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What is this medication?

Antitubercular Agent

Brand Name US: Myambutol
Canadian Equivalent: Etibi

Ethambutol is indicated for the treatment of tuberculosis.

How does this medication work? 

MYAMBUTOL/ETIBI (Ethambutol) inhibits arabinosyl transferase resulting in impaired mycobacterial cell wall synthesis.

How should I take this medication? 

Oral: Doses should be based on lean body weight for patients within a normal weight range for their height (optimal dosing for obese patients has not been established):
40 to 55 kg: Take 800 mg (14.5 to 20 mg/kg).
56 to 75 kg: Take 1,200 mg (16 to 21.4 mg/kg).
76 to 90 kg: Take 1,600 mg (17.8 to 21.1 mg/kg).

Note: Always administer in combination with other antitubercular drugs.

How to Take: Can be taken with or without food; if GI upset occur then take with food.

What should I watch for while using this medication? 

Before starting MYAMBUTOL/ETIBI (Ethambutol), make sure your physician is aware of any allergies or medications you currently take.  Ethambutol can cause hepatoxicity and optic neuritis which is characterized by unilateral or bilateral changes in visual acuity.  Ethambutol should be used with caution in patients with ocular disease and renal impairment.

What if I miss a dose?

If you miss a dose of medication, try to take it as soon as possible. However, if it is almost time for your next dose, take only that scheduled dose. Do not take double or extra doses.

How should I store this medication?

Keep out of the reach of children at all times. Store at room temperature, 59 to 86° F (15 to 30° C). Protect from light. Keep the container tightly closed. Properly dispose of any unused medication after the expiration date.

What are the possible side effects of using this medication?

Myocarditis, pericarditis, confusion, disorientation, dizziness, hallucination, headache, malaise, peripheral neuritis, dermatitis, erythema multiforme, exfoliative dermatitis, pruritus, skin rash, gout, abdominal pain, anorexia, gastric distress, nausea, vomiting, hematologic disturbances (i.e. eosinophilia, leukopenia, lymphadenopathy, neutropenia, thrombocytopenia), hepatitis, hepatotoxicity, joint pain, color blindness, decreased visual acuity, optic neuritis, scotoma, visual disturbance, nephritis, pneumonitis and fever.

Note this is not a complete list of side effects for MYAMBUTOL/ETIBI (Ethambutol), only common ones.