Psyllium
PlantaginaceaePlantago ovata
Also known as: Ispaghula, Blond Plantago, Isabgol
clinical_notes Clinical Summary
Psyllium (Plantago ovata) husk is a water-soluble fiber source producing a viscous arabinoxylan gel when hydrated.
It is a first-line agent for chronic constipation and IBS, with robust meta-analytic evidence (Jovanovski 2018, 28 RCTs) showing LDL-C reduction of ~0.33 mmol/L at 10g/day, and FDA-approved health claims for cardiovascular risk reduction.
Safety is excellent with adequate fluid intake; the main concerns are esophageal/GI obstruction with dysphagia and reduced absorption of co-administered medications.
Pregnancy Safety
Considered safe in pregnancy and first-line for pregnancy-associated constipation. Not systemically absorbed.
Lactation Safety
Safe in lactation. Not systemically absorbed; no transfer to breast milk.
warning Contraindications
- Gastrointestinal obstruction, stricture, or impaction (contraindicated)Clinically Proven
- Dysphagia / swallowing disorders (contraindicated)Clinically Proven
- Concurrent oral medications (caution)Clinically Proven
- Psyllium/plantago allergy (contraindicated)Clinically Proven
vital_signs Clinical Profile
Primary Indications
- check_circle chronic constipation
- check_circle IBS
- check_circle hemorrhoids
- check_circle hypercholesterolemia
- check_circle type 2 diabetes
- check_circle diarrhea (via stool-bulking)
Therapeutic Actions
System Affinities
- check_circle large intestine
- check_circle cardiovascular system
- check_circle digestive tract
labs Active Constituents
arabinoxylans
cellulose
mucilage polysaccharides
iridoid glycosides
phenolic compounds
history_edu Traditional Use
Traditional Chinese Medicine (TCM)
车前子 (Che Qian Zi)
Nature: cool
- promotes urination
- clears damp-heat
- eye brightening
- stops diarrhea
Plantago ovata is not classical; classical TCM Che Qian Zi refers to Plantago asiatica/depressa seeds with overlapping but not identical applications. P. ovata is used in modern TCM practice as substitute.
Traditional Uses Across Healing Systems
While many herbs lack controlled clinical trials, centuries of traditional practice across cultures provide valuable insight into their therapeutic applications.
Isabgol — Used for chronic dysentery, diarrhea, constipation, and to soothe inflamed mucous membranes.
India remains the primary global producer of psyllium husk.
Used as a cooling demulcent for dysentery, diarrhea, and urinary tract inflammation.
Persian/Arabic isabgol means horse ear referring to seed shape.
Bulk-forming laxative, fiber supplement, cholesterol reduction.
FDA-approved health claim (1998) for reducing CHD risk via soluble fiber.
spa Parts Used
seed husk
- constipation
- hypercholesterolemia
- IBS
- diarrhea
Husk is mechanically separated from seed by milling. Whole seed has additional insoluble fiber and mild laxative action; husk alone is more demulcent/lipid-lowering.
seed (whole)
- constipation
- bulk-forming stool regulation
Whole seed; soak before ingestion. Contains 30% soluble fiber by weight.
shield Safety
Contraindications — Evidence Basis
Gastrointestinal obstruction, stricture, or impaction
Bulk-forming fiber can worsen obstruction; cases of esophageal and intestinal obstruction reported with inadequate water intake.
Dysphagia / swallowing disorders
Risk of esophageal obstruction; FDA requires take with adequate fluid warning.
Concurrent oral medications
Psyllium can bind and reduce absorption of lithium, digoxin, tetracyclines, iron, and other drugs; separate by 2-4 hours.
Psyllium/plantago allergy
Documented anaphylaxis from inhalation (occupational) or ingestion in sensitized individuals.
Monitoring Parameters
Monitor during use, especially with prolonged or high-dose therapy.
Lipid panel (LDL, non-HDL, apoB)
Baseline and at 3 monthsMonitor lipid-lowering response; meta-analysis shows ~13 mg/dL LDL reduction at 10 g/day
flagThreshold: No response after 12 weeks: reassess dosing or adherence
Toxicity
No systemic toxicity. GI obstruction risk with inadequate fluid intake.
Esophageal or intestinal obstruction, abdominal cramping, bloating.
Fluid resuscitation; endoscopic removal if esophageal obstruction; bowel rest and possible surgical consultation for impaction.
Adverse Effects
CYP Metabolism
Not systemically absorbed; no direct CYP effects. Reduces absorption of co-administered oral drugs via physical binding — administer other medications 2 hours before or 4 hours after psyllium.
swap_horiz Interactions
Lithium carbonate
Class: Mood stabilizer
Psyllium (ispaghula) husk's viscous mucilage binds lithium in the gastrointestinal tract, markedly reducing absorption. A published case report documented sub-therapeutic lithium levels that normalized when psyllium was withdrawn.
Administer lithium at least 1–2 hours before or 2 hours after psyllium. Check serum lithium within 1 week of starting/stopping psyllium and adjust dose to maintain 0.6–1.2 mEq/L.
