Union Agriculture Minister Sharad Pawar fainted in the Lok Sabha on Tuesday.
He was taken to Ram Manohar Lohia (RML) Hospital where he is stated to be stable, said his close aide.
Pawar, 71, was leaving the house when he collapsed.
"He was rushed to RML he is said to be stable," he said.
The Nationalist Congress Party (NCP) chief was in Mumbai last evening and returned to the capital late Monday.
Pawar, 71, was taken away in an official car from the Parliament premises accompanied by his daughter and Baramati MP Supriya Sule and Union minister Praful Patel.
"Pawar complained of dizziness," minister of state in the PMO V Narayanasamy said.
Pawar had answered a number of supplementaries on questions related to agriculture during the Question Hour in the Lok Sabha.
(With inputs from PTI, IANS)