Synthetic opioids, primarily illicitly manufactured fentanyl, cause more overdose deaths than any other drug in the United States. In 2023, roughly 105,000 people died from drug overdoses, and about 76% of those deaths involved opioids. Fentanyl and its chemical cousins have dominated overdose statistics since 2013, when they overtook heroin and prescription painkillers as the leading killer.
Why Fentanyl Leads All Other Drugs
Fentanyl is roughly 100 times more potent than morphine. As little as two milligrams, a quantity small enough to fit on the tip of a pencil, can be lethal depending on a person’s body size and tolerance. That extreme potency makes dosing wildly unpredictable, especially when fentanyl is pressed into counterfeit pills or mixed into heroin, cocaine, or methamphetamine without the user’s knowledge.
The CDC tracks overdose deaths by drug category, and synthetic opioids other than methadone (the category that captures fentanyl) consistently top every other class. In 2023, the age-adjusted death rate for synthetic opioids was 22.2 per 100,000 people. For comparison, cocaine killed at a rate of 8.6 per 100,000 and methamphetamine at 10.6 per 100,000 that same year. Heroin, once the face of the overdose crisis, had fallen to just 1.2 per 100,000.
The Numbers Are Falling, but Still Enormous
Between 2023 and 2024, synthetic opioid overdose deaths dropped by 35.6%, the steepest decline of any drug category. The death rate fell from 22.2 to 14.3 per 100,000. Cocaine deaths dropped 26.7%, methamphetamine deaths dropped 19.8%, and heroin deaths fell 33.3%. By late 2025, provisional data put total U.S. drug overdose deaths at roughly 70,000 for the year, a meaningful decline from the 105,000 recorded in 2023.
These drops are significant but need context. Even at the reduced 2024 rate, synthetic opioids still killed at more than double the rate of the next-closest drug. And provisional counts are adjusted upward as delayed death certificates come in, so final numbers tend to be higher than early estimates.
Most Overdoses Involve More Than One Drug
A single overdose death often involves multiple substances, which complicates the picture. Among deaths involving illicitly manufactured fentanyl between January 2021 and June 2022, nearly a third (30.9%) also involved cocaine. About one in five (21.9%) involved methamphetamine. Alcohol appeared in 17.9% of fentanyl deaths, heroin in 12.4%, prescription opioids in 11.8%, and benzodiazepines in 11.5%.
This polysubstance pattern means that many cocaine or methamphetamine deaths are really fentanyl deaths in disguise. Someone using cocaine may not know the supply contains fentanyl, and their body has no opioid tolerance to buffer the effect. The same risk applies to counterfeit pills sold as prescription medications.
Xylazine Adds a New Layer of Danger
An animal tranquilizer called xylazine has increasingly appeared in the fentanyl supply. Among fentanyl-involved deaths across 32 jurisdictions, xylazine was detected in 9% of cases during January 2021 through June 2022. That number had been climbing fast: the percentage of fentanyl deaths with xylazine present rose 276% between January 2019 and June 2022.
Xylazine is not an opioid, so naloxone (the standard overdose reversal medication) does not counteract it. When both substances are present, reversing the overdose becomes harder. Emergency medical services in Kentucky found that the average naloxone dose administered during suspected opioid overdoses increased from 4.5 mg to 4.7 mg between 2018 and 2021 as fentanyl became more prevalent. In fatal cases, paramedics administered an average of 5.9 mg, compared to 4.6 mg in cases where the person survived.
Three Waves of the Opioid Crisis
The current crisis arrived in stages. The first wave began in the 1990s with a surge in prescription painkiller use. The second wave started around 2010 as heroin became cheaper and more available, partly fueled by people who had first become dependent on prescription opioids. The third wave, beginning in 2013, brought illicitly manufactured fentanyl and its analogs into the drug supply at scale. Each wave built on the last, and fentanyl’s dominance has reshaped the entire landscape of drug-related death in the U.S.
Prescription opioid deaths, while still occurring, have declined substantially. The death rate for natural and semisynthetic opioids (the category covering drugs like oxycodone and hydrocodone) fell 20.7% from 2023 to 2024, dropping from 2.9 to 2.3 per 100,000. That rate is now a fraction of the synthetic opioid death rate, reflecting how thoroughly illicit fentanyl has displaced prescription drugs as the primary threat.
Who Is Most Affected
Adults aged 35 to 44 have the highest overdose death rate of any age group. In 2023, that rate was 60.8 per 100,000, followed closely by people aged 45 to 54 at 53.3 and those 55 to 64 at 49.2. The youngest adults (15 to 24) and oldest adults (65 and older) have the lowest rates, though overdose deaths among people 65 and older actually increased from 2022 to 2023 while declining in every younger age group.
Racial disparities are stark. American Indian and Alaska Native people face the highest age-adjusted overdose death rate at 65.0 per 100,000, nearly double the rate for Black Americans (48.9) and roughly 12 times the rate for Asian Americans (5.1). Between 2022 and 2023, overdose death rates rose among Black Americans and Native Hawaiian or Other Pacific Islander populations, while rates declined for white Americans.
Non-Fatal Overdoses by the Numbers
Fatal overdoses represent only part of the picture. In 2024, emergency departments across 34 participating states recorded roughly 245,000 visits for non-fatal drug overdoses, a rate of about 112.5 per 100,000 people. Many of these visits involve the same drugs that drive fatal overdoses, particularly fentanyl and other synthetic opioids, though the CDC’s non-fatal tracking system does not break down figures by specific substance in the same way mortality data does.