The U.S. opioid crisis rages on. 

President Trump on Thursday declared the country's opioid crisis a national emergency. "The opioid crisis is an emergency, and I'm saying officially right now it is an emergency. It's a national emergency. We're going to spend a lot of time, a lot of effort and a lot of money on the opioid crisis," Trump told reporters at his golf club in Bedminster, N.J.

Goldman Sachs explained in a note in July that while the opioid epidemic in the United States has contributed to a decline of prime-age participation in the workforce, illicit drug use has not significantly increased. Therefore, the analysts suggested the unemployment does not overstate the employment stock.

"It is tempting to assume that drug abuse must also be a rising barrier to work for the remaining pool of unemployed workers," the researchers wrote. "The [Federal Reserve's] May Beige Book offered a hint in this direction, noting that several contacts reported that job applicants were unable to pass drug tests. In fact, however, we see drug problems as at most a modestly larger barrier to employment for unemployed workers."

Although age-adjusted drug deaths tripled since 2000, the analysts noted illicit drug use has not increased so dramatically, only a few percentage points since 2002. Illicit drug use among unemployed individuals even decreased between 2002 and 2015, and it increased less than two percentage points since the Great Recession. The analysts also noted that while positive pre-employment drug tests have increased, the rise in presence of opioids has been "very small."

In reviewing the increase of the opioid-related deaths following the Great Recession that began in 2008, the analysts also determined that while the economic decline worsened the epidemic, other factors were likely more important since the crisis began before the downturn.

"The recession likely made it worse, but the relationship between the economy and the opioid epidemic is more complex," the analysts wrote.

Nearly 100 Americans die from opioid abuse every day, and there are about as many opioid prescriptions written in the United States every year as there are adults in the country. That results in the country consuming 80% of the world's opioids, despite having just 5% of its population. The National Survey of Drug Use and Health found that almost 13% of Americans on prescription pain relievers misused them in 2015.

Drugmakers have developed medications to treat opioid dependencies and overdose. Here are some of them.

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