Question category: Gastroenterology
A 20 year old goes back packing through India. On his return he develops a diarrhoeal illness which is very watery and he is moving his bowels twenty times a day. It is associated with abdominal cramps. He had a vasovagal episode due to dehydration and presents to A and E. A stool sample is taken for culture and appears like rice water. If a stool culture confirms vibrio cholera as suspected, what is the most appropriate antibiotic to use?