Andrographis: Immune, Anti-Inflammatory, and Antiv…

Andrographis (Andrographis paniculata) is a bitter herb native to South Asia that has been used in Ayurvedic and Traditional Chinese Medicine for upper respiratory infections, fever, and inflammation for centuries. Unlike many immune herbs with weak clinical evidence, andrographis has multiple well-designed randomized controlled trials and a systematic review supporting its efficacy for reducing the severity and duration of uncomplicated upper respiratory infections.

Andrographolide: The Active Compound

The primary bioactive compound is andrographolide, a labdane diterpenoid that accounts for most of the plant's pharmacological activity. Andrographolide inhibits NF-kB transcription through a novel covalent binding mechanism — it alkylates a cysteine residue in the p50 subunit of NF-kB, preventing its nuclear translocation and the subsequent transcription of inflammatory genes including TNF-alpha, IL-1, IL-6, and COX-2.

This direct covalent mechanism is unusual and may explain why andrographolide has dose-dependent but relatively sustained anti-inflammatory effects even at moderate doses.

Upper Respiratory Infection Evidence

A 2017 Cochrane review examined 33 RCTs (7,175 participants) of andrographis for the prevention and treatment of upper respiratory tract infections. The meta-analysis found that andrographis significantly reduced the duration of cough, sore throat, and overall cold symptoms compared to placebo — with symptom duration shortened by approximately 1-2 days. The evidence was graded as moderate quality.

A well-designed Swedish study using Kan Jang (a combination of andrographis and Eleutherococcus senticosus) found that treatment started within 72 hours of symptom onset reduced total symptom score by 55% compared to 31% in the placebo group after 5 days. The andrographis component appears to drive most of the effect.

Antiviral Activity

Andrographolide has demonstrated direct antiviral activity in cell culture studies against multiple respiratory viruses including influenza A and B, adenovirus, and coronavirus strains. The proposed mechanism involves inhibition of viral attachment to host cell surface receptors and downregulation of viral replication machinery. These in vitro effects are strongest when andrographolide is present before viral exposure (prophylactic) rather than after infection, suggesting prevention may be more effective than treatment.

A small Thai clinical trial found that andrographis extract reduced fever duration in dengue fever patients compared to standard care — suggesting antiviral activity beyond simple anti-inflammatory effects, though this requires replication.

Anti-Inflammatory Applications Beyond Colds

Given the NF-kB inhibitory mechanism, andrographis has been studied for chronic inflammatory conditions. A randomized trial in rheumatoid arthritis patients found that andrographis extract (60 mg andrographolide/day) significantly reduced tender joint count and physician global assessment scores versus placebo over 14 weeks. Inflammatory markers (CRP, ESR) also decreased.

Studies in IBD (inflammatory bowel disease) have shown andrographolide reduces intestinal inflammation scores in experimental colitis models and small human trials.

Immune Stimulation

Beyond anti-inflammatory effects, andrographis also enhances innate immune function. It increases NK cell cytotoxicity, promotes macrophage activation, and stimulates interferon production. This combination — stimulating effective immune surveillance while reducing excessive inflammatory damage — is characteristic of an immunomodulator.

Dosage

For acute upper respiratory infections: 400 mg three times daily (standardized to 30-60 mg andrographolide total daily) starting within 24-72 hours of symptom onset, for 3-7 days. For chronic inflammatory conditions: 300-400 mg twice daily of standardized extract (minimum 10% andrographolide). Andrographis is intensely bitter — capsules are strongly preferred over loose powder or tea.

Safety and Interactions

Andrographis is generally well-tolerated for short-term use. The most common adverse effects are GI discomfort and headache at high doses. At therapeutic doses, liver enzyme elevations have been reported rarely. Andrographis has been shown to reduce blood pressure in animal models and may enhance anticoagulant effects — caution with blood pressure medications and warfarin.

Not recommended during pregnancy (traditionally used as an abortifacient in high doses; standard supplement doses are probably safe but insufficient safety data exists).

FAQ

Is andrographis better taken preventively or when sick? Both uses have evidence. The Cochrane review covered treatment; some studies support prevention. Preventive dosing (100-200 mg/day) may be appropriate during cold/flu season; higher doses at onset of illness are better supported for treatment.

What does andrographolide percentage mean on labels? Andrographolide is the marker compound used for standardization. Look for extracts with 10-30% andrographolide. A 400 mg capsule standardized to 10% delivers 40 mg andrographolide — within the clinical range.

Can andrographis be used long-term? Short-term use (under 2 weeks) is well-studied. Long-term safety beyond 3 months is less characterized. Cycling (6-8 weeks on, 2-4 weeks off) is a reasonable approach for ongoing immune support.

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Andrographis: Immune, Anti-Inflammatory, and Antiviral Evidence