That source added that doctors also found opiates in the ex-NBA star's system and needle marks on one of his arms.
While he has been off the show since he split with Khloe in 2009, he is still a topic of conversation among the family members and Sunday's re-run episode involved a scene in which Khloe said she was worried Lamar would 'spiral' out of control.
The show takes place on the fictional Iron River Ranch in Garrison, Colorado, detailing the life of the Bennetts, a dysfunctional family consisting of two brothers, their rancher father, and his separated wife and local bar owner.
The Ranch has been met with mixed reviews from critics.
Lamar Odom is fighting for his life after a 'crack-cocaine and opiate-fueled' weekend at a Nevada brothel, with sources now saying that his collapse may have been sparked by the reality show Keeping up with the Kardashians.
Following news of former LA Laker's alleged overdose, his estranged wife Khloe Kardashian rushed to be by his side at Sunrise Hospital in Las Vegas.
The site's critical consensus reads, "A formulaic set-up and predictable plotting are elevated by The Ranch's surprising sensitivity and strong performances." Netflix users have rated The Ranch 4.5/5 stars and IMDB users have rated it 7.5/10 stars.Odom is reportedly on life support in a coma, with his heart, lungs and kidneys failing.