They said Muthupandi was running a clinic at Tenkasi for diabetes and blood pressure patients. He also used to visit patients at nearby Azhagapuram village.
Today he visited the village, but people there expressed doubts about the efficacy of his concoction. To clear their doubts, the doctor first drank it himself and then gave it to four patients, police said.
Muthupandi and three others died en route to the hospital, while the other patient was hospitalised and is reportedly in a critical condition, police said.
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