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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Standardized Insect Allergenic Extract [EPC]
Aspidosperma Quebracho-blanco Bark is a botanical extract containing potent alkaloids used for respiratory stimulation and as an adrenergic agonist. It is classified under several allergenic extract categories and as an alpha/beta-adrenergic agent.
Name
Aspidosperma Quebracho-blanco Bark
Raw Name
ASPIDOSPERMA QUEBRACHO-BLANCO BARK
Category
Standardized Insect Allergenic Extract [EPC]
Drug Count
8
Variant Count
9
Last Verified
February 17, 2026
About Aspidosperma Quebracho-blanco Bark
Aspidosperma Quebracho-blanco Bark is a botanical extract containing potent alkaloids used for respiratory stimulation and as an adrenergic agonist. It is classified under several allergenic extract categories and as an alpha/beta-adrenergic agent.
Detailed information about Aspidosperma Quebracho-blanco Bark
References used for this content
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Aspidosperma Quebracho-blanco Bark.
Aspidosperma Quebracho-blanco Bark is a pharmacologically active botanical substance derived from the evergreen tree native to the Gran Chaco region of South America, primarily Argentina, Bolivia, and Paraguay. The name "Quebracho" is derived from the Spanish phrase "quiebra hacha," meaning "ax-breaker," a testament to the extreme hardness of its wood. In clinical pharmacology, the bark is highly valued for its dense concentration of indole alkaloids, most notably aspidospermine and yohimbine (historically referred to in this context as quebrachine).
Aspidosperma Quebracho-blanco Bark belongs to a complex class of drugs that includes Standardized and Non-Standardized Allergenic Extracts [EPC], as well as alpha-Adrenergic and beta-Adrenergic Agonists [EPC]. While it has a long history in traditional medicine for treating respiratory ailments, its modern clinical relevance is often tied to its role as a respiratory stimulant and its inclusion in allergenic testing panels. According to the FDA’s Established Pharmacologic Class (EPC) system, it is categorized as a Catecholamine-related substance due to its profound impact on the autonomic nervous system. The FDA has historically permitted the use of these extracts in specific allergenic and homeopathic contexts, though it is not typically the first-line treatment for acute respiratory distress in modern hospital settings.
The mechanism of action for Aspidosperma Quebracho-blanco Bark is multi-faceted, involving the synergy of several alkaloids. The primary alkaloid, aspidospermine, acts as a respiratory stimulant. It is believed to increase the respiratory rate and depth by stimulating the respiratory center in the medulla oblongata (the part of the brain responsible for autonomic functions). This stimulation enhances the efficiency of oxygen exchange and carbon dioxide removal, making it a subject of interest for chronic obstructive pulmonary disease (COPD) and asthma research.
Furthermore, the bark contains yohimbine (quebrachine), which acts as a potent alpha-2 adrenergic antagonist. By blocking these receptors, it increases the release of norepinephrine in the synaptic cleft, leading to peripheral vasodilation and increased heart rate. Simultaneously, components of the extract exhibit beta-adrenergic agonist activity, which contributes to bronchodilation (the relaxation of the muscles in the lungs' airways). This dual action on the adrenergic system allows the extract to modulate vascular tone and pulmonary capacity, although it requires careful monitoring due to the potential for systemic cardiovascular effects.
Understanding the pharmacokinetics of Aspidosperma Quebracho-blanco Bark is essential for clinical safety, as the absorption and metabolism of its various alkaloids can vary significantly among patients.
Aspidosperma Quebracho-blanco Bark is utilized in several clinical and diagnostic contexts. While not all uses are FDA-approved for primary therapy, they are recognized in various pharmacopeias:
Aspidosperma Quebracho-blanco Bark is available in several formulations, depending on the intended use:
> Important: Only your healthcare provider can determine if Aspidosperma Quebracho-blanco Bark is right for your specific condition. The use of botanical extracts should always be supervised by a medical professional to avoid dangerous interactions.
Dosing for Aspidosperma Quebracho-blanco Bark is not standardized across all manufacturers, as it is often sold as a botanical supplement or homeopathic remedy. However, clinical literature suggests the following ranges for adults:
For allergenic testing, the dosage is determined by the specific protocol of the allergist and is administered in minute quantities (microliters) via intradermal or percutaneous routes.
