damage done to his eardrums from the bomb explosion of the 20 July plot – began to be suspicious of Morell's treatment of Hitler. Suspecting that he knew the cause of the jaundice, Geising deliberately dosed himself with some of the "Dr. Koester's Anti-Gas Pills" which Morell had Hitler taking in large numbers every day, and found that they had effects that were mildly harmful. Having them analyzed, he found they contained strychnine and belladonna, the strychnine being the cause of the jaundice.