Propylhexedrine
Propylhexedrine is a cyclohexyl analogue of methamphetamine, sold legally in some countries as a nasal decongestant inhaler but also misused as a stimulant. Its recreational and misuse pharmacology is better documented than most items in this set, including case reports of cardiovascular and psychiatric toxicity from abuse.
01 Overview
Propylhexedrine replaces the aromatic ring of methamphetamine with a saturated cyclohexyl ring, yielding a sympathomimetic with decongestant and CNS-stimulant activity. It is marketed in some regions as an over-the-counter nasal inhaler, and this availability has driven a long history of misuse, including extraction and injection.
Compared with most novel RCs, propylhexedrine has more documented human toxicology, including case reports of hypertension, arrhythmia, cardiomyopathy and stimulant psychosis with heavy misuse. As a stimulant it carries the class hazards of cardiovascular strain, comedown and dependence.
02 Mechanism
Acts as a releasing agent for noradrenaline and dopamine, producing vasoconstriction (decongestion) and central stimulation, similar to but less potent than methamphetamine.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Light | 25–75 mg | Oral | Recreational misuse range; far above therapeutic decongestant exposure. |
| Common | 25–100 mg | Insufflated | Insufflation of extracted material is harsh and increases risk. |
| Common | 75–150 mg | Oral | Higher misuse doses raise cardiovascular and psychiatric risk. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Stimulation and wakefulnessEnergy and alertness sought in recreational misuse. | moderate | Anecdotal | |
| EuphoriaMild dopaminergic euphoria, weaker than methamphetamine. | Anecdotal | ||
| Nasal decongestionIts intended medical effect; vasoconstriction relieves nasal congestion. | Observational |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Compulsive redosing and dependenceShort duration and reinforcement drive repeated use and dependence. | Moderate | Common | Observational | |
| Cardiovascular strainHypertension, tachycardia, arrhythmia and, with heavy misuse, cardiomyopathy have been reported. | Severe | Common | Observational | |
| Stimulant psychosisParanoia, hallucinations and agitation reported with heavy or prolonged misuse. | Severe | Uncommon | Observational |