Kratom

Kratom is a tropical tree native to Southeast Asia (Malaysia, Thailand, Indonesia) containing alkaloids with opioid-like and stimulant properties. At low doses (1-5g), produces stimulant effects: energy, alertness, increased sociability. At moderate doses (5-15g), produces opioid-like effects: euphoria, analgesia, sedation. At high doses (15g+), produces strong sedation and intense euphoria. Biphasic dose-response: stimulant at low end, opioid-like at high end. Legal status varies by jurisdiction; banned in some US states and countries, legal/unregulated in most others. Withdrawal similar to mild opioid withdrawal.

How It Works

Kratom contains 40+ alkaloids, primarily mitragynine (0.3-0.7%) and 7-hydroxymitragynine (0.01-0.04%). Mitragynine acts as a partial agonist at mu, delta, and kappa opioid receptors and also acts as an agonist at 5-HT7 and 5-HT2A serotonin receptors, and adrenergic receptors. 7-Hydroxymitragynine is a more potent opioid agonist. At low doses, adrenergic effects dominate (stimulation). At high doses, opioid effects dominate (sedation, analgesia). Complex polypharmacology makes effects dose-dependent and variable.

Legal Status

Legal in most US states (as of 2026), but banned in some: Tennessee, Alabama (previously), and several others; regulation ongoing. Some countries ban it (Thailand, Malaysia). Typically sold as botanical supplement; not FDA-regulated. Legal status subject to change.

Dosage Guide (Oral (powder))

Note: Biphasic: 1-5g = stimulant effects. 5-10g = balanced effects. 10-15g = opioid-like effects. 15g+ = strong sedation. Individual sensitivity varies significantly; body weight, tolerance, and alkaloid strain variability affect dosing. Kratom potency varies 2-3x depending on strain and vein color. Red vein = more sedating. White vein = more stimulating. Green vein = balanced. Capsule dosing requires calculation: each capsule ~0.5g. Extracts are 10-50x more concentrated. Tolerance develops rapidly with daily use (weeks). Dose escalation common in chronic users.

Organ System Impacts

cardiovascular — Low

Low-dose use causes mild stimulation: increased heart rate, slight blood pressure elevation. High-dose use causes bradycardia (slower heart rate) and hypotension. Arrhythmias reported rarely. Most users experience minimal cardiovascular impact.

neurological — Moderate

Opioid-like effects on CNS. Low dose stimulates; high dose depresses. Chronic use associated with tolerance, psychological dependence, and potential cognitive changes. Withdrawal produces dysphoria, anxiety, irritability. No major neurotoxicity documented but long-term effects unknown.

ocular — Low

Miosis (pupil constriction) typical. Rarely, visual disturbances reported. No evidence of retinal toxicity or long-term ocular damage.

dermatological — Low

Itching (pruritus) common, especially at higher doses — opioid-like effect. Skin flushing possible. No documented dermatological toxicity.

respiratory — Low

High-dose use may cause mild respiratory depression but much less than pharmaceutical opioids. Rare case reports of severe respiratory depression at extremely high doses. Generally safe for respiratory function.

hepatic — Low

Rare case reports of hepatotoxicity (liver damage), mostly with chronic high-dose use. Some products may contain contaminants or additives (heavy metals reported in some samples). Most users experience no liver damage. Liver function testing recommended for chronic heavy users.

hematological — Low

No direct hematological effects documented. Rare case reports of thrombocytopenia (low platelets) but causality unclear. Generally no impact on blood cell counts.

renal — Low

Rare case reports of acute kidney injury with chronic heavy use, particularly in context of dehydration. Generally kidney-safe. Chronic high-dose users should maintain hydration.

gastrointestinal — Moderate

Nausea very common, especially early use and with powder (tolerance to nausea develops). Constipation from opioid-like effects on GI motility. Stomach upset, cramping, dry mouth common. Opioid-like GI slowing at higher doses.

musculoskeletal — Low

Muscle relaxation at higher doses. No documentation of musculoskeletal damage or rhabdomyolysis. Withdrawal may cause muscle aches.

