What's in the 'Herbal Viagra' Lamar Odom Took?

This story was updated at 12:40 p.m. ET on Monday (Oct. 19).

Former NBA championship winner and reality TV star Lamar Odom awoke from a coma on Friday (Oct. 16) after he was found unconscious earlier in the week at the Love Ranch brothel in Nevada. Odom took a diet supplement touted as "herbal Viagra" before falling unconscious, and while it isn't clear exactly what happened to the 35-year-old athlete, federal agencies and researchers have warned that such supplements may contain hidden drug ingredients, and cause severe side effects.

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Hof also told The Washington Post that Odom had purchased a supplement called "Reload" from the brothel store. A spokesperson for the Love Ranch said that Odom had purchased another "performance-enhancing" supplement called Libimax Plus from the brothel's shop, as well, according to a report by the Associated Press. In total, Odom is believed to have consumed about 10 "herbal Viagra" supplements during his three-day stay at the ranch.

In 2009, the manufacturer of Libimax voluntarily recalled the product after a lab test conducted by the FDA found that the supplement, labeled as "all natural," contained the drug tadalafil, which is one of the active ingredients in the FDA-approved, erectile dysfunction drug Cialis. The FDA issued a similar warning regarding a manufacturer's recall of Reload in 2013, after lab tests confirmed this supplement contained sildenafil, the active ingredient in Viagra.

However, because this blood vessel relaxation also lowers blood pressure, the drugs can cause serious complications. For example, people taking medications containing nitrates, which are used to treat conditions like high blood pressure or heart disease, can experience dangerously low blood pressure levels after taking erectile dysfunction drugs, according to the FDA. Nitrates also dilate blood vessels to allow blood to flow more easily.

"These products either do not work, or if they do work, are potentially harmful," because they contain undisclosed drugs, Dr. Pieter Cohen, an assistant professor of medicine at Harvard Medical School and a general internist at Cambridge Health Alliance in Boston told Live Science in 2013. Although the FDA warns the public about recalls on herbal supplements, the agency does not fully control the distribution of these potentially harmful substances.

In fact, some herbal supplements recalled by the FDA have remained on store shelves long after they've been recalled, and many of those supplements still contained the hidden drugs that got them recalled in the first place, according to a 2014 study published in the Journal of the American Medical Association. In the study, researchers purchased 27 dietary supplements (including "sexual enhancement" supplements) that had been recalled by the FDA because of hidden pharmaceutical ingredients. On average, the drugs were purchased three years after they'd been recalled.

One of the ingredients sometimes found in herbal libido supplements is yohimbine, an extract created from the bark of the evergreen tree Pausinystalia johimbe of central Africa. The ingredient is used as an aphrodisiac in traditional medicines, but there have not been clinical studies demonstrating the efficacy of the extract for improving low libido or erectile dysfunction, according to Cohen, who published a paper on yohimbine in the journal Drug Testing and Analysis in September 2015.

The side effects of yohimbine are quite different from those of the pharmaceuticals tadalafil and sildenafil and include hypertension and panic attacks, Cohen said. But high doses of the substance might have a more serious effect, he added. Losing consciousness is not a side effect typically associated with taking yohimbine, but Cohen noted that when the extract (plus whatever other drugs may be in a libido supplement) are combined with other substances (like alcohol, opiates or amphetamines) it's possible that loss of consciousness might occur.