Aspidosperma Quebracho-blanco Bark is generally NOT recommended for use in children under the age of 18. The potent alkaloids, particularly those affecting the central nervous system and cardiovascular system, have not been sufficiently studied in pediatric populations. Children are more sensitive to the stimulant effects of yohimbine and aspidospermine, which could lead to severe adverse reactions such as tachycardia or extreme agitation.
Patients with decreased kidney function (reduced GFR) should use this substance with extreme caution. Because the metabolites are primarily excreted through the urine, renal impairment can lead to toxic accumulation. A dose reduction of at least 50% may be necessary, or the drug may need to be avoided entirely.
Since the liver (CYP enzymes) is responsible for the metabolism of Quebracho alkaloids, patients with cirrhosis or hepatitis are at a higher risk of toxicity. Use is generally contraindicated in severe hepatic impairment.
Geriatric patients (65 years and older) often have reduced physiological reserves and may be taking multiple medications. Dosing should start at the lowest possible end of the spectrum (e.g., 25% of the standard adult dose) to monitor for cardiovascular strain or confusion.
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and resume your regular schedule. Do not double the dose to catch up, as this significantly increases the risk of cardiovascular side effects.
An overdose of Aspidosperma Quebracho-blanco Bark is a medical emergency. Signs of overdose include:
In the event of a suspected overdose, contact your local poison control center or seek emergency medical attention immediately. Treatment is generally supportive, focusing on stabilizing blood pressure and heart rhythm.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or stop taking this medication without medical guidance, as sudden changes can affect your heart rate and blood pressure.
Most patients taking Aspidosperma Quebracho-blanco Bark will experience some level of autonomic nervous system stimulation. Common side effects include:
> Warning: Stop taking Aspidosperma Quebracho-blanco Bark and call your doctor immediately if you experience any of these serious symptoms:
Prolonged use of Aspidosperma Quebracho-blanco Bark has not been extensively studied in clinical trials. However, chronic use of its constituent alkaloids (like yohimbine) may lead to:
Currently, the FDA has not issued a formal Black Box Warning specifically for Aspidosperma Quebracho-blanco Bark. However, it is important to note that many products containing its primary alkaloid, yohimbine, carry warnings regarding cardiovascular risk and psychiatric exacerbation. Healthcare providers generally treat this extract with the same level of caution as other potent adrenergic agents.
Report any unusual symptoms or changes in your health to your healthcare provider immediately. Monitoring your blood pressure and heart rate at home may be recommended during the initial phase of treatment.
Aspidosperma Quebracho-blanco Bark is a potent pharmacological agent that affects the heart, lungs, and central nervous system. It should never be used as a substitute for emergency asthma inhalers or primary cardiac medications. Patients must be aware that botanical extracts can vary in potency, making professional medical supervision vital.
No FDA black box warnings for Aspidosperma Quebracho-blanco Bark have been issued as of 2026. However, clinicians are advised to monitor for signs of severe cardiovascular distress, which is a known risk of its constituent alkaloids.
If you are prescribed or taking Aspidosperma Quebracho-blanco Bark long-term, your healthcare provider may require the following:
This medication may cause dizziness, tremors, or sudden changes in blood pressure. Do not drive, operate heavy machinery, or engage in dangerous activities until you know how Aspidosperma Quebracho-blanco Bark affects you.
Alcohol should be strictly avoided while taking Aspidosperma Quebracho-blanco Bark. Alcohol can potentiate the vasodilator effects, leading to a dangerous drop in blood pressure, or it may increase the risk of CNS side effects like dizziness and confusion.
Do not stop taking this medication abruptly if you have been using it for an extended period. While it is not traditionally associated with a "withdrawal syndrome," a sudden stop can cause a rebound effect in respiratory symptoms or blood pressure fluctuations. Your doctor will provide a tapering schedule if necessary.
> Important: Discuss all your medical conditions, including any history of heart disease or mental health issues, with your healthcare provider before starting Aspidosperma Quebracho-blanco Bark.
Aspidosperma Quebracho-blanco Bark may interfere with certain medical tests:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. A complete list is necessary to prevent dangerous pharmacological cross-reactions.
Aspidosperma Quebracho-blanco Bark must NEVER be used in the following circumstances:
In these cases, the healthcare provider must perform a careful risk-benefit analysis:
Patients who are allergic to other members of the dogbane family (Apocynaceae) may experience cross-sensitivity. Additionally, those who have had adverse reactions to yohimbine-containing products (such as Pausinystalia johimbe) are highly likely to react poorly to Aspidosperma Quebracho-blanco Bark.
