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INTERFERON, BETA-1A (Systemic)
Some commonly used brand names are:
In the U.S.—
Interferon beta-1a (in-ter-FEER-on BAY-ta) is used to treat the relapsing forms of multiple sclerosis (MS). This medicine will not cure MS, but it may slow some disabling effects and decrease the number of relapses of the disease.
Interferon beta-1a is also used to treat genital warts.
This medicine is available only with your doctor"s prescription, in the following dosage form(s):
Before Using This Medicine
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For interferon beta-1a, the following should be considered:
Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to interferons or human albumin. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.
Pregnancy—Interferon beta-1a has not been studied in pregnant women. However, studies in animals have shown that interferon beta-1a may cause miscarriages. Be sure your doctor knows if you are pregnant or if you may become pregnant.
Breast-feeding—It is not known whether interferon beta-1a passes into breast milk. Because of the possibility of serious unwanted effects in the nursing infant, it is important that you discuss the use of this medicine with your doctor if you wish to breast-feed.
Children—Studies on this medicine have been done only in adult patients, and there is no specific information comparing use of interferon beta-1a in children with use in other age groups.
Older adults—Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults. Although there is no specific information comparing use of interferon beta-1a in the elderly with use in other age groups, this medicine is not expected to cause different side effects or problems in older people than it does in younger adults.
Other medicines—Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your health care professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.
Other medical problems—The presence of other medical problems may affect the use of interferon beta-1a. Make sure you tell your doctor if you have any other medical problems, especially:
Proper Use of This Medicine
If you are injecting this medicine yourself, use it exactly as directed by your doctor .
Special patient directions come with interferon beta-1a injection. Read the directions carefully before using the medicine. Make sure you understand:
Dosing—If you are receiving interferon beta-1a at home, follow your doctors orders or the directions on the label . If you have any questions about the proper dose of interferon beta-1a, ask your doctor.
Missed dose—If you miss a dose of this medicine, take it as soon as remembered. The next injection should be scheduled at least 48 hours later.
Storage—To store this medicine:
Precautions While Using This Medicine
It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly and to check for unwanted effects.
Importance of caretaker and/or patient informing doctor of any signs or symptoms of depression or other mental or mood disturbances.
Check with your doctor right away if you experience dark urine, persistent loss of appetite, yellow eyes or skin, influenza (flu)-like symptoms, right upper quadrant tenderness, headache, stomach pain, continuing vomiting, general feeling of tiredness or weakness, or light-colored stools. These could be symptoms of serious liver problems.
You should avoid alcohol while you are taking this medicine. It can cause serious liver problems.
This medicine commonly causes a flu-like reaction, with aching muscles, chills, fever, headache, joint pain, and nausea. Your doctor may ask you to take acetaminophen to help control these effects. Follow your doctor"s instructions carefully about how much and when to take acetaminophen.
Side Effects of This Medicine
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Black, tarry stools; chest pain; chills; cough; diarrhea; fever; flu-like symptoms including headache, joint pain, muscle aches, and nausea; pain; painful or difficult urination; shortness of breath; sores, ulcers, or white spots on lips or in mouth; swollen glands; unusual bleeding or bruising; unusual tiredness or weakness
Abdominal pain; chest pain; clumsiness or unsteadiness; convulsions (seizures); coughing; decreased hearing; difficulty in swallowing; dizziness; fainting; flushing; hives or itching; mood changes, especially with thoughts of suicide; muscle spasms; pain or discharge from the vagina; pelvic discomfort, aching, or heaviness; redness, swelling, or tenderness at place of injection; runny or stuffy nose; skin lesions; sneezing; sore throat; speech problems; swelling of face, lips, or eyelids; troubled breathing; wheezing
Earache; general feeling of discomfort or illness; loss of appetite; painful blisters on trunk of body—also known as shingles; painful cold sores or blisters on lips, nose, eyes, or genitals
Incidence not known
Bleeding gums; blood in urine or stools; bloody nose; chest discomfort; confusion; constipation; continuing vomiting; convulsions; dark urine; decreased urine output; depressed mood; dilated neck veins; dry skin and hair; extreme fatigue; faintness; fast, irregular, or pounding heartbeat; feeling cold; general tiredness and weakness; hair loss; heavier menstrual periods; high fever; hoarseness or husky voice; irregular breathing; light-colored stools; loss of bladder control; mental depression; mood or other mental changes; muscle cramps and stiffness; muscle spasm or jerking of all extremities; nausea and vomiting; nervousness; pale skin; persistent anorexia; pinpoint red spots on skin; pruritus; puffiness or swelling of the eyelids, or around the eyes, face, lips, or tongue; redness, blistering, peeling, or loosening of the skin; right upper quadrant tenderness; sensitivity to heat; shortness of breath; skin rash; slowed heartbeat; stomach pain; sudden loss of consciousness; sweating; swelling of face, fingers, feet, or lower legs; swelling of the mouth or throat; tightness in chest; tightness in throat; upper right abdominal pain; vesicular rash; weight gain; weight loss; yellow eyes and skin
Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:
Heartburn; indigestion; sour stomach
Hair loss; trouble in sleeping
Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.
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