Here's what happens if you take the drug Bill Cosby said he obtained for sex

Bill Cosby has admitted he obtained drugs to give to women he wanted to have sex with during the 1960s and '70s. He's been accused of - but hasn't admitted to - sexual assault and rape.

When all of this was happening, so-called "date rape" drugs didn't exist yet. There were no "roofies," (slang for Rohypnol), no "easy lay," (slang for GHB, or gamma hydroxybutyric acid), no Ketamine.

Yet Cosby admitted to getting seven prescriptions from a Los Angeles doctor for quaaludes, lab-produced pills that act to suppress the central nervous system, which slows heart rate and can make users feel relaxed or sedated.

The drugs, which soared in popularity in the '70s, were taken off the market in the US in 1983 because they were linked with a high risk of abuse.

Quaadludes' effects - which can include sleepiness and a sense of euphoria - are strikingly similar to that of modern date rape drugs, including alcohol. (Booze is "the drug most commonly used to help commit sexual assault," according to the US Department of Health.)

A brief history of quaaludes

Quaaludes, or methaqualone, were first produced in labs in India in 1955; the scientists who made the drug were trying to find a malaria cure. While it was ineffective against the disease, it appeared to work as a sedative. After it was patented in 1962, doctors in the UK began prescribing it to patients who had trouble sleeping; it started being widely used in the US in the '70s.

As early as the late 1960s, people at dance clubs were using quaaludes, known then as "disco biscuits." By the '80s, they were outlawed.

Quaaludes and the brain

Like other drugs, quaaludes affect our brain chemistry by altering the levels of neurotransmitters, the chemical messengers that pass along the signals that control our thinking and behavior.

Quaaludes are a sedative, which work in the brain by halting the functioning of our "excitatory" messengers, the ones that typically increase our energy levels, and boosting the activity of our "inhibitory" messengers, those that usually work to calm things down.

Jordan Belfort, the real-life person on which the film "The Wolf of Wall Street" was based, described his experience with the drug in his autobiography:

"All at once a warm feeling came rising up my brain stem, as a pleasant tingling sensation went ricocheting through every molecule of my body. The phone receiver was still at my ear and I wanted to tell Bo to have Rocco come pick me up at the Brookville Country Club, but I couldn't get my lips to move. It was as if my brain was sending out signals but they were being intercepted - or scrambled. I felt paralyzed. And I felt wonderful. I stared at the shiny metal face of the pay phone and cocked my head to the side, trying to find my own reflection…How pretty the phone looked!…So shiny it was!"

The key important inhibitory messenger that quaaludes act on is GABA, short for gamma-aminobutyric acid.

This action is why quaaludes make us drowsy and slow down our heart rate and breathing. It's also one of the reasons they're so dangerous - a quaalude overdose can result in coma or even death.