Oxilofrine

Oxilofrine Overview

Oxilofrine (chemically designated as 4-[1-hydroxy-2-(methylamino)propyl]phenol; also known as 4-hydroxyephedrine or methylsynephrine; chemical formula C10H15NO2) is a substituted phenethylamine and amphetamine derivative. Chemically, it belongs to the class of organic compounds known as phenylpropanes within the benzenoids superclass. Structurally, it is the 4-hydroxylated structural analogue of ephedrine, featuring a central benzene ring bearing a para-hydroxyl group and a 1-hydroxy-2-methylaminopropyl side chain.

In respiratory medicine, cardiology, and sports pharmacology, Oxilofrine functions as a sympathomimetic amine, cardiac stimulant, and indirect-acting alpha- and beta-adrenergic receptor agonist. Formulated primarily as oral drops in fixed-dose combination with the opioid antitussive normethadone (marketed under trade names such as Cophylac and Ticarda), it was indicated as an antitussive for managing severe cough associated with respiratory tract inflammation. It was also historically utilized as an antihypotensive agent to manage orthostatic hypotension due to its cardiac inotropic and vasoconstrictive properties. Oxilofrine has never been approved by the US FDA for pharmaceutical distribution or as a dietary supplement ingredient, and its use is prohibited in competitive athletics by the World Anti-Doping Agency (WADA).

What Is Oxilofrine and How Does It Work?

Oxilofrine acts primarily through sympathomimetic activation of alpha-1 and beta-1 adrenergic receptors and inhibition of sodium-dependent monoamine transporters, promoting airway mucosal vasoconstriction and cardiovascular stimulation.

Its primary chemical, physiological, and pharmacological mechanisms include:

• Alpha-1 Adrenergic Vasoconstriction: Oxilofrine stimulates alpha-1 adrenergic receptors on vascular smooth muscle within the respiratory mucosa. This induces localized vasoconstriction, reduces capillary engorgement, decreases mucus secretions into the bronchial tree, and diminishes the peripheral sensory stimulus triggering the cough reflex.
• Beta-1 Adrenergic Cardiac Stimulation: It acts as an agonist at cardiac beta-1 adrenergic receptors, increasing myocardial contractility (positive inotropic effect), stroke volume, and left ventricular ejection fraction to raise systemic blood pressure.
• Indirect Norepinephrine Release: As a substituted phenethylamine, Oxilofrine acts as a norepinephrine releasing agent, increasing synaptic catecholamine availability in peripheral sympathetic nerve endings.
• Monoamine Transporter Inhibition: It inhibits the human sodium-dependent noradrenaline transporter and dopamine transporter, slowing catecholamine reuptake and prolonging sympathetic stimulation.

Is Oxilofrine FDA Approved?

Oxilofrine has never been approved by the US FDA as a pharmaceutical drug or a lawful dietary supplement ingredient in the United States. Its approval status is Not Approved.

What Is Oxilofrine Used For?

• Historical combination therapy with normethadone (e.g., Cophylac drops) for the symptomatic relief of severe cough associated with inflamed respiratory mucosa.
• Historical treatment of orthostatic hypotension and hypotensive circulatory states.
• Research tool in sympathomimetic and cardiovascular pharmacology.

Before Taking Oxilofrine: Contraindications & Precautions

Do not use Oxilofrine in patients with severe hypertension, coronary artery disease, tachyarrhythmias, hyperthyroidism, closed-angle glaucoma, or pheochromocytoma. Co-administration with monoamine oxidase inhibitors (MAOIs) or other sympathomimetic stimulants is strictly contraindicated due to the risk of hypertensive crisis.

Who Should Not Take Oxilofrine?

• Individuals with known hypersensitivity to Oxilofrine, ephedrine analogues, or sympathomimetic amines.
• Patients with severe arterial hypertension, unstable angina, or recent myocardial infarction.
• Competitive athletes subject to World Anti-Doping Agency (WADA) anti-doping regulations (banned as a prohibited stimulant).

Oxilofrine, Pregnancy & Reproductive Safety

Adequate and well-controlled reproductive toxicity studies in humans are lacking. Uterine vascular constriction and potential fetal tachycardia mediated by sympathomimetic alpha- and beta-adrenergic stimulation can compromise uteroplacental blood flow. Oxilofrine is not recommended for use during pregnancy or lactation.

Tell Your Doctor Before Taking Oxilofrine

Inform your physician if you have a history of cardiovascular disease, cardiac arrhythmias, high blood pressure, diabetes mellitus, thyroid dysfunction, or are undergoing routine drug testing for competitive sports.

Oxilofrine Dosage & Administration

Historically formulated in oral solution drops containing 20 mg/mL Oxilofrine hydrochloride combined with 10 mg/mL normethadone hydrochloride.

Standard Oxilofrine Dosing

• Historical Combination Oral Antitussive Dosing: Administered as 15 to 30 drops (approximately 10 mg to 20 mg Oxilofrine) orally 2 to 3 times daily for short-term cough management under medical supervision.

How Oxilofrine Is Administered

• Administered orally using a calibrated drop dispenser, diluted in a small amount of water or taken directly.
• Avoid taking late in the evening or at bedtime to reduce the risk of insomnia caused by central nervous system stimulation.

