ETHAMBUTOL HYDROCHLORIDE 400 mg Tablet, Film Coated, 100-count
🆔 Identity & classification
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🏷️ RxNorm drug class
This medicine belongs to the Antimycobacterial class.
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🏭 Manufacturer & labeler
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🩺 Clinical
Ethambutol eliminates certain bacteria that cause tuberculosis (TB). It is used with other medicines to treat tuberculosis and to prevent you from giving the infection to others. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
Read the full MedlinePlus article ↗- Ethambutol must always be paired with at least one other anti-TB drug — it is not strong enough on its own to clear a TB infection, and using it alone lets the bacteria quickly dev...
- Why do I have to take this with other TB medications? Can't I just take ethambutol alone?
- It's a real risk worth taking seriously. Ethambutol can cause optic neuritis — inflammation of the nerve that connects your eye to your brain — which can lead to blurry vision, tro...
- I heard this medication can affect my eyes. Should I be worried?
Patient education
Supplement & herbal interactions
Ethambutol may be associated with lower levels of 2 nutrients — worth a chat with your pharmacist, not a cause for alarm.
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Ask a licensed pharmacist directly — free, answered by our team.
💊 What it looks like
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🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII 2G86QN327L
Gelatin is a protein derived from animal collagen, commonly used in medicines as a gelling agent and capsule material. It helps create soft or hard capsule shells that hold and release medication, and can also thicken liquid formulations.
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UNII RFW2ET671P
Hydroxypropyl cellulose is a plant-derived thickening agent made from cellulose. It acts as a binder to hold tablet ingredients together and as a film-former to coat tablets or control how fast the medicine releases.
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UNII 70097M6I30
Magnesium stearate is a salt made from magnesium and stearic acid, a fatty substance. It's used in tablets and capsules as a lubricant and glidant to help ingredients flow smoothly during manufacturing and prevent sticking.
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UNII 368GB5141J
A detergent and foaming agent derived from coconut or palm oil. In medications, it helps break down and mix oil and water-based ingredients, aids in tablet disintegration, and improves how the drug dissolves and spreads in the mouth or digestive system.
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UNII 506T60A25R
Sorbitol is a natural sugar alcohol derived from glucose. It serves as a sweetener, humectant, and bulking agent in medications to improve taste and help maintain moisture in the product.
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UNII 4ELV7Z65AP
Stearic acid is a fatty acid derived from plant or animal sources. It acts as a binder and lubricant in tablets and capsules, helping them hold together and flow smoothly during manufacturing.
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UNII C151H8M554
A natural sugar derived from sugar cane or sugar beets. It's used as a sweetener, filler, and binder to improve taste, add bulk, and help hold tablet or capsule ingredients together.
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UNII 15FIX9V2JP
Titanium dioxide is a bright white mineral powder commonly used as a colorant and opacifying agent. It makes pills and tablets white or lighter in color and helps make coatings non-transparent.
8 inactive ingredients listed in the exact product block matched to this NDC.
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ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
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💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per each | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · Q2 2026 | $0.4026 | $40.26 / 100 tablets |
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🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Ethambutol Hydrochloride 400 mg 42806-0102-01 | Epic | 100 tablets | $0.458 | AB | Availability likely | — |
| Ethambutol Hydrochloride 400 mg 68084-0280-01 | American | 100 tablets | $0.458 | AB | Availability likely | — |
| Ethambutol Hydrochloride 400 mg 68180-0281-01 | Lupin | 100 tablets | $0.458 | AB | Availability likely | — |
| Ethambutol Hydrochloride 400 mg 54879-0002-01 | STI | 100 tablets | $0.536 | AB | Discontinued | — |
| Ethambutol Hydrochloride 400 mgthis 10135-0797-01 | Marlex | 100 tablets | — | AB | FDA listed | — |
| Ethambutol Hydrochloride 400 mg 70518-2966-00 | REMEDYREPACK | 30 tablets | — | AB | FDA listed | — |
| Ethambutol Hydrochloride 400 mg 85742-0006-04 | Kanchan | 100 tablets | — | AB | FDA listed | — |
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⏳ Availability & generic status
FDA-approved generic versions are listed, and recent pricing/market data suggests they may be available — see Therapeutic equivalents.