> Important: Your healthcare provider will evaluate your complete medical history, including any underlying conditions, before prescribing or recommending Aspidosperma Quebracho-blanco Bark.
Aspidosperma Quebracho-blanco Bark is classified as Category X (or equivalent) in many clinical guidelines for pregnancy. It is strictly contraindicated for use during pregnancy. The alkaloids, specifically yohimbine, are known to have oxytocic properties, meaning they can stimulate uterine contractions and potentially lead to miscarriage or premature labor. Furthermore, there is insufficient data regarding the teratogenic (birth defect-causing) potential of these alkaloids on the developing fetus.
It is unknown whether the alkaloids of Quebracho bark pass into human breast milk. However, due to their low molecular weight and lipophilic nature, it is highly probable that they do. Given the extreme sensitivity of infants to adrenergic stimulants, breastfeeding is not recommended while taking this medication. Potential risks to the nursing infant include irritability, tachycardia, and disrupted sleep patterns.
Safety and effectiveness in pediatric patients have not been established. The use of this extract in children is generally avoided due to the high risk of central nervous system toxicity and cardiovascular instability. It is not approved for any condition in children under the age of 18.
Elderly patients are at an increased risk for adverse effects. Age-related declines in hepatic and renal function mean that the drug stays in the system longer. Furthermore, the elderly are more susceptible to the hypertensive effects, which increases the risk of stroke or heart failure. Clinical monitoring should be frequent, and polypharmacy (the use of multiple drugs) must be carefully managed to avoid interactions.
In patients with a GFR below 30 mL/min, the use of Aspidosperma Quebracho-blanco Bark is generally avoided. For those with mild to moderate impairment (GFR 30-60 mL/min), doses should be significantly reduced, and renal function markers (BUN and Creatinine) should be checked every 2-4 weeks.
Patients with Child-Pugh Class B or C hepatic impairment should not use this extract. The liver's inability to clear the indole alkaloids can lead to rapid onset of CNS toxicity and respiratory depression.
> Important: Special populations require individualized medical assessment. Never start this medication if you fall into one of these categories without a thorough consultation with a specialist.
Aspidosperma Quebracho-blanco Bark exerts its effects through a complex interaction with the autonomic nervous system. The primary alkaloid, aspidospermine, acts as a central respiratory stimulant, increasing the sensitivity of the medullary respiratory center to carbon dioxide. This results in an increase in both the rate and depth of breathing.
Simultaneously, the alkaloid yohimbine (quebrachine) acts as a selective, competitive alpha-2 adrenergic antagonist. By blocking alpha-2 receptors on pre-synaptic nerve terminals, it prevents the feedback inhibition of norepinephrine. This leads to a surge of norepinephrine in the synapse, which stimulates alpha-1 and beta-receptors throughout the body. The beta-adrenergic agonist activity of other minor alkaloids in the bark promotes the relaxation of bronchial smooth muscle, facilitating easier airflow.
The onset of action for the respiratory effects is typically 30 to 60 minutes after oral administration. The duration of effect is relatively short, usually lasting 2 to 4 hours. Tolerance to the respiratory stimulant effects can develop with chronic use, as the body's receptors may down-regulate in response to constant stimulation.
| Parameter | Value |
|---|---|
| Bioavailability | 7% - 30% (Highly variable) |
| Protein Binding | ~82% (Primarily to albumin) |
| Half-life | 0.5 - 2.0 hours |
| Tmax | 1.0 - 1.5 hours |
| Metabolism | Hepatic (CYP2D6, CYP3A4) |
| Excretion | Renal (>60%), Fecal (<20%) |
Aspidosperma Quebracho-blanco Bark is classified as a botanical adrenergic agonist and an allergenic extract. It shares pharmacological similarities with other alpha-blockers and respiratory stimulants like theophylline, though its specific alkaloid profile is unique to the Aspidosperma genus.
Common questions about Aspidosperma Quebracho-blanco Bark
Aspidosperma Quebracho-blanco Bark is primarily used as a respiratory stimulant to help alleviate shortness of breath associated with conditions like asthma, bronchitis, and emphysema. It contains alkaloids like aspidospermine that stimulate the brain's respiratory center to increase oxygen intake. Additionally, it is used in allergenic extracts for diagnostic skin testing to identify plant-based allergies. Some people use it off-label for its stimulant properties or to treat erectile dysfunction due to its yohimbine content. However, it should only be used under the strict supervision of a healthcare provider.
