India.

Trial name or title	Phase IV controlled trial to investigate further the impact of low osmolarity ORS on the incidence and prevalence of hyponatraemia in diarrhoeic patients, especially those with cholera (Study ID: NCT00490932).
Methods	Surveillance study.
Participants	About 20,000 patients (adults and children) with diarrhoea (non‐cholera and cholera).
Interventions	(1) ORS ≤ 270. (2) ORS ≥ 310.
Outcomes	Not known.
Starting date	Not known.
Contact information	Awaiting details.
Notes	Location: Calcutta, India. Awaiting details. Study ID: NCT00490932.

ORS: oral rehydration solution