Chewing khat produces a mild stimulant high often compared to a strong cup of coffee mixed with a low dose of amphetamine. Effects begin about 15 to 30 minutes after you start chewing, peak during the first hour, and gradually fade over the next two to three hours. What follows is a distinct comedown that can last several more hours, marked by irritability and trouble sleeping.
How It Works in the Brain
Khat’s main psychoactive ingredient is cathinone, a compound structurally related to amphetamine. It works by triggering a release of dopamine and norepinephrine in the brain while also slowing their reabsorption. The result is a surge of the same chemicals involved in alertness, motivation, and reward. Cathinone is roughly one-third as potent as amphetamine at affecting serotonin pathways, which helps explain why khat’s mood effects are milder than those of stronger stimulants.
A second compound, cathine, contributes to the stimulation but is weaker than cathinone. Fresh leaves contain the highest concentration of cathinone (around 0.12 to 0.16% by weight). Once leaves are picked and begin to dry, cathinone breaks down rapidly, which is why khat is almost always consumed fresh, often within a day or two of harvest. Dried leaves that have been stored for months can lose more than 80% of their cathinone content.
The High: First One to Three Hours
In a study of 14 subjects, 10 reported euphoria, improved mental sharpness, and a feeling of heightened alertness. People describe feeling talkative, confident, and socially energized. Thoughts come faster, concentration feels easier, and there’s a general sense of well-being. The experience is social by nature: khat is traditionally chewed in groups over long sessions, and the stimulant effect tends to make people more engaged in conversation.
Not everyone has a pleasant experience, though. Four of those same 14 subjects reported only dysphoria (a vague sense of unease) and mild sedation instead of euphoria. Individual brain chemistry, dosage, and the freshness of the leaves all play a role in which direction the experience tips.
Physical Sensations
The stimulant effects aren’t just mental. A typical session involves chewing 100 to 500 grams of leaves, and around 80% of the active compounds are extracted into saliva within the first 15 to 45 minutes. Absorption starts through the lining of the mouth before continuing in the stomach.
Heart rate rises by about 6% on average. In a study of 25 chewers, three experienced heart rates fast enough to qualify as tachycardia. Blood pressure increases on both the systolic and diastolic sides. Heart rate variability, a measure of how flexibly your cardiovascular system responds to changes, drops by nearly 20%. These cardiovascular effects persist for about three to four hours.
Most users also notice a suppressed appetite. The anorectic effect is consistent enough that hunger tends to return only after the drug has worn off. Your mouth may feel dry, and some people report a mild increase in body temperature, consistent with the stimulant’s effect on adrenaline and noradrenaline release throughout the body.
The Comedown
As the stimulant phase winds down, the experience shifts noticeably. The talkative, outgoing state gives way to a quieter, more introverted mood. This transition then slides into restlessness, irritability, and a low, mildly depressive feeling. The contrast with the earlier euphoria can make the comedown feel sharper than it might otherwise be.
Sleep disruption is one of the most reliable aftereffects. Users frequently report difficulty falling asleep the night after a session and a hungover, sluggish feeling the next morning. Data from a large study found that about 51% of male khat-only users and 58% of female khat-only users qualified as poor sleepers, compared to just 10% of non-using men and 37% of non-using women. The sleep problems aren’t subtle: they correlate with increased negative mood, including feelings of sadness, anxiety, and general discontent.
How the Timeline Breaks Down
A chewing session follows a fairly predictable arc:
- 0 to 15 minutes: Leaves are chewed into a wad held against the cheek. Effects haven’t started yet, though you may notice the bitter, astringent taste.
- 15 to 30 minutes: The first wave of stimulation begins as cathinone absorbs through the mouth’s lining. Mood lifts, alertness increases.
- 30 to 90 minutes: Peak effects. Euphoria, talkativeness, and mental energy are at their strongest. Heart rate and blood pressure are elevated.
- 2 to 3 hours: The pleasant effects begin to fade. You may start to feel quieter and less social.
- 3 to 6 hours: The comedown phase. Irritability, restlessness, and low mood settle in. Appetite returns.
- Evening and overnight: Insomnia is common, even if the session took place hours earlier. Sleep quality is measurably worse.
Khat vs. Stronger Stimulants
People often ask how khat compares to drugs like amphetamine or cocaine. The mechanism is similar (all three boost dopamine and norepinephrine), but the intensity is significantly lower. Cathinone is less potent than amphetamine, and the slow absorption through chewing produces a more gradual onset than snorting or swallowing a pill. The high is functional rather than overwhelming: most users can hold a conversation, work, or drive, though judgment and reaction time may still be affected.
That said, the cardiovascular strain is real and dose-dependent. A single heavy session can push heart rate and blood pressure into ranges that stress the heart, and repeated use has been linked to irregular heart rhythms and changes in the heart’s electrical activity. The experience may feel mild compared to pharmaceutical stimulants, but the physical load on the body is not trivial.