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🔬 Reported adverse events (FAERS)
Top reported reactions
Age at onset
Reporter sex
Serious outcomes
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📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 10135-0797-01 You're viewing this | 100 TABLET, FILM COATED in 1 BOTTLE (10135-797-01) | 2025-08-26 | Active |
🧭 About this NDC listing & data coverage
What data is (and isn’t) available for this NDC — tap to expand
| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | ✓ Available |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | — Not published for this NDC Most self-administered / retail products have no J-code — that is normal. |
| Medicaid utilization (CMS SDUD) | — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold. |
Questions about this listing
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📄 Full prescribing information FDA SPL
🎯 Indications and Usage ▾
INDICATIONS ETHAMBUTOL HCl is indicated for the treatment of pulmonary tuberculosis. It should not be used as the sole antituberculous drug, but should be used in conjunction with at least one other antituberculous drug. Selection of the companion drug should be based on clinical experience, considerations of comparative safety, and appropriate in vitro susceptibility studies.
In patients who have not received previous antituberculous therapy, ie, initial treatment, the most frequently used regimens have been the following: ETHAMBUTOL HCl plus isoniazid ETHAMBUTOL HCl plus isoniazid plus streptomycin. In patients who have received previous antituberculous therapy, mycobacterial resistance to other drugs used in initial therapy is frequent. Consequently, in such retreatment patients, ETHAMBUTOL HCl should be combined with at least one of the second line drugs not previously administered to the patient and to which bacterial susceptibility has been indicated by appropriate in vitro studies.
Antituberculous drugs used with ETHAMBUTOL HCl have included cycloserine, ethionamide, pyrazinamide, viomycin and other drugs. Isoniazid, aminosalicylic acid, and streptomycin have also been used in multiple drug regimens. Alternating drug regimens have also been utilized.
⏱️ Dosage and Administration ▾
DOSAGE and ADMINISTRATION ETHAMBUTOL HCl should not be used alone, in initial treatment or in retreatment. ETHAMBUTOL HCl should be administered on a once every 24-hour basis only. Absorption is not significantly altered by administration with food.
Therapy, in general, should be continued until bacteriological conversion has become permanent and maximal clinical improvement has occurred. ETHAMBUTOL HCl is not recommended for use in pediatric patients under thirteen years of age since safe conditions for use have not been established. Initial Treatment: In patients who have not received previous antituberculous therapy, administer ETHAMBUTOL HCl 15 mg/kg (7 mg/lb) of body weight, as a single oral dose once every 24 hours.
In the more recent studies, isoniazid has been administered concurrently in a single, daily, oral dose. Retreatment: In patients who have received previous antituberculous therapy, administer ETHAMBUTOL HCl 25 mg/kg (11 mg/lb) of body weight, as a single oral dose once every 24 hours. Concurrently administer at least one other antituberculous drug to which the organisms have been demonstrated to be susceptible by appropriate in vitro tests.
Suitable drugs usually consist of those not previously used in the treatment of the patient. After 60 days of ETHAMBUTOL HCl administration, decrease the dose to 15 mg/kg (7mg/lb) of body weight, and administer as a single oral dose once every 24 hours. During the period when a patient is on a daily dose of 25 mg/kg, monthly eye examinations are advised.
