Dr. Drew: We All Need to Pray for Jeff Conaway
05/21/2011 AT 10:15 PM EDT
The former Taxi actor, who was hospitalized earlier this week, is "not doing well today suddenly," Pinsky Tweeted Saturday evening. The doctor later described Conaway's state as "tenuous."
Pinksy – who previously worked to help Conaway with his addiction to cocaine, painkillers and alcohol on Celebrity Rehab – visited the actor Friday.
"Just visited Jeff Conaway. He is stable & looks like he will recover from his pneumonia," Pinsky wrote Friday evening. "Not an OD like press is alleging & certainly not dead."
However on Saturday, Pinsky said that Conaway, 60, had taken a turn for the worse. "[He is] still considered critical with #sepsis. Many people die from septic shock. yes, he is VERY tenuous," wrote Pinsky. "My hopes & prayers r with him & his family! … Yes, we all need to pray for him."
A rep for the actor tells PEOPLE that "the use of painkillers and prescription drugs" – not an overdose – led to Conaway being found unconscious in his home.
"In any event, there is some improvement," the rep added, "and we are hopeful at this time."