Kan Jang: Uses, Dosage & Side Effects
Andrographis paniculata extract – herbal remedy for common cold and upper respiratory tract infections
Quick Facts about Kan Jang
Key Takeaways about Kan Jang
- Clinically studied herbal remedy: Multiple randomized controlled trials support its use for reducing the severity and duration of common cold symptoms
- Start early for best results: Treatment should be initiated as soon as cold symptoms appear for maximum benefit, ideally within the first 24–48 hours
- Short-term use only: Do not take for more than 7 consecutive days; consult a healthcare provider if symptoms persist or worsen
- Not for everyone: Avoid during pregnancy and breastfeeding; not recommended for children under 12 years of age
- Watch for interactions: May interact with anticoagulants, immunosuppressants, and antihypertensive medications – always inform your doctor about herbal supplements
What Is Kan Jang and What Is It Used For?
Kan Jang is a traditional herbal medicinal product used for the short-term relief of symptoms of the common cold and uncomplicated upper respiratory tract infections. It contains a standardized extract of Andrographis paniculata, a plant with well-documented immunomodulatory and anti-inflammatory properties that has been used in traditional medicine for centuries.
Kan Jang is based on Andrographis paniculata, a plant native to South and Southeast Asia that has a long history of use in traditional Ayurvedic and Chinese medicine systems. The plant, often referred to as the "King of Bitters" due to its extremely bitter taste, has been used for thousands of years to treat febrile illnesses, infections, and inflammatory conditions. In modern phytotherapy, it has become one of the most extensively studied herbal remedies for respiratory infections.
The product contains a fixed combination of a standardized extract of Andrographis paniculata herb (SHA-10) and Eleutherococcus senticosus root extract. The andrographolide compounds in Andrographis paniculata are the primary bioactive constituents responsible for the product's therapeutic effects. These compounds have been shown to modulate the immune system by enhancing both innate and adaptive immune responses.
Kan Jang is classified as a traditional herbal medicinal product in the European Union under the Traditional Herbal Registration Directive (2004/24/EC). This classification is based on long-standing traditional use and supportive clinical evidence. The European Medicines Agency (EMA) Committee on Herbal Medicinal Products (HMPC) has issued a community herbal monograph on Andrographis paniculata recognizing its traditional use for the relief of common cold symptoms.
How Does Kan Jang Work?
The primary active compound in Kan Jang is andrographolide, a diterpenoid lactone extracted from the leaves and aerial parts of Andrographis paniculata. Andrographolide exerts its therapeutic effects through several interconnected mechanisms:
- Immunomodulation: Andrographolide enhances the activity of natural killer (NK) cells, macrophages, and lymphocytes, which are key components of the body's immune defense against viral infections. It stimulates phagocytic activity, helping the body to more efficiently clear invading pathogens.
- Anti-inflammatory effects: The compound inhibits the NF-κB signaling pathway, a master regulator of inflammatory responses. By reducing excessive inflammation in the upper respiratory tract, it helps alleviate symptoms such as sore throat, nasal congestion, and cough.
- Antiviral activity: Laboratory studies have demonstrated that andrographolide can inhibit the replication of several respiratory viruses, including rhinoviruses and influenza viruses, by interfering with viral entry and replication pathways.
- Antipyretic properties: Andrographolide can help reduce fever associated with upper respiratory infections by modulating prostaglandin synthesis through inhibition of cyclooxygenase-2 (COX-2).
The addition of Eleutherococcus senticosus (Siberian ginseng) provides complementary adaptogenic effects, supporting the body's general resistance to stress and infection. Eleutherococcus contains eleutherosides that have been shown to enhance immune cell function and improve overall resilience during illness.
A Cochrane systematic review analyzing data from randomized controlled trials found that Andrographis paniculata preparations, including Kan Jang, were significantly more effective than placebo in reducing the severity of overall cold symptoms, particularly cough and sore throat. The review included over 1,000 participants across multiple trials and found the evidence to be of moderate to good quality.