See Table for easy selection of proper weight-dose tablet(s). Weight-Dose Table 15 mg/kg (7 mg/Ib) Schedule Weight Range Pounds Dose Kilograms In mg Under 85 lbs Under 37 Kg……….500 85-94.5 37-43…………..600 95-109.5 43-50…………..700 110-124.5 50-57…………..800 125-139.5 57-64…………..900 140-154.5 64-71…………..1000 155-169.5 71-79…………..1100 170-184.5 79-84…………..1200 185-199.5 84-90…………..1300 200-214.5 90-97…………..1400 215 and over Over 97…………..1500 25 mg/kg (11mg/Ib) Schedule Under 85 lbs. Under 38 kg…………..900 85-92.5 38-42…………..1000 93-101.5 42-45.5…………..1100 102-109.5 45.5-50…………..1200 110-118.5 50-54…………..1300 119-128.5 54-58…………..1400 129-.136.5 58-62…………..1500 137-146.5 62-67…………..1600 147-155.5 67-71…………..1700 156-164.5 71-75…………..1800 165-173.5 75-79…………..1900 174-182.5 79-83…………..2000 183-191.5 83-87…………..2100 192-199.5 87-91…………..2200 200-209.5 91-95…………..2300 210-218.5 95-99…………..2400 219 and Over Over 99…………2500
⛔ Contraindications ▾
CONTRAINDICATIONS ETHAMBUTOL HCl is contraindicated in patients who are known to be hypersensitive to this drug. It is also contraindicated in patients with known optic neuritis unless clinical judgment determines that it may be used. ETHAMBUTOL HCl is contraindicated in patients who are unable to appreciate and report visual side effects or changes in vision (e.g., young children, unconscious patients).
⚠️ Warnings and Cautions ▾
WARNINGS ETHAMBUTOL HCl may produce decreases in visual acuity which appear to be due to optic neuritis. This effect may be related to dose and duration of treatment. This effect is generally reversible when administration of the drug is discontinued promptly.
However, irreversible blindness has been reported. (See PRECAUTIONS and ADVERSE REACTIONS ). Liver toxicities including fatalities have been reported (see ADVERSE REACTIONS ).
Baseline and periodic assessment of hepatic function should be performed.
🤒 Adverse Reactions ▾
ADVERSE REACTIONS ETHAMBUTOL HCl may produce decreases in visual acuity, including irreversible blindness, which appear to be due to optic neuritis. Optic neuropathy including optic neuritis or retrobulbar neuritis occurring in association with ethambutol therapy may be characterized by one or more of the following events: decreased visual acuity, scotoma, color blindness, and/or visual defect. These events have also been reported in the absence of a diagnosis of optic or retrobulbar neuritis.
Patients should be advised to report promptly to their physician any change of visual acuity. The change in visual acuity may be unilateral or bilateral and hence each eye must be tested separately and both eyes tested together . Testing of visual acuity should be performed before beginning ETHAMBUTOL HCl therapy and periodically during drug administration, except that it should be done monthly when a patient is on a dosage of more than 15 mg per kilogram per day.
Snellen eye charts are recommended for testing of visual acuity. Studies have shown that there are definite fluctuations of one or two lines of the Snellen chart in the visual acuity of many tuberculous patients not receiving ETHAMBUTOL HCl. The following table may be useful in interpreting possible changes in visual acuity attributable to ETHAMBUTOL HCl.
Initial Snellen Reading Reading Indicating Significant Decrease Significant Number of Lines Decrease Number of Points 20/13 20/25 3 12 20/15 20/25 2 10 20/20 20/30 2 10 20/25 20/40 2 15 20/30 20/50 2 20 20/40 20/70 2 30 20/50 20/70 1 20 In general, changes in visual acuity less than those indicated under “Significant Number of Lines” and “Decrease Number of Points” may be due to chance variation, limitations of the testing method, or physiologic variability. Conversely, changes in visual acuity equaling or exceeding those under “Significant Number of Lines” and “Decrease Number of Points” indicate need for retesting and careful evaluation of the patient's visual status.
If careful evaluation confirms the magnitude of visual change and fails to reveal another cause, ETHAMBUTOL HCl should be discontinued and the patient reevaluated at frequent intervals. Progressive decreases in visual acuity during therapy must be considered to be due to ETHAMBUTOL HCl. If corrective glasses are used prior to treatment, these must be worn during visual acuity testing.