Levothyroxine
Class: Thyroid hormone
Soluble fibre in psyllium increases gastrointestinal viscosity and binds levothyroxine, reducing its absorption and potentially elevating TSH in hypothyroid patients.
Take levothyroxine on an empty stomach ≥4 hours apart from psyllium. Re-check TSH 6–8 weeks after starting psyllium and adjust thyroxine dose.
Carbamazepine
Class: Anticonvulsant
Psyllium accelerates GI transit and viscous gel entraps lipophilic carbamazepine, reducing Cmax and AUC; reduced absorption can precipitate breakthrough seizures in epilepsy patients.
Separate carbamazepine from psyllium by ≥2 hours. If psyllium is introduced in a stabilized patient, check trough carbamazepine level within 2 weeks and monitor for seizure activity.
Digoxin
Class: Cardiac glycoside
Ispaghula husk reduces bioavailability of digoxin in geriatric patients by slowing gastric emptying and binding the drug in the lumen; effect is most pronounced with digoxin capsules/elixir.
Give digoxin at least 2 hours before or 4 hours after psyllium; monitor serum digoxin trough and clinical response.
Olanzapine (orally disintegrating)
Class: Atypical antipsychotic
Case report of blunted clinical effect of orally disintegrating olanzapine when co-administered with psyllium; the fibre gel entraps the rapidly dissolving tablet in the mouth/oesophagus, reducing pre-gastric absorption.
Dose olanzapine ≥1 hour before psyllium; prefer standard tablets over orally disintegrating formulations in patients using bulk-forming fibre.
Warfarin
Class: Anticoagulant
Ispaghula (and other bulk fibres) can modestly decrease warfarin absorption by binding in the gut; clinically the effect is small and often counterbalanced by improved bowel regularity stabilizing vitamin-K intake.
Separate warfarin dosing from psyllium by ≥2 hours. Re-check INR within 1–2 weeks of initiating psyllium and adjust warfarin accordingly.
hub Combinations
Synergistic pairings can enhance therapeutic outcomes, while knowing suitable substitutes helps when specific herbs are unavailable or contraindicated.
Synergistic Combinations
4Fennel
Traditional UseFennel's carminative action reduces bloating that can accompany psyllium initiation.
Traditional combination for digestive formulas.
Marshmallow Root
Traditional UseMarshmallow mucilage soothes irritated GI mucosa while psyllium provides bulk — classic combination for diverticulitis/colitis recovery.
Traditional combination; limited controlled data.
Senna
Moderate EvidencePsyllium bulks the stool while senna stimulates peristalsis; combination suits mixed-type chronic constipation.
Used in Agiolax and similar commercial preparations.
Slippery Elm
Limited EvidenceBoth demulcent fibers; slippery elm adds tissue-soothing mucilage to psyllium's bulking action for IBS and constipation.
Common combination in digestive formulas; limited RCT evidence of combination.
science Studies
Plantago consumption significantly reduces total cholesterol and low-density lipoprotein cholesterol in adults: A systematic review and meta-analysis
Meta-AnalysisThis systematic review and meta-analysis pooled data from 29 randomised controlled trials (2,769 participants) examining Plantago (psyllium/ovata) supplementation on blood lipids. Plantago consumption significantly reduced total cholesterol by 0.28 mmol/L and LDL-cholesterol by 0.35 mmol/L compared to control, equating to an estimated 7% decrease in cardiovascular event risk. No substantial effects were observed on HDL cholesterol or triglycerides overall, though soluble fiber subgroups did show triglyceride reductions. Psyllium husk and psyllium forms were among the most effective preparations. The results strongly support dietary use of psyllium-containing Plantago products for lipid management.
Effects of a Plantago ovata-based herbal compound in prevention and treatment of oral mucositis in patients with breast cancer receiving chemotherapy: A double-blind, randomized, controlled crossover trial
RCTThis double-blind, randomised, controlled crossover trial assessed a herbal mouthwash based on Plantago ovata mucilage (500 mg husk in 30 mL water with vinegar) in 28 breast cancer patients who developed oral mucositis during adriamycin-containing chemotherapy. Patients were randomised to herbal compound or placebo mouthwash (3 times daily) during their next chemo cycle. Both the oral care protocol and the P. ovata-based mouthwash were effective for preventing and treating oral mucositis compared to no treatment. The study suggests P. ovata as a practical, low-cost option for managing chemotherapy-induced oral mucositis.
medication Dosing
powder
5-10 g husk (approximately 1-2 tsp) mixed in 240 mL water
1-3x/day
Take with plenty of water. Titrate up slowly. Separate from medications by 2-4 hours.
capsule
2-4 capsules (approximately 1 g psyllium each)
1-3x/day with full glass of water
Higher pill burden; must take with adequate water to prevent esophageal obstruction.
tea
5-10 g whole seed soaked in 240 mL cold water
1-2x/day
Allow 15-30 min soaking before drinking. Gentler demulcent preparation.
Disclaimer: This information is largely AI-generated and reviewed by human experts at Evara Health. It is intended for educational and clinical reference purposes only and should not replace professional medical advice.
© 2026 Evara Health. All rights reserved.