Kratom is a plant-based substance made from the leaves of a tropical tree (Mitragyna speciosa) native to Thailand, Malaysia, Myanmar, and other parts of Southeast Asia. It belongs to the same botanical family as coffee, but its effects are far more potent and complex. At low doses it acts as a stimulant, boosting energy and alertness. At higher doses it behaves more like an opioid, producing sedation and pain relief. This dual nature is central to both its appeal and its risks.
How Kratom Works in the Body
Kratom’s effects come primarily from two alkaloids found in its leaves: mitragynine and 7-hydroxymitragynine. These compounds bind to the same receptors in the brain that prescription opioids and heroin target, known as mu-opioid receptors. Mitragynine has a strong preference for these receptors, binding to them roughly 10 times more readily than it does to the brain’s other opioid receptor types. That selectivity explains why kratom can produce effects that feel similar to opioid painkillers: pain relief, a sense of calm, and in larger amounts, significant sedation.
What makes kratom unusual is that it isn’t simply an opioid. At smaller amounts, the stimulant properties dominate. Users report increased energy, sharper focus, and improved mood, effects more reminiscent of a strong cup of coffee than a narcotic. As the dose climbs, the opioid-like qualities take over. Above roughly 8 grams of powdered leaf, side effects like dry mouth, sweating, sedation, and a rapid heartbeat become common.
Common Forms and How People Use It
In Southeast Asia, kratom leaves have been chewed raw or brewed into tea for centuries, traditionally by manual laborers seeking energy or relief from aches. In the United States and Europe, kratom is most often sold as a dried powder, capsules, or concentrated extracts. People brew the powder into tea, mix it into drinks, or swallow capsules. Some products are marketed as “enhanced” extracts with higher concentrations of the active alkaloids, which raises the risk of stronger and less predictable effects.
People turn to kratom for a variety of reasons. Some use it to manage chronic pain. Others use it to self-treat opioid withdrawal, hoping to ease the transition off prescription painkillers or heroin. Still others take it recreationally for the mood boost or mild euphoria it can produce. None of these uses have been evaluated or approved by the FDA, and no kratom-containing products are approved as medicines in the United States.
Health Risks and Side Effects
The FDA has warned consumers not to use kratom because of the risk of serious adverse events, including liver toxicity, seizures, and substance use disorder. Because kratom’s active compounds behave like opioids in the brain, they can produce classic opioid side effects: nausea, vomiting, constipation, physical dependence, and respiratory depression. Respiratory depression, a dangerous slowing of breathing, is the primary cause of death in opioid overdoses, and kratom can contribute to this risk.
Liver damage is another documented concern. Some users develop signs of liver injury, including jaundice and abnormal liver function, that resolve after they stop taking kratom but can be serious while they persist. The risk appears to increase with regular, high-dose use, though it has also been reported in people using moderate amounts.
Dangerous Drug Interactions
One of kratom’s less well-known risks involves how it interacts with other medications. Kratom’s alkaloids are strong inhibitors of two liver enzymes responsible for breaking down more than half of all marketed drugs. When these enzymes are blocked, medications that rely on them for processing can build up to dangerous levels in the bloodstream.
The drugs most affected include many common opioids, benzodiazepines (often prescribed for anxiety or sleep), and several antidepressants. If someone takes kratom alongside any of these medications, the combination can amplify side effects dramatically. With opioids in particular, the result can be life-threatening respiratory depression. This is especially concerning because some of the people drawn to kratom are the same people likely to be taking, or recently stopping, prescription opioids.
Dependence and Withdrawal
Regular kratom use can lead to physical dependence, meaning the body adapts to its presence and reacts when it’s removed. Withdrawal symptoms generally appear within 12 to 48 hours after the last dose and typically last one to three days, though some people experience them for up to a week.
Physical symptoms include nausea, vomiting, diarrhea, abdominal cramping, sweating, hot flashes, runny nose, watery eyes, tremors, jerky limb movements, disturbed sleep, and loss of appetite. The psychological side can be just as difficult: cravings, restlessness, irritability, nervousness, tension, and depressed mood. The overall experience resembles a moderate opioid withdrawal, which makes sense given how kratom acts on the same brain receptors.
The severity of withdrawal generally tracks with how much someone has been using and for how long. People taking large daily doses for months or years tend to have a harder time stopping than occasional, low-dose users.
Legal Status in the United States
Kratom occupies an unusual legal gray area. At the federal level, it is not a controlled substance. The DEA has listed it as a “Drug and Chemical of Concern” but has not moved to schedule it under the Controlled Substances Act. The FDA has approved no drug products containing kratom or its alkaloids and considers kratom an unapproved new dietary ingredient that cannot legally be marketed as a dietary supplement or food additive.
State and local laws vary widely. Several states have banned kratom outright, while others have passed consumer protection laws that regulate its sale, requiring age verification and product labeling. In states without specific laws, kratom is generally available for purchase in smoke shops, specialty stores, and online. This patchwork of regulation means the product quality, purity, and potency of what you buy can vary enormously, with no federal standards to ensure consistency or screen for contaminants.
Why Kratom Remains Controversial
Kratom sits at the center of an ongoing debate. Advocates argue it is a natural, less dangerous alternative to prescription opioids and that it has helped thousands of people manage pain or quit harder drugs. Some researchers have expressed interest in its alkaloids as potential starting points for developing new pain medications with fewer risks than traditional opioids.
Critics, including the FDA, point to the growing number of reports linking kratom to serious harm and death, particularly when it is combined with other substances. The lack of standardized dosing, quality control, and long-term safety data makes it difficult to know exactly what risks any individual user is taking. Without regulatory oversight, products labeled as kratom can vary wildly in alkaloid content, and some have been found to contain added synthetic compounds or contaminants not listed on the label.