During 1 to 2 years of therapy, a refractive error may develop which must be corrected in order to obtain accurate test results. Testing the visual acuity through a pinhole eliminates refractive error. Patients developing visual abnormality during ETHAMBUTOL HCl treatment may show subjective visual symptoms before, or simultaneously with, the demonstration of decreases in visual acuity, and all patients receiving ETHAMBUTOL HCl should be questioned periodically about blurred vision and other subjective eye symptoms.
Recovery of visual acuity generally occurs over a period of weeks to months after the drug has been discontinued. Some patients have received ETHAMBUTOL HCl (ethambutol hydrochloride) again after such recovery without recurrence of loss of visual acuity. Other adverse reactions reported include: hypersensitivity, anaphylactic/anaphylactoid reaction, dermatitis, erythema multiforme, pruritus, and joint pain; anorexia, nausea, vomiting, gastrointestinal upset, and abdominal pain; fever, malaise, headache, and dizziness; mental confusion, disorientation, and possible hallucinations; thrombocytopenia, leukopenia, and neutropenia.
Numbness and tingling of the extremities due to peripheral neuritis have been reported. Elevated serum uric acid levels occur and precipitation of acute gout has been reported. Pulmonary infiltrates, with or without eosinophilia, also have been reported during ETHAMBUTOL HCl therapy.
Liver toxicities, including fatalities, have been reported. (See WARNINGS ). Since ETHAMBUTOL HCl is recommended for therapy in conjunction with one or more other ant…
🔄 Drug Interactions ▾
Drug Interactions The results of a study of coadministration of ETHAMBUTOL HCl (50mg/kg) with an aluminum hydroxide containing antacid to 13 patients with tuberculosis showed a reduction of mean serum concentrations and urinary excretion of ethambutol of approximately 20% and 13%, respectively, suggesting that the oral absorption of ethambutol may be reduced by these antacid products. It is recommended to avoid concurrent administration of ethambutol with aluminum hydroxide containing antacids for at least 4 hours following ethambutol administration.
🤰 Pregnancy ▾
Pregnancy Teratogenic Effects: Pregnancy Category C. There are no adequate and well-controlled studies in pregnant women. There are reports of ophthalmic abnormalities occurring in infants born to women on antituberculous therapy that included ETHAMBUTOL HCl.
ETHAMBUTOL HCl should be used during pregnancy only if the benefit justifies the potential risk to the fetus. ETHAMBUTOL HCl has been shown to be teratogenic in pregnant mice and rabbits when given in high doses. When pregnant mice or rabbits were treated with high doses of ethambutol hydrochloride, fetal mortality was slightly but not significantly (P>0.05) increased.
Female rats treated with ethambutol hydrochloride displayed slight but insignificant (P>0.05) decreases in fertility and litter size. In fetuses born of mice treated with high doses of ETHAMBUTOL HCl during pregnancy, a low incidence of cleft palate, exencephaly and abnormality of the vertebral column were observed. Minor abnormalities of the cervical vertebra were seen in the newborn of rats treated with high doses of ethambutol hydrochloride during pregnancy.
Rabbits receiving high doses of ETHAMBUTOL HCl during pregnancy gave birth to two fetuses with monophthalmia, one with a shortened right forearm accompanied by bilateral wrist-joint contracture and one with hare lip and cleft palate.
🧒 Pediatric Use ▾
Pediatric Use ETHAMBUTOL HCl (ethambutol hydrochloride) is not recommended for use in pediatric patients under thirteen years of age since safe conditions for use have not been established.
🧓 Geriatric Use ▾
Geriatric Use There are limited data on the use of ETHAMBUTOL HCl in the elderly. One study of 101 patients, 65 years and older, on multiple drug antituberculosis regimens included 94 patients on ETHAMBUTOL HCl. No differences in safety or tolerability were observed in these patients compared with that reported in adults in general.
Other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
🧬 Clinical Pharmacology ▾
CLINICAL PHARMACOLOGY ETHAMBUTOL HCL, following a single oral dose of 25 mg/kg of body weight, attains a peak of 2 to 5 mcg/mL in serum 2 to 4 hours after administration. When the drug is administered daily for longer periods of time at this dose, serum levels are similar. The serum level of ETHAMBUTOL HCL falls to undetectable levels by 24 hours after the last dose except in some patients with abnormal renal function.