Effects

Desired Effects

• Stimulation and energy (low dose)
• Euphoria and mood lift (all doses)
• Analgesia (pain relief)
• Anxiety reduction
• Sociability increase
• Sedation and relaxation (high dose)
• Opioid-like warmth and body load
• Improved focus and clarity (low dose)

Negative Effects

• Nausea and vomiting (tolerance develops)
• Dizziness and vertigo
• Headache
• Dependency and withdrawal
• Tolerance development requiring dose escalation
• Fatigue and lethargy at higher doses
• Impaired coordination
• Reduced motivation with chronic use
• Mood disturbances between doses

Rare but Serious

• Liver toxicity (rare, mostly case reports)
• Psychosis (very rare, high doses/chronic use)
• Severe allergic reactions
• Kidney damage (rare)
• Seizures (extremely rare)
• Cardiac arrhythmias (very rare)
• Respiratory depression (very rare, high doses)

Drug Interactions

Detection Times

Kratom (mitragynine) is not detected on standard drug panels. Specialized testing exists.

Urine

Requires specific kratom/mitragynine test. Not on standard panels. Detection window: up to 7 days.

Blood

Blood testing for mitragynine. Detection window: up to 3 days.

Hair

Hair testing for kratom alkaloids. Detection window: up to 90 days.

Harm Reduction Tips

• Do not combine with alcohol, opioids, or benzodiazepines — increased overdose and respiratory depression risk.

• Start with low doses (2-3g) to assess individual sensitivity. Kratom potency varies significantly by strain and vendor.

• Source from reputable vendors. Test for heavy metals and contaminants if possible; some kratom contains lead, cadmium, or other toxins.

• Use 'toss and wash' method (dry powder on tongue, wash down with water) for faster onset than capsules or tea.

• Maintain hydration and monitor for constipation (opioid effect). Increase fiber, water, and use stool softeners if needed.

• Mix powder with bitter beverages (cranberry juice, lemon juice) to mask bitter taste and improve tolerance.

• Understand biphasic dosing: stimulant effects at 1-5g, opioid-like effects at 5-15g+. Choose appropriate dose for desired effect.

• Nausea is common early; tolerance usually develops within days. Ginger supplement, anti-nausea medication, or smaller doses may help initially.

• Take kratom breaks (3-7 days) regularly to prevent rapid tolerance escalation. Users often escalate from 5g to 20-30g within weeks of daily use.

• Be aware of withdrawal risks: psychological dependence develops quickly with daily use. Quit gradually to minimize withdrawal.

• Avoid high-dose daily use; limit to 3-4x weekly to prevent dependence and tolerance escalation.

• Keep doses under 15g per day if using daily; higher doses increase withdrawal severity and other risks.

• If dependent, taper gradually (10-20% dose reduction every few days) rather than quitting suddenly to minimize withdrawal severity.

• Monitor liver function with chronic heavy use (monthly liver function tests if using daily for months).

• Do not drive or operate machinery within 4 hours of use, especially at higher doses.

• Use capsules for discreet use; extracts provide more intense effects but higher addiction/withdrawal potential and cost.

Withdrawal Symptoms

Severity: Moderate

Onset: 12-24 hours. Peak: days 2-4. Acute phase: 5-7 days. Protracted symptoms (mood, cravings): 2-4 weeks.

Physical

• Muscle aches
• Insomnia
• Nausea and vomiting
• Sweating and hot flashes
• Diarrhea
• Runny nose
• Tremors

Psychological

• Irritability and mood swings
• Anxiety
• Depression
• Cravings
• Restlessness

Emergency Information

Call 911 If:

• Respiratory depression (breathing fewer than 8 times per minute)
• Loss of consciousness lasting >5 minutes
• Severe bradycardia (<40 bpm with symptoms)
• Severe hypotension with altered mental status
• Severe allergic reaction/anaphylaxis
• Seizures
• Severe abdominal pain or signs of liver failure
• Signs of kidney failure (decreased urination, back pain, brown urine)
• Inability to move limbs or paralysis
• Severe confusion or altered mental status lasting >1 hour

Warning Signs

• Severe respiratory depression (slow, shallow breathing, cyanosis)
• Loss of consciousness lasting more than a few minutes
• Severe bradycardia (heart rate <40 bpm)
• Severe hypotension (systolic BP <70 mmHg)
• Severe allergic reaction (angioedema, anaphylaxis)
• Seizures
• Severe agitation or psychosis
• Signs of liver failure (jaundice, abdominal pain, dark urine, confusion)
• Acute kidney injury signs (decreased urination, back pain, dark urine)

What To Do

1. Move person to safe location.
2. Check airway, breathing, circulation. Perform CPR if needed.
3. Place in recovery position if unconscious.
4. Monitor vital signs: breathing rate, heart rate, blood pressure.
5. Keep person hydrated if conscious (small sips).
6. Cool person if overheated (though hyperthermia rare with kratom).
7. Keep person calm and reassured.
8. Have medical history and kratom dose information ready for paramedics.
9. Do not leave person alone.