Signs and Symptoms of Kratom Use
Kratom use produces a mixed clinical picture combining opioid-like effects, sympathetic stimulation, and potential psychiatric symptoms, with chronic users developing physical dependence characterized by withdrawal symptoms upon cessation.
Acute Effects of Kratom Use
Opioid-Like Effects
Kratom's primary alkaloids (mitragynine and 7-hydroxymitragynine) act as partial mu-opioid receptor agonists, producing:
- Analgesia (pain relief)
- Euphoria
- Sedation and drowsiness 1, 2
- Miosis (constricted pupils) in some cases 1
- Respiratory depression (less common than with full opioid agonists) 3
Stimulant-Like Effects
At lower doses or in certain individuals, kratom produces sympathetic activation:
Neurological and Psychiatric Manifestations
- Agitation (most common, 18.6% of exposures) 2
- Confusion 2
- Hallucinations and delusions 3, 4
- Anxiety and restlessness 5
- Paranoid delusions (particularly with chronic heavy use) 4
Gastrointestinal Effects
Serious Acute Toxicity
In overdose situations, kratom can cause:
Important caveat: The toxidrome is highly variable 1. The same patient may exhibit both miosis and mydriasis, or both hypertension and bradycardia, reflecting kratom's complex receptor pharmacology involving mu-opioid, delta-opioid, alpha-2 adrenergic, and 5-HT2A receptors 3.
Chronic Use and Dependence
Physical Dependence Signs
Regular kratom users (>6 months) commonly develop moderate to severe dependence 6:
Physical withdrawal symptoms include:
- Muscle spasms and myalgias (muscle pain) 5, 6
- Joint pain 5
- Sleeping difficulty/insomnia 5, 6
- Lacrimation (tearing) and rhinorrhea (runny nose) 5
- Hot flashes and fever/feverish sensations 5, 6
- Decreased appetite 5, 6
- Diarrhea 5, 6
- Tremors 5
- Yawning 5
- Chills 5
- Itching over the body 5
Psychological withdrawal symptoms include:
- Restlessness 5, 6
- Tension and irritability 5, 6
- Anger 6
- Sadness and depressed mood 5, 6
- Nervousness and anxiety 5, 6
- Loss of concentration 5
- Drug craving 5, 6
These withdrawal symptoms mirror opioid withdrawal 7 and become more severe with prolonged use and higher doses. Users consuming ≥3 glasses of kratom tea daily (approximately ≥276.5 mg mitragynine) have significantly higher odds of severe dependence and withdrawal 6.
Neonatal Effects
Newborns of women using kratom regularly during pregnancy can develop neonatal withdrawal symptoms including:
- Oral intolerance
- Restlessness and irritability
- Vomiting 5
Clinical Detection Considerations
Physical examination findings to look for:
- Pupil size (variable: miosis or mydriasis)
- Vital signs (tachycardia vs. bradycardia; hypertension)
- Mental status changes (agitation, confusion, altered consciousness)
- Signs of autonomic instability
- Muscle tenderness or spasms in chronic users
Behavioral indicators:
- Increased fluid intake (dry mouth)
- Dental symptoms or inflammation 8
- Fluctuating consciousness levels 1
Laboratory detection: Kratom alkaloids are not detected on standard urine drug screens. Specialized testing is required and must be specifically requested 3.
Response to naloxone: Variable and unpredictable. Some patients respond to naloxone reversal (suggesting opioid receptor involvement), while others do not 1. This inconsistency reflects kratom's partial agonist properties and multi-receptor activity.
Dose-Related Patterns
The clinical presentation varies with dose 9:
- Lower doses: Predominantly stimulant effects
- Higher doses: Predominantly opioid-like sedation and analgesia
- Chronic high-dose use (≥3 servings daily): Increased risk of severe dependence, withdrawal, and psychiatric complications 6
The average mitragynine content in a single kratom drink is approximately 79 mg, with regular users consuming an average of 276.5 mg daily 6.