The intracellular concentrations of erythrocytes reach peak values approximately twice those of plasma and maintain this ratio throughout the 24 hours. During the 24-hour period following oral administration of ETHAMBUTOL HCl approximately 50 percent of the initial dose is excreted unchanged in the urine, while an additional 8 to 15 percent appears in the form of metabolites. The main path of metabolism appears to be an initial oxidation of the alcohol to an aldehydic intermediate, followed by conversion to a dicarboxylic acid.
From 20 to 22 percent of the initial dose is excreted in the feces as unchanged drug. No drug accumulation has been observed with consecutive single daily doses of 25 mg/kg in patients with normal kidney function, although marked accumulation has been demonstrated in patients with renal insufficiency. ETHAMBUTOL HCl diffuses into actively growing Mycobacterium cells such as tubercle bacilli.
ETHAMBUTOL HCl appears to inhibit the synthesis of one or more metabolites, thus causing impairment of cell metabolism, arrest of multiplication, and cell death. No cross resistance with other available antimycobacterial agents has been demonstrated. ETHAMBUTOL HCl has been shown to be effective against strains of Mycobacterium tuberculosis but does not seem to be active against fungi, viruses, or other bacteria.
Mycobacterium tuberculosis strains previously unexposed to ETHAMBUTOL HCL have been uniformly sensitive to concentrations of 8 or less mcg/mL, depending on the nature of the culture media. When ETHAMBUTOL HCl has been used alone for treatment of tuberculosis, tubercle bacilli from these patients have developed resistance to ETHAMBUTOL HCl (ethambutol hydrochloride) by in vitro susceptibility tests; the development of resistance has been unpredictable and appears to occur in a step-like manner. No cross resistance between ETHAMBUTOL HCl and other antituberculous drugs has been reported.
ETHAMBUTOL HCl has reduced the incidence of the emergence of mycobacterial resistance to isoniazid when both drugs have been used concurrently. An agar diffusion microbiologic assay, based upon inhibition of Mycobacterium smegmatis (ATCC 607) may be used to determine concentrations of ETHAMBUTOL HCl in serum and urine.
📦 How Supplied / Storage and Handling ▾
HOW SUPPLIED Ethambutol hydrochloride Tablets USP 100 mg – round, convex, white, film coated tablets engraved E6 on one side are supplied as follows: NDC 10135-796-01 - Bottle of 100 400 mg – round, convex, white, scored, film coated tablets engraved with E to the left and 7 to the right of the score on one side are supplied as follows: NDC 10135-797-01 - Bottle of 100 Store at controlled room temperature 20° to 25° C (68° to 77° F). To report SUSPECTED ADVERSE REACTIONS, contact Marlex Pharmaceuticals, Inc. at 1-800-582-1953 or [email protected] or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch Manufactured by : Cadila Pharmaceuticals Limited 1389 Trasad Road, Dholka, Ahmedabad, Gujarat, India.
Manufactured for: Kanchan Healthcare Inc. Suite No. 202; 1 Gatehall Drive Parsippany, NJ 07054 USA Distributed by: Marlex Pharmaceuticals, Inc.
65 Lukens Drive, New castle, DE 19720, USA. Revised 02/2025
📋 Description ▾
DESCRIPTION ETHAMBUTOL HYDROCHLORIDE is an oral chemotherapeutic agent which is specifically effective against actively growing microorganisms of the genus Mycobacterium, including M. tuberculosis. The structural formula is: ETHAMBUTOL HYDROCHLORIDE (HCL) 100 and 400 mg tablets contain the following inactive ingredients: Gelatin, Hydroxypropyl Methylcellulose, Magnesium Stearate, Sodium Lauryl Sulfate, Sorbitol, Stearic Acid, Sucrose, Titanium Dioxide and other ingredients. structural formula