Primary Indications
Kan Jang is primarily indicated for the symptomatic relief of the following conditions:
- Common cold: Reducing the severity and duration of typical cold symptoms including sore throat, runny nose, nasal congestion, sneezing, headache, and malaise
- Uncomplicated upper respiratory tract infections: Supporting recovery from mild to moderate viral infections of the nose, sinuses, pharynx, and larynx
- Pharyngitis and sore throat: Alleviating throat pain and inflammation associated with viral upper respiratory infections
It is important to note that Kan Jang is intended for the relief of symptoms only and does not treat the underlying viral infection directly. It should not be used as a substitute for medical treatment when antibiotics or other prescription medications are indicated, such as in cases of bacterial infection.
What Should You Know Before Taking Kan Jang?
Before taking Kan Jang, be aware that it is contraindicated during pregnancy and breastfeeding, in children under 12 years, and in individuals with autoimmune disorders. It may interact with anticoagulants, immunosuppressants, and antihypertensive drugs. Always consult a healthcare provider if you have any underlying health conditions.
While Kan Jang is available without a prescription and is generally well tolerated, there are important considerations that should be taken into account before starting treatment. As with any herbal medicinal product, individual responses can vary, and certain populations may be at higher risk of adverse effects or interactions.
Contraindications
Kan Jang should not be used by the following groups:
- Pregnant women: Andrographis paniculata has demonstrated anti-fertility and uterine-stimulating effects in animal studies. Due to a lack of adequate safety data in human pregnancy, it is contraindicated during all trimesters of pregnancy.
- Breastfeeding women: It is not known whether andrographolide or its metabolites are excreted in breast milk. As a precautionary measure, use during breastfeeding is not recommended.
- Children under 12 years: Insufficient safety and efficacy data are available for pediatric use. The product should not be given to children under 12 years of age.
- Known hypersensitivity: Individuals with known allergy to Andrographis paniculata, Eleutherococcus senticosus, or any other component of the product should not use it.
- Autoimmune disorders: Because andrographolide can stimulate immune function, patients with autoimmune conditions such as rheumatoid arthritis, systemic lupus erythematosus, multiple sclerosis, or other autoimmune diseases should avoid this product, as it may theoretically exacerbate disease activity.
Warnings and Precautions
The following precautions should be observed when taking Kan Jang:
- Duration of use: Do not take Kan Jang for more than 7 consecutive days. If symptoms persist beyond this period, worsen during treatment, or are accompanied by high fever (above 39°C/102.2°F), persistent headache, or difficulty breathing, discontinue use and consult a healthcare professional.
- Liver function: Rare cases of hepatotoxicity have been reported with Andrographis paniculata products. Patients with pre-existing liver disease or those taking other hepatotoxic medications should exercise caution and consult their healthcare provider before use.
- Blood disorders: Andrographis paniculata may have mild antiplatelet effects. Patients with bleeding disorders or those scheduled for surgery should inform their surgeon and consider discontinuing use at least 2 weeks before the procedure.
- Fertility: Animal studies have suggested potential anti-fertility effects of Andrographis paniculata, particularly on spermatogenesis. Couples actively trying to conceive should be informed of this potential risk.
- Allergic reactions: While rare, allergic reactions including skin rash, urticaria, and allergic reactions have been reported. Discontinue use immediately if signs of an allergic reaction develop.
Pregnancy and Breastfeeding
Kan Jang is contraindicated during pregnancy and breastfeeding. This recommendation is based on the following evidence:
Animal reproductive toxicity studies have shown that Andrographis paniculata can cause termination of pregnancy in mice at high doses and may have uterine-stimulating properties. While these effects were observed at doses considerably higher than typical therapeutic doses in humans, the absence of adequate human safety data means the product cannot be recommended during pregnancy.
No human studies have investigated the excretion of andrographolide or its metabolites in breast milk. Given the lack of data and the potential pharmacological activity of the compound, breastfeeding women should avoid using Kan Jang and consult their healthcare provider for alternative treatments for cold symptoms.
Women of childbearing potential should be aware that some animal data suggest potential effects on fertility. If pregnancy is planned, it may be advisable to discuss the use of Andrographis paniculata products with a healthcare provider.
Do not use Kan Jang during pregnancy. Animal studies have shown potential uterine-stimulating effects. If you discover you are pregnant while taking Kan Jang, discontinue use immediately and consult your healthcare provider.
