[Acute arsenic poisoning].

We report three cases of arsenic poisoning in a chemical factory. Three workers were exposed to vinyzene 10,10'-oxydephenarsine and developed mild symptoms of acute poisoning. All patients were treated with dimercaprol, and recovered after a few days. Urine analysis did not show increased arsenic excretion, but this could be due to the large urine samples taken. It is recommended that a urine sample is taken right after admission to hospital and new samples after eight and 16 hours.