Prescription Prices and Coupons from GoodRx
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Avonex Coupon - Avonex 4 pens of 30mcg/0.5ml dose pack
Specialty Drug
INTERFERON BETA-1a helps to decrease the number of multiple sclerosis attacks and to slow physical disability in people with relapsing forms of the disease. The medicine does not cure multiple sclerosis. The lowest GoodRx price for the most common version of Avonex is around $6,750.97, 5% off the average retail price of $7,140.98. Compare interferon betas.
Prescription Settings
dose pack
4 pens of 30mcg/0.5ml
1 dose pack
Avonex Coupon - Avonex 4 pens of 30mcg/0.5ml dose pack
dose pack
4 pens of 30mcg/0.5ml
1 dose pack
Insurance Coverage: Many major insurance plans no longer cover Avonex. Learn More

Avonex Side Effects

What should I watch for?

Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.

Visit your doctor or health care professional for regular checks on your progress. You will need frequent blood checks.

Flu-like symptoms are common with the medicine. Using this medicine at night may help. Ask your doctor or health care professional about taking acetaminophen or ibuprofen before your dose and for 24 hours after you receive your injection.

Do not become pregnant while taking this medicine. Women should inform their doctor if they wish to become pregnant or think they might be pregnant. There is a potential for serious side effects to an unborn child. Talk to your health care professional or pharmacist for more information.


Common and Rare Side Effects

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 immediately if any of the following side effects occur:

More common

Black, tarry stools

chest pain





flu-like symptoms


joint pain

muscle aches



painful or difficult urination

shortness of breath

sores, ulcers, or white spots on the lips or in the mouth

swollen glands

unusual bleeding or bruising

unusual tiredness or weakness

Less common

Abdominal or stomach pain

clumsiness or unsteadiness

convulsions (seizures)

decreased hearing

difficulty with swallowing



feeling of warmth

hives or itching

mood changes, especially with thoughts of suicide

muscle spasms

pain or discharge from the vagina

pelvic discomfort, aching, or heaviness

redness of the face, neck, arms, and occasionally, upper chest

redness, swelling, or tenderness at the injection site

runny or stuffy nose

skin lesions


sore throat

speech problems

swelling of the face, lips, or eyelids

troubled breathing



general feeling of discomfort or illness

loss of appetite

painful blisters on trunk of the body

painful cold sores or blisters on the lips, nose, eyes, or genitals

Incidence not known

Bleeding gums

blood in the urine or stools

bloody nose

chest discomfort



dark urine

decreased urine output

depressed mood

dilated neck veins

dry skin and hair

extreme fatigue

fast, irregular, or pounding heartbeat

feeling cold

general tiredness and weakness

hair loss

heavier menstrual periods

high fever

irregular breathing

light-colored stools

loss of bladder control

mental depression

mood or other mental changes

muscle cramps and stiffness

nausea or vomiting


pale skin

persistent loss of appetite

pinpoint red spots on the skin

puffiness or swelling of the eyelids, or around the eyes, face