Yes, certain painkillers can produce a high, but only those that act on the brain’s opioid receptors. Prescription opioids like oxycodone, hydrocodone, morphine, codeine, and fentanyl all have the potential to create euphoria. Over-the-counter painkillers like ibuprofen and acetaminophen do not.
The difference comes down to brain chemistry. Understanding which painkillers carry this risk, how quickly the body adapts, and where euphoria tips into danger can help you make sense of what’s actually happening in the body when someone misuses these drugs.
Which Painkillers Produce Euphoria
Only opioid painkillers can produce a high. The most commonly prescribed ones include hydrocodone (sold as Vicodin), oxycodone (OxyContin, Percocet), oxymorphone, morphine, codeine, and fentanyl. These medications are prescribed for moderate to severe pain, and they all share the same basic mechanism: they bind to specific receptors in the brain that regulate both pain and pleasure.
Over-the-counter painkillers work completely differently. Ibuprofen, aspirin, and acetaminophen reduce pain by blocking the production of inflammatory chemicals called prostaglandins. They don’t interact with the brain’s reward circuitry at all, which means they cannot produce euphoria no matter how much you take. Taking more than the recommended dose of these drugs won’t get you high. It will damage your organs.
How Opioids Create a High
Opioid painkillers produce euphoria by activating what are called mu opioid receptors in the brain’s reward system. When these receptors are stimulated, they trigger a surge of pleasurable feelings in a region called the nucleus accumbens, which is the same area involved in the enjoyment of food, sex, and other natural rewards. Activating mu receptors in this area amplifies both the “liking” (the pleasurable sensation itself) and the “wanting” (the drive to seek that sensation again).
This is what makes opioid misuse so reinforcing. The brain interprets the signal as intensely positive, creating a feedback loop. The reward system essentially learns that the drug is worth pursuing, which is the same pathway that drives addiction to other substances. Taking opioids at higher doses than prescribed, crushing extended-release tablets, or using someone else’s prescription all amplify this effect and dramatically increase the risk of dependence.
What Being High on Opioids Looks Like
The physical signs of opioid intoxication are distinct. The most recognizable is pinpoint pupils, where the pupil constricts to a very small size regardless of lighting. A person who is high on opioids will also have a noticeably slow pulse, slurred speech, and may appear extremely drowsy or “nod off” mid-conversation. Their breathing often becomes shallow and slow.
Internally, the person feels a wave of warmth, relaxation, and sometimes intense contentment. Pain signals are muted, anxiety drops, and the body feels heavy and loose. This combination of physical sedation and emotional euphoria is what drives people to misuse these drugs, but the pleasant effects come packaged with serious physiological suppression that can turn fatal.
The Body Builds Tolerance Fast
One of the most dangerous features of opioid use is how quickly the body adapts. Tolerance, meaning the same dose produces a weaker effect, can begin developing after a single exposure. In animal studies, measurable tolerance has been documented after just one injection. In clinical settings, patients managing chronic pain sometimes require dose increases of more than tenfold over time.
This matters enormously for someone chasing a high. The euphoric effects fade faster than the pain-relieving effects, which pushes people to escalate their dose. But while the brain’s pleasure response is dulling, the body’s vulnerability to respiratory depression (the mechanism that kills in an overdose) doesn’t build tolerance at the same rate. So a person taking increasingly large doses to feel high is steadily narrowing the gap between the dose that produces euphoria and the dose that stops their breathing.
Where Euphoria Becomes an Overdose
Opioid overdose kills by suppressing the brain’s drive to breathe. At therapeutic doses, this effect is mild. At higher doses, breathing can slow to the point where the body doesn’t get enough oxygen, leading to brain damage or death. There is no safe “recreational” dose of prescription opioids, because the margin between a high and a medical emergency varies based on a person’s weight, tolerance, genetics, and what other substances are in their system.
Fentanyl illustrates this danger starkly. In hospitalized overdose patients, blood levels of fentanyl have been measured at up to three times the highest concentration used for medical pain relief. Among those who died, levels were nearly four times the maximum therapeutic dose. Because fentanyl is far more potent than other opioids by weight, even a tiny miscalculation in dosing can be lethal.
Mixing opioids with alcohol, benzodiazepines (anti-anxiety medications), or sleep aids compounds this risk. All of these substances suppress breathing independently, and combining them multiplies the effect.
Hidden Danger in Combination Pills
Many prescription opioids come combined with acetaminophen. Vicodin and Percocet both contain it. Someone taking extra pills to chase a stronger high isn’t just increasing their opioid dose. They’re also flooding their liver with acetaminophen.
In adults, a single ingestion of 7.5 to 10 grams of acetaminophen poses a significant risk of severe liver damage. Anything above 12 grams is considered highly toxic. For context, each Vicodin tablet typically contains 300 to 325 milligrams of acetaminophen. Taking a large handful to intensify an opioid high can easily push someone into the range of acute liver failure, a medical emergency that can require a transplant or prove fatal on its own, completely separate from the opioid risk.
Long-Term Effects of Misuse
Beyond the immediate risks, sustained opioid misuse reshapes the body in ways that persist long after the high fades. Chronic use can cause cardiovascular problems including dangerously low blood pressure, slowed heart rate, and in severe cases, heart failure. The immune system weakens, leaving people more vulnerable to infections. People who inject opioids face additional risks: hepatitis C, HIV, and bacterial infections of the heart’s inner lining.
Perhaps the cruelest long-term effect is a phenomenon called opioid-induced hyperalgesia. With prolonged use, especially at high doses, the nervous system actually becomes more sensitive to pain. The very drug a person started taking to feel less pain can, over time, make their baseline pain worse. This creates a vicious cycle where someone needs the drug just to manage pain their body wouldn’t have produced without the drug in the first place.
Depression, sexual dysfunction, chronic constipation, and sleep disruption are also common with long-term opioid use. Opioid use disorder itself is classified as a chronic medical condition, meaning the brain changes involved in addiction are lasting and require sustained treatment to manage, though effective treatments do exist.