How Does Kan Jang Interact with Other Drugs?
Kan Jang may interact with anticoagulants (such as warfarin), antiplatelet drugs, immunosuppressants, and antihypertensive medications. The andrographolide in Kan Jang has mild blood-thinning and blood pressure-lowering effects, which may enhance the action of these medications. Always inform your healthcare provider about all herbal products you are taking.
Drug interactions with herbal medicinal products can be clinically significant and are often underrecognized. Andrographis paniculata has several pharmacological properties that can potentially interact with commonly prescribed medications. The mechanisms of interaction include both pharmacokinetic interactions (affecting drug absorption, distribution, metabolism, and elimination) and pharmacodynamic interactions (additive or antagonistic therapeutic effects).
Major Interactions
The following interactions are considered potentially significant and may require dose adjustment, close monitoring, or avoidance of concurrent use:
| Drug Class | Examples | Interaction Effect | Clinical Significance |
|---|---|---|---|
| Anticoagulants | Warfarin, acenocoumarol, heparin | Increased risk of bleeding due to additive antiplatelet effects | High – Monitor INR closely, consider avoiding concurrent use |
| Antiplatelet drugs | Aspirin, clopidogrel, ticagrelor | Additive inhibition of platelet aggregation, increased bleeding risk | High – Avoid concurrent use or monitor for signs of bleeding |
| Immunosuppressants | Ciclosporin, tacrolimus, azathioprine | Andrographolide may counteract immunosuppressive effects by stimulating immune function | High – Avoid concurrent use; may compromise immunosuppressive therapy |
| Antihypertensives | ACE inhibitors, ARBs, calcium channel blockers | Additive blood pressure-lowering effect; risk of hypotension | Moderate – Monitor blood pressure; adjust doses if necessary |
Minor Interactions
The following interactions are considered to be of lower clinical significance but should still be noted:
| Drug Class | Examples | Interaction Effect | Clinical Significance |
|---|---|---|---|
| CYP450 substrates | Various (CYP1A2, CYP2C9) | Andrographolide may modulate CYP450 enzyme activity in vitro; clinical relevance uncertain | Low – Monitor for altered drug effects with narrow therapeutic index drugs |
| Antidiabetic agents | Metformin, sulfonylureas, insulin | Potential additive hypoglycemic effect | Low – Monitor blood glucose; risk is theoretical and uncommon at normal doses |
| Other herbal products | Garlic, ginkgo, ginger supplements | Additive antiplatelet effects when combined with herbs that also affect platelet function | Low to moderate – Avoid combining multiple supplements with antiplatelet activity |
Always tell your doctor, pharmacist, or healthcare provider about all herbal products, dietary supplements, and over-the-counter medications you are taking. Drug-herb interactions are frequently overlooked and can have clinically significant consequences. Keep an up-to-date list of all your medications and supplements.
What Is the Correct Dosage of Kan Jang?
The recommended adult dosage of Kan Jang oral solution varies by product formulation. Generally, treatment involves taking the oral solution three times daily with meals. Treatment should begin at the first sign of cold symptoms and should not exceed 7 consecutive days. Follow the specific dosage instructions on the product packaging.
The dosage of Kan Jang may vary depending on the specific product formulation and the concentration of the active extract. It is essential to follow the dosage instructions provided on the product packaging or as directed by a healthcare professional. The following guidelines represent general recommendations based on the standardized extract formulation.
Adults
Adults and Adolescents (12 years and older)
The standard recommended dose of Kan Jang oral solution for adults is to take the product three times daily, typically with or after meals to minimize the risk of gastrointestinal discomfort. The exact volume per dose depends on the concentration of the specific formulation.
Treatment should be initiated at the very first sign of cold symptoms (such as a scratchy throat, mild nasal congestion, or general malaise) for optimal effectiveness. Clinical trials have shown that earlier initiation of treatment correlates with greater symptom reduction. The maximum duration of continuous treatment is 7 days.
Children
Children Under 12 Years
Kan Jang is not recommended for children under 12 years of age due to insufficient safety and efficacy data in this population. Parents or caregivers should consult a pediatrician for appropriate alternative treatments for cold symptoms in younger children.