Oxilofrine Clinical Efficacy & Safety Profile

Historical clinical use in fixed combination with normethadone demonstrated effective cough suppression by pairing central opioid cough-center inhibition with peripheral adrenergic decongestion of respiratory mucosa. However, its cardiac stimulatory properties including elevations in blood pressure and stroke volume present substantial cardiovascular risks. Uncontrolled ingestion via adulterated sports or weight-loss dietary supplements has been linked to severe adverse events including chest pain, tachyarrhythmias, and cardiac arrest.

Oxilofrine Side Effects & Safety Profile

Common adverse effects include palpitations, tachycardia, hypertension, nervousness, tremor, insomnia, nausea, and dizziness. Serious adverse risks include severe cardiac arrhythmias, chest pain, hypertensive crisis, myocardial ischemia, and potential addiction or dependence when combined with opioid antitussives. Holds no FDA Black Box Warning due to unapproved status.

Common Oxilofrine Side Effects

• Cardiovascular: Palpitations, increased heart rate (tachycardia), elevated blood pressure, and facial flushing.
• Central Nervous System & Gastrointestinal: Restlessness, anxiety, insomnia, dizziness, headache, tremor, and nausea.

Serious Oxilofrine Adverse Events

• Severe Cardiovascular Events: Cardiac arrhythmias, angina pectoris, marked hypertensive crisis, and risk of cardiac arrest.
• Adulterated Supplement Toxicity: Severe acute cardiovascular toxicity resulting from undeclared, high-dose inclusion in sports performance supplements.

Managing Oxilofrine Side Effects

If severe chest pain, rapid heart rate, or severe headache occurs, discontinue use immediately and seek emergency cardiovascular evaluation.

Oxilofrine Drug Interactions & What to Avoid

Co-administration with sympathomimetics or monoamine oxidase inhibitors increases adrenergic toxicity risks.

Oxilofrine Drug-Drug Interactions

• Monoamine Oxidase Inhibitors (MAOIs): Co-administration can precipitate life-threatening hypertensive crises by blocking catecholamine metabolism.
• Other Sympathomimetics & Stimulants (e.g., Ephedrine, Caffeine, Amphetamines): Synergistic cardiovascular stimulation increases risks of severe hypertension, arrhythmias, and cardiac arrest.
• Beta-Blockers: Non-selective beta-blockers may leave alpha-1 vasoconstriction unopposed, leading to marked hypertension and reflex bradycardia.

Oxilofrine, Food & Alcohol

Avoid taking with dietary supplements containing undeclared or declared stimulants (such as synephrine, caffeine, or green tea extracts). Avoid alcohol consumption due to additive central nervous system and cardiovascular effects.

Oxilofrine: Missed Dose, Overdose & Storage

Take missed doses as soon as remembered unless close to the next dose. Overdose produces marked sympathetic overdrive. Store at controlled room temperature (15°C–25°C).

Missed Dose of Oxilofrine

Take the missed dose as soon as remembered. If it is almost time for your next scheduled dose, skip the missed dose and resume your regular dosing schedule. Do not double doses.

Oxilofrine Overdose & Emergency

Acute overdose causes severe hypertension, rapid tachyarrhythmias, agitation, tremor, hyperthermia, chest pain, and potential cardiovascular collapse. Emergency management includes gastric lavage or activated charcoal, continuous cardiac monitoring, and intravenous beta-blockers or phentolamine to manage adrenergic toxicity.

How to Store Oxilofrine

Store oral solutions at controlled room temperature between 15°C and 25°C (59°F to 77°F). Protect from light and freezing. Keep containers tightly closed and strictly out of reach of children.

Oxilofrine Patient Management & Monitoring

Requires baseline and ongoing monitoring of blood pressure, heart rate, and cardiovascular status.

Tests Before Starting Oxilofrine

Baseline blood pressure, heart rate, electrocardiogram (ECG) in patients with cardiac risk factors, and screening for concurrent stimulant or MAOI use.

Monitoring During Oxilofrine Treatment

Regular monitoring of resting blood pressure and pulse rate; watching for signs of central nervous system excitation or cardiac arrhythmias.

Oxilofrine Do’s and Don’ts

• Do consult a healthcare provider for safe, approved cough management options.
• Do check dietary supplement labels carefully to avoid illegal, undeclared stimulants like methylsynephrine.
• Do not use Oxilofrine if you are a competitive athlete (violates WADA anti-doping rules).
• Do not combine with other over-the-counter decongestants or caffeine-containing stimulants.

Frequently Asked Questions

References

• DrugBank Database – Oxilofrine Clinical Profile (DB11610)
• Classyfire Database – Phenylpropanes / Benzenoids Taxonomy Profile
• US Food and Drug Administration (FDA) Safety Alerts – Unapproved Methylsynephrine (Oxilofrine) in Dietary Supplements

Legal Disclaimer

The detailed medical and chemical information provided on this specific web page is intended strictly for educational and informational purposes regarding complex pharmacological mechanisms. It absolutely does not constitute professional medical advice, medical diagnosis, or specific treatment recommendations. Always consult a licensed healthcare provider before making any personal decisions regarding complex medical conditions, medication adjustments, or dietary changes.