The event was organised as part of the third anniversary of the state's formation.
Srihari after taking salute of the parade held at the police parade grounds suddenly collapsed on the dais while giving the speech, but the security personnel standing behind him rushed to his help and prevented him from falling on the floor.
"At around 9.35 AM, the Deputy CM who was delivering speech felt some giddiness and collapsed. As he was about to fall, I and other police officials rushed towards him and he fell on my arms," said Warangal Police Commissioner G Sudheer Babu, who shared the stage with Srihari.
The Deputy CM later left for his home and after relaxing for about one hour, he took part in events organised in different parts of Warangal.
A team of doctors conducted his medical examination and a report is expected by tomorrow, the senior police officer said, adding he was doing fine.