For adolescents aged 12 to 17 years, the adult dose may be used, but parental supervision is advised. If in doubt, consult a healthcare professional before administering the product to adolescents.
Elderly
Elderly Patients (65 years and older)
No specific dose adjustment is generally required for elderly patients. However, elderly individuals are more likely to be taking multiple medications and may have age-related changes in liver and kidney function that could affect drug metabolism. Elderly patients should consult their healthcare provider before use, especially if they are taking anticoagulants, antihypertensives, or other medications that may interact with Kan Jang.
Missed Dose
If you miss a dose of Kan Jang, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a forgotten one. Consistent dosing throughout the day is important for maintaining therapeutic levels of the active compounds.
Overdose
No cases of serious overdose with Kan Jang have been reported in the medical literature. However, ingestion of significantly higher than recommended doses may lead to increased gastrointestinal side effects such as nausea, vomiting, diarrhea, and abdominal pain. In very high doses, Andrographis paniculata may theoretically cause more pronounced hypotension and increased bleeding risk.
If you suspect an overdose, contact your local poison control center or seek medical attention. There is no specific antidote for Andrographis paniculata overdose; treatment is supportive and based on symptoms.
Start treatment at the first sign of cold symptoms – the earlier you begin, the more effective the treatment is likely to be. Take the oral solution with food to reduce the chance of stomach upset. Due to the extremely bitter taste of Andrographis extract, you may find it helpful to mix the solution with a small amount of juice or water. Shake the bottle well before each use.
What Are the Side Effects of Kan Jang?
Kan Jang is generally well tolerated. The most common side effects are gastrointestinal symptoms including nausea, diarrhea, and abdominal discomfort. Allergic skin reactions such as rash and urticaria occur uncommonly. Rare side effects include fatigue, headache, and altered taste perception. Serious adverse effects are very rare.
Like all medicines, including herbal medicinal products, Kan Jang can cause side effects, although not everybody gets them. The overall safety profile of Andrographis paniculata preparations is considered favorable, with most adverse effects being mild and self-limiting. In clinical trials, the incidence of side effects with Kan Jang was comparable to or only slightly higher than that observed with placebo.
The following side effects have been reported with Kan Jang and other Andrographis paniculata preparations in clinical trials and post-marketing surveillance. They are categorized by frequency according to the standard medical convention:
Common
May affect up to 1 in 10 people
- Nausea
- Diarrhea or loose stools
- Abdominal discomfort or mild stomach pain
- Bitter or metallic taste in the mouth
- Loss of appetite
Uncommon
May affect up to 1 in 100 people
- Skin rash or itching
- Urticaria (hives)
- Headache
- Fatigue or drowsiness
- Dizziness
- Vomiting
Rare
May affect up to 1 in 1,000 people
- Elevated liver enzymes (transient)
- Anaphylactic-like reactions
- Swollen lymph nodes
- Changes in blood pressure (hypotension)
- Heart palpitations
Most gastrointestinal side effects are related to the extremely bitter taste of the Andrographis extract and tend to diminish with continued use or when taken with food. The bitter taste stimulates gastric secretion, which can cause mild nausea or stomach discomfort in some individuals.
When to Stop Taking Kan Jang
You should stop taking Kan Jang and seek medical advice immediately if you experience any of the following:
- Signs of a severe allergic reaction (difficulty breathing, swelling of the face, lips, tongue, or throat, severe skin rash)
- Yellowing of the skin or eyes (jaundice), dark urine, or persistent abdominal pain, which may indicate liver problems
- Unusual bruising or bleeding, which may indicate effects on blood clotting
- Symptoms of severe hypotension such as feeling faint, severe dizziness, or confusion
If you experience any side effects, talk to your doctor, pharmacist, or healthcare professional. This includes any possible side effects not listed in this guide. You can also report side effects directly to your national medicines regulatory authority. By reporting side effects, you can help provide more information on the safety of this medicine.
How Should You Store Kan Jang?
Store Kan Jang at room temperature (below 25°C/77°F), away from direct sunlight and moisture. Keep the bottle tightly closed after use. Do not freeze. Once opened, use within the timeframe specified on the packaging. Keep out of the reach and sight of children.
