The head of GetUp!, Simon Sheikh, collapsed on live television last night.
The political lobby group's national director was carried offstage less than halfway through the ABC's Q&A, on which he was a panellist.
He appeared to try to take a drink of water before leaning forward and collapsing onto the desk. He was later taken to hospital by ambulance.
Simon Shiekh's collapse on live TV, and the Q&A panel's reaction.
A Coalition frontbencher, Sophie Mirabella, who was sitting next to him, appeared to first notice Sheikh collapse.
The Climate Change Minister, Greg Combet, who was speaking when the incident occurred, joined the show's production crew to rush to his side.
''He's not OK,'' Mr Combet said.
Sheikh was said to be alert, conscious and talking with his wife, Anna Rose, who was in the audience before being taken to hospital to be checked.
''Sorry, I passed out,'' he said before he was led off-screen.
A GetUp! spokesman said Sheikh has had a ''busy workload'', with the political organisation involved in a number of campaigns.