The most common side effects include gastrointestinal issues such as nausea, vomiting, and stomach upset. Because it acts as a stimulant, many users also report feeling dizzy, having headaches, or experiencing increased salivation. You may also feel jittery or anxious, and some people experience a rapid heart rate or palpitations. These effects are often dose-dependent and may decrease as the body adjusts, but they should always be reported to a doctor. If side effects become severe, the medication should be discontinued immediately.
No, you should avoid drinking alcohol while taking this medication. Alcohol can interact with the alkaloids in the bark to cause unpredictable changes in blood pressure, potentially leading to severe dizziness or fainting. It can also increase the sedative effects of alcohol or, conversely, mask the signs of intoxication, leading to dangerous situations. Combining the two puts excessive strain on the liver, which is responsible for processing both substances. Always consult your doctor about lifestyle restrictions while on this treatment.
Aspidosperma Quebracho-blanco Bark is considered unsafe during pregnancy and is generally contraindicated. One of its main components, yohimbine, is known to stimulate uterine contractions, which can increase the risk of miscarriage or premature birth. There is also a lack of comprehensive studies regarding its effects on fetal development. If you are pregnant, planning to become pregnant, or breastfeeding, you should avoid this substance entirely. Always discuss safer alternatives for respiratory or other health issues with your obstetrician.
When taken orally as a tincture or capsule, the effects of Aspidosperma Quebracho-blanco Bark typically begin within 30 to 60 minutes. Peak levels in the bloodstream are usually reached within 90 minutes of ingestion. The duration of the respiratory stimulation is relatively short, often lasting only 2 to 4 hours, which is why multiple doses per day are sometimes recommended. However, the exact timing can vary based on your metabolism and whether you took the dose with food. Do not take more than prescribed if you don't feel immediate effects.
While it is not known to cause a traditional physical addiction, you should not stop taking it suddenly if you have been using it long-term without consulting your doctor. Abrupt discontinuation can cause a rebound effect, where your respiratory symptoms or blood pressure might fluctuate unexpectedly. Your healthcare provider will likely suggest a tapering schedule to slowly reduce the dose. This allows your autonomic nervous system to return to its baseline state safely. Always follow the professional guidance provided for stopping any botanical or pharmacological extract.
If you miss a dose, you should take it as soon as you remember, provided it is not too close to your next scheduled dose. If it is nearly time for your next dose, skip the missed one and continue with your regular schedule. Never take two doses at once to make up for a missed one, as this significantly increases the risk of heart palpitations and high blood pressure. Keeping a consistent schedule helps maintain the effectiveness of the treatment. If you frequently miss doses, consider using a pill organizer or a reminder app.
There is currently no clinical evidence to suggest that Aspidosperma Quebracho-blanco Bark causes weight gain. In fact, because it contains yohimbine—a stimulant that can increase heart rate and metabolic activity—some people have used it off-label for weight loss, though this is not a recommended or FDA-approved use. Any sudden changes in weight while taking this medication should be discussed with your doctor, as it could be a sign of an underlying issue like fluid retention. It is important to focus on the intended respiratory or allergenic uses of the drug.
Aspidosperma Quebracho-blanco Bark has many potential drug interactions and should be used with caution alongside other medications. It can be particularly dangerous when combined with MAO inhibitors, as this can cause a life-threatening spike in blood pressure. It may also interfere with blood pressure medications, antidepressants, and other stimulants like caffeine. You must provide your healthcare provider with a full list of all prescription drugs, over-the-counter medicines, and herbal supplements you are taking. This allows them to screen for dangerous combinations and adjust your treatment plan accordingly.
Aspidosperma Quebracho-blanco Bark is primarily available as a botanical extract, homeopathic remedy, or non-standardized allergenic extract rather than a traditional brand-name prescription drug. Therefore, it does not have a 'generic' version in the way that drugs like lisinopril do. You will find it sold under various botanical names or as part of multi-ingredient respiratory supplements. Because these products are not as strictly regulated as standard pharmaceuticals, the quality and concentration of the active alkaloids can vary significantly between brands. Always choose a reputable source and consult a pharmacist or doctor.