Proper storage of Kan Jang is essential to maintain the potency and safety of the active ingredients. Herbal liquid preparations can be particularly sensitive to environmental conditions, and improper storage may lead to degradation of the active compounds or microbial contamination.
Follow these storage guidelines to ensure the product remains effective throughout its shelf life:
- Temperature: Store at room temperature, ideally below 25°C (77°F). Do not expose to extreme heat or cold. Do not refrigerate unless specifically instructed on the product label, as this may cause precipitation of active compounds.
- Light protection: Keep the bottle in its original packaging to protect from direct sunlight. Andrographolide compounds can degrade when exposed to prolonged light.
- Moisture: Store in a dry environment. Do not keep in the bathroom or near sources of humidity.
- Seal: Always replace the cap tightly after each use to prevent evaporation and contamination.
- After opening: Once the bottle has been opened, use the contents within the timeframe specified by the manufacturer (typically 3–6 months). Note the date of opening on the label.
- Expiry date: Do not use Kan Jang after the expiry date printed on the label and carton. The expiry date refers to the last day of that month.
- Children: Keep out of the reach and sight of children. Store in a locked medicine cabinet if possible.
Do not dispose of Kan Jang via wastewater or household waste. Ask your pharmacist how to dispose of medicines you no longer use. These measures help to protect the environment.
What Does Kan Jang Contain?
Kan Jang contains a standardized extract of Andrographis paniculata herb (SHA-10) as the primary active ingredient, combined with Eleutherococcus senticosus root extract. The key bioactive compound is andrographolide, a diterpenoid lactone responsible for the product's immunomodulatory and anti-inflammatory effects.
Active Ingredients
The primary active constituents of Kan Jang include:
- Andrographis paniculata herb extract (SHA-10): This is a proprietary standardized extract derived from the aerial parts (leaves and stems) of Andrographis paniculata. It is standardized to contain a specific concentration of andrographolides, which are the primary bioactive compounds. The extraction process ensures consistent potency and quality across batches.
- Eleutherococcus senticosus root extract: Also known as Siberian ginseng, this adaptogenic herb contains bioactive compounds called eleutherosides. It provides supportive effects on the immune system and general resilience to physical and mental stress.
Key Bioactive Compounds
The therapeutic activity of Kan Jang is attributed primarily to the following compounds found in Andrographis paniculata:
- Andrographolide: The most abundant and pharmacologically active diterpenoid lactone, responsible for the majority of the plant's immunomodulatory, anti-inflammatory, and antiviral effects.
- 14-deoxyandrographolide: A related diterpenoid with similar but less potent biological activity.
- Neoandrographolide: A glycosidic derivative contributing to anti-inflammatory effects.
- Dehydroandrographolide: Another active diterpene with demonstrated anti-inflammatory properties.
Excipients
The oral solution formulation may contain the following inactive ingredients (excipients). The exact composition may vary by manufacturer:
- Purified water
- Ethanol (as preservative and solvent)
- Glycerol
- Sorbitol or other sweetening agents to mask the bitter taste
- Flavorings
If you have any known allergies or intolerances to specific excipients, check the detailed ingredient list on the product packaging or consult your pharmacist before use. Patients with alcohol sensitivity should note that oral solutions may contain a small amount of ethanol.
Frequently Asked Questions About Kan Jang
Kan Jang is a traditional herbal medicinal product used for the relief of symptoms of the common cold and uncomplicated upper respiratory tract infections. It contains a standardized extract of Andrographis paniculata, which has been shown in clinical trials to reduce the duration and severity of cold symptoms such as sore throat, nasal congestion, runny nose, and cough. It is intended for short-term use only (up to 7 days) and should be started as early as possible after symptom onset.
Clinical studies indicate that Kan Jang can begin to reduce cold symptoms within 2 to 3 days of starting treatment. Most patients experience significant improvement by day 3, with symptom severity being notably lower compared to placebo groups. For best results, treatment should be started as early as possible after the onset of symptoms, ideally within the first 24 to 48 hours.
Kan Jang may interact with anticoagulants (blood thinners like warfarin), antiplatelet medications, immunosuppressants, and antihypertensive drugs. Andrographis paniculata has mild antiplatelet and blood pressure-lowering effects, so concurrent use with medications in these categories should be discussed with a healthcare professional. Always inform your doctor about all supplements and herbal products you are taking.
No. Kan Jang should not be used during pregnancy or breastfeeding. Animal studies have shown that Andrographis paniculata may have anti-fertility and uterine-stimulating effects. Due to a lack of safety data in humans, it is contraindicated during pregnancy and lactation. Women who are pregnant or breastfeeding should consult their healthcare provider for alternative treatments for cold symptoms.
Kan Jang has been evaluated in multiple randomized, double-blind, placebo-controlled clinical trials involving over 1,000 participants. A Cochrane review and meta-analysis of Andrographis paniculata preparations found statistically significant improvements in cough severity, sore throat, and overall cold symptoms. The European Medicines Agency (EMA) has issued a monograph recognizing its traditional use for upper respiratory infections.
Kan Jang is intended for short-term use only. It should not be taken for more than 7 consecutive days without consulting a healthcare professional. If symptoms persist beyond 7 days or worsen during treatment, you should stop taking it and seek medical advice. It is not intended for long-term use or as a preventive supplement.
References
- Coon JT, Ernst E. Andrographis paniculata in the treatment of upper respiratory tract infections: a systematic review of safety and efficacy. Planta Medica. 2004;70(4):293-298. doi:10.1055/s-2004-818938
- Hu XY, Wu RH, Logue M, et al. Andrographis paniculata (Chuan Xin Lian) for symptomatic relief of acute respiratory tract infections in adults and children: A systematic review and meta-analysis. PLoS One. 2017;12(8):e0181780. doi:10.1371/journal.pone.0181780
- Poolsup N, Suthisisang C, Prathanturarug S, Asawamekin A, Chanchareon U. Andrographis paniculata in the symptomatic treatment of uncomplicated upper respiratory tract infection: systematic review of randomized controlled trials. Journal of Clinical Pharmacy and Therapeutics. 2004;29(1):37-45.
- European Medicines Agency (EMA). Community herbal monograph on Andrographis paniculata Nees, herba. Committee on Herbal Medicinal Products (HMPC). EMA/HMPC/320433/2012.
- Saxena RC, Singh R, Kumar P, et al. A randomized double blind placebo controlled clinical evaluation of extract of Andrographis paniculata (KalmCold) in patients with uncomplicated upper respiratory tract infection. Phytomedicine. 2010;17(3-4):178-185.
- Gabrielian ES, Shukarian AK, Goukasova GI, et al. A double blind, placebo-controlled study of Andrographis paniculata fixed combination Kan Jang in the treatment of acute upper respiratory tract infections including sinusitis. Phytomedicine. 2002;9(7):589-597.
- Caceres DD, Hancke JL, Burgos RA, Sandberg F, Wikman GK. Use of visual analogue scale measurements (VAS) to assess the effectiveness of standardized Andrographis paniculata extract SHA-10 in reducing the symptoms of common cold. Phytomedicine. 1999;6(4):217-223.
- World Health Organization (WHO). WHO Monographs on Selected Medicinal Plants – Volume 2: Herba Andrographidis. Geneva: WHO; 2002.
- European Scientific Cooperative on Phytotherapy (ESCOP). ESCOP Monographs: Andrographidis herba. 2nd ed. Stuttgart: Thieme; 2009.
- Burgos RA, Hancke JL, Bertoglio JC, et al. Efficacy of an Andrographis paniculata composition for the relief of rheumatoid arthritis symptoms: a prospective randomized placebo-controlled trial. Clinical Rheumatology. 2009;28(8):931-946.
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Specialists in clinical pharmacology, phytotherapy, and evidence-based medicine. All content follows international guidelines from WHO, EMA, and ESCOP.
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Evidence Standard: This article is based on peer-reviewed clinical trials, systematic reviews, and international medical guidelines (WHO, EMA HMPC, ESCOP). Evidence level: 1A (systematic reviews of randomized controlled trials). No commercial funding or pharmaceutical sponsorship.