Dr. Drew: We All Need to Pray for Jeff Conaway

05/21/2011 at 10:15 PM EDT

Jeff Conaway 'Not Doing Well,' Says Dr. Drew
Jeff Conaway
Kathy Hutchins/Hutchins Photo
Jeff Conaway needs all the help and well-wishes he can get, according to Dr. Drew Pinsky.

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."

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