What is Otsujito (Kampo)?

Otsujito is a six-herb Kampo formula with roots in classical Chinese medicine that became deeply embedded in Japanese medical practice. It is arguably the most widely prescribed Kampo formula specifically for anorectal conditions, including internal and external hemorrhoids, anal fissures, rectal prolapse, and bleeding. The formula has been used in Japan for several centuries and remains a standard treatment option in modern Japanese gastroenterology and colorectal surgery clinics.

How does Otsujito (Kampo) work?

The formula works through several complementary actions: Angelica root nourishes blood and softens tissues, Bupleurum root lifts prolapsed tissue and reduces inflammation, Rhubarb gently stimulates bowel movement to relieve straining, Licorice soothes irritated mucous membranes, Cimicifuga assists with lifting and anti-inflammatory effects, and Schizonepeta calms itching and surface inflammation. Together they address both the underlying stagnation and the surface symptoms that drive hemorrhoid discomfort.

What forms does Otsujito (Kampo) come in?

In Japan, Otsujito is almost universally dispensed as a standardized granule extract (kanpo-extract granules) — patients dissolve the granules in hot water and drink as a tea before meals. Tablets and ready-to-drink preparations are also available from major Japanese Kampo manufacturers such as Tsumura and Kotaro. Traditional decoction (boiling whole herbs) is the classical preparation but is rarely used outside specialist settings today.

Where it comes from:

The formula originates from Japanese folk medicine of the Edo period (17th–19th century) and is attributed to the physician Kishimoto Soushi. Unlike many Kampo formulas that are direct adaptations of Chinese classics, Otsujito is considered a genuinely Japanese Kampo creation, tailored to the Japanese dietary pattern and constitution. It gained official recognition and is now listed in Japan's national health insurance drug tariff, making it reimbursable and widely accessible.

What does Otsujito (Kampo) help with?

• Hemorrhoids (internal and external): Otsujito is the first-line Kampo treatment for both internal and external hemorrhoids in Japan. It works by reducing swelling and tissue congestion in the anal area while improving stool consistency to reduce the straining that worsens hemorrhoids. Many patients experience meaningful reduction in pain and swelling within two to four weeks.
• Anal bleeding: Bleeding from hemorrhoids is one of the most common reasons patients are prescribed Otsujito. The formula helps tone inflamed and fragile rectal blood vessels, and its combination of anti-inflammatory herbs reduces the irritation that triggers bleeding. Improvement in bleeding is often among the first symptoms to resolve.
• Rectal prolapse: The Bupleurum and Cimicifuga herbs in the formula have a classical 'lifting' action in Kampo theory, and clinical use supports their benefit for mild prolapsed hemorrhoids. This makes Otsujito particularly suited for internal hemorrhoids that prolapse during bowel movements.
• Anal itching and discomfort: Schizonepeta in the formula helps calm surface inflammation and itching around the anal area. This is especially helpful for people dealing with chronic anal irritation that disrupts daily comfort and sleep.
• Anal fissures: By softening stools through rhubarb's gentle laxative action and soothing irritated mucosal tissue with licorice, Otsujito supports healing of anal fissures and reduces the pain associated with bowel movements.
• Constipation-related straining: Rhubarb root in the formula promotes gentle, softer bowel movements without the urgency of stronger laxatives. Reducing straining is key to preventing hemorrhoid flares and allowing existing hemorrhoids to heal.
• Post-surgical anorectal recovery: Japanese colorectal surgeons commonly prescribe Otsujito alongside conventional care after hemorrhoidectomy or banding procedures. It helps manage residual swelling, supports tissue healing, and keeps stools soft during recovery.
• Mild rectal inflammation: The anti-inflammatory combination of licorice, angelica, and bupleurum helps calm mild inflammatory changes in the rectal lining, making the formula useful for general anorectal discomfort even outside a clear hemorrhoid diagnosis.

What can Otsujito (Kampo) help prevent?

• Hemorrhoid recurrence with ongoing maintenance use
• Constipation-related progression of anorectal conditions

Which foods are rich in Otsujito (Kampo)?

Otsujito is a multi-herb formula and not found in food. To support the same goals — healthy veins, soft stools, and reduced anal inflammation — prioritize: (1) High-fiber foods like oats, psyllium husk, lentils, and leafy greens to keep stools soft and reduce straining; (2) Fermented foods like miso, natto, and kimchi for gut motility and microbiome balance; (3) Dark berries (blueberries, bilberries, cherries) for anthocyanins that strengthen blood vessel walls and reduce vascular inflammation; (4) Flaxseed and chia seeds for soluble fiber and anti-inflammatory omega-3s; (5) Stay well-hydrated — adequate water intake is foundational for stool softness. Foods to limit: spicy foods, alcohol, and excessive refined carbohydrates can worsen anal inflammation and hemorrhoid symptoms.

What are the side effects of Otsujito (Kampo)?

• Loose stools or mild diarrhea (from rhubarb: reduce dose if this occurs)
• Stomach discomfort or nausea, particularly on an empty stomach
• Skin rash or allergic reaction (rare, but possible with any herbal formula)
• Fluid retention or elevated blood pressure with prolonged use (due to licorice — monitor in those prone to hypertension)
• Low potassium (with very long-term or high-dose use: relevant for those on diuretics)
• Liver enzyme elevation (rare; reported with some Kampo formulas — discontinue and consult a doctor if jaundice, fatigue, or abdominal pain develop)

Good to know:

Otsujito has a long history of safe use in Japan and is generally well-tolerated at standard doses. Most side effects are mild and related to the rhubarb or licorice components, and tend to resolve with dose adjustment.

How much Otsujito (Kampo) should you take?

• Recommended daily: Standard Japanese pharmacopoeia dose: 7.5 g/day of Tsumura Otsujito extract granules, taken as 2.5 g three times daily (equivalent to approximately 15 g of the crude herb combination daily). Follow manufacturer instructions for other brands.
• Best time of day: Three times daily — traditionally before meals (about 30 minutes before eating) to maximize absorption and minimize stomach upset.
• With or without food: Classically taken before meals; if stomach upset occurs, taking with or just after a light meal is acceptable.
• Time to effect: Mild symptom relief (bleeding, itching) often within 1–2 weeks; fuller improvement in hemorrhoid size and prolapse typically within 4–8 weeks of consistent use.
• How long to take it: Acute hemorrhoid flares: treat for 4–8 weeks. For recurrent hemorrhoids, ongoing maintenance use is common in Japanese clinical practice. Periodic review with a practitioner is recommended if using beyond 3 months, particularly due to licorice content.