The legislator was discharged last night from the hospital after his clinical parameters were found to be normal and was brought back to the jail amid tight security, Jailor Viveksheel Tripathy said.
The 55-year-old MLA from Mau, who was lodged in Banda jail in connection with various criminal cases, had suffered a heart attack while he was meeting his wife in the prison.
The MLA has been in various jails in the state since 2015 under various charges.
In Lucknow, his brother and former MP Afzal Ansari in a press conference alleged that Mukhtar Ansari was not given proper treatment because of "pressure" from the government.
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"Sanjay Gandhi PGI (Lucknow) had said that Mukhtar Ansari will be kept under 72-hour observation, but he was discharged within 40 hours. I have proof that under pressure of the government machinery, my brother was shifted back to the Banda jail," Afzal Ansari said.
"Mukhtar should be kept in Mau, Ghazipur, Lucknow or Agra jails where his cases are going on or in a jail where he can get medical aid during any emergency," he said.