ISONIAZID DESCRIPTION

Isoniazid

Why is Isoniazid prescribed?

Isoniazid is a combination antibiotic used to treat the initial phase of tuberculosis. After a 2-month period, your doctor may prescribe another combination of antituberculosis drugs (Rifamate), which can be continued for longer periods.

Where can I order Isoniazid From? Can I buy Isoniazid at Canadian Prices?

Yes, if you are from the U.S. then you can buy Isoniazid at Canadian prices. Currently we will only accept an order for Isoniazid from U.S. and Canadian residents. Both U.S. and Canadian residents require a prescription to purchase Isoniazid and when you order Isoniazid it will be delivered with express shipping.

Most important fact about Isoniazid

Isoniazid, one of the components of Isoniazid, sometimes causes liver damage. Contact your doctor immediately if you develop yellowing of the eyes or skin, fatigue, weakness, loss of appetite, nausea, or vomiting.

How should you take Isoniazid?

Take Isoniazid exactly as prescribed. Do not stop without consulting your doctor. It is important to take all of the drug prescribed for you, even if you feel better, and not to miss any doses. Take Isoniazid on an empty stomach, either 1 hour before or 2 hours after a meal, with a full glass of water. Wait at least 1 hour before taking an antacid, as antacids may interfere with the drug. If needed, your doctor may suggest taking vitamin B6 while you are on Isoniazid therapy. --If you miss a dose...Take it as soon as you remember. If it is almost time for the next dose, skip the one you missed and go back to your regular schedule. Never take 2 doses at once. --Storage instructions...

Store at room temperature. Protect from moisture.

What side effects may occur with Isoniazid?

Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Isoniazid.

More common side effects may include:
Angina (crushing chest pain), anxiety, bone pain, chest pain, chest tightness, cough, coughing up blood, diabetic coma, diarrhea, difficult breathing, digestive pain, fast, fluttery heartbeat, headache, hepatitis, hives, itching, joint pain, nausea, numbness or tingling of the legs, rash, reddened skin, skin peeling or flaking, sleeplessness, sweating, swelling of the legs, vomiting, yellowing of skin and eyes

Less common side effects may include:
High or persistent fever, ringing in ears, vertigo

Why should Isoniazid not be prescribed?

Do not take this medication if you have ever had an allergic reaction to or are sensitive to rifampin, isoniazid, or pyrazinamide. If you have serious liver disease or have ever had a severe side effect from isoniazid (such as fever, chills, and arthritis), do not take Isoniazid. Also, if you have a history of liver disease or have had acute and painful joint swelling (gout), avoid this drug.

Special warnings about Isoniazid

Isoniazid may cause your urine, sputum, sweat, and tears to turn a red-orange color. This is to be expected and is not harmful. The drug may also permanently discolor contact lenses. Since Isoniazid may cause eye problems, you should have a complete eye examination before starting therapy and periodically during Isoniazid treatment. Limit the amount of alcohol you drink while on this medicine. Daily users of alcohol may be more prone to liver problems. Use this medicine with caution if you have diabetes or kidney disease.

When rifampin, one of the drugs in Isoniazid, is taken at high doses (more than 600 milligrams) once or twice a week, it is likely that side effects may increase, including "flu-like" symptoms such as fever, chills, fatigue, weakness, upset stomach, and shortness of breath.

Recommended Isoniazid dosage

ADULTS Take once a day, as follows:

If you weigh 97 pounds or less: 4 tablets
If you weigh 98 to 120 pounds: 5 tablets
If you weigh 121 pounds or more: 6 tablets

CHILDREN Safety and effectiveness in children under the age of 15 have not been established.

Isoniazid Overdosage

Any medication taken in excess can have serious consequences. An untreated overdose of Isoniazid can be fatal. If you suspect an overdose, seek medical attention immediately.

Symptoms of Isoniazid overdose may include:
Blurred vision, coma, dizziness, hallucinations, increasing tiredness or sluggishness, liver enlargement or tenderness, nausea, seizures, slurring of speech, shallow or difficult breathing, stupor, vomiting, yellow eyes and skin

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