Lamar Odom is fighting for his life after falling into unconsciousness at Dennis Hof's Love Ranch South in Pahrump, Nevada ... TMZ Sports reports.
Sources at the Love Ranch tell us ... 35-year-old Odom arrived at the Ranch Saturday and was partying with the girls for days. A source at the Ranch said Lamar was taking an herbal substitute for Viagra.
We spoke with Hof ... who tells us Tuesday afternoon, a woman went into Odom's room in the VIP suites and found him unconscious.
We're told the woman began screaming for the manager -- who called 911.
The manager rolled Lamar over on his side and saw "mucus-type liquid coming out of his nose and mouth."
An ambulance took Lamar to Pahrump hospital, where doctors intubated him ... an indication he could not breathe on his own.
We're told Lamar is being airlifted from the hospital to Las Vegas for more treatment.
Our sources tell us, "It's not good."
We're told Lamar had been partying at the ranch by himself -- with no friends or entourage -- and is now alone at the hospital.
The ranch staff says they want to be in the room with Lamar but since they're not family they're not allowed.
One hour after Lamar Odom was found unconscious in a Nevada brothel ... paramedics were fighting to save his life during a critical ambulance ride.
TMZ obtained video of the Pahrump Valley Fire and Rescue vehicle that raced the ex-NBA star to Desert View hospital. You can see paramedics still working on Odom as they arrived at the hospital around 4:16 PM on Tuesday.
According to the Nye County Sheriff the fire department arrived at 3:34 PM to the Love Ranch South where, as TMZ first reported, Odom was found unconscious with liquid coming out of his nose and mouth.
Odom was eventually transported by another ambulance to Sunrise Hospital in Las Vegas, where he is unconscious and on a respirator. Sources close to the situation tell us some of his organs are failing and he's listed in critical condition as of late Tuesday night.
We're told Khloe Kardashian is by his side. She flew to LV Tuesday night with Kim Kardashian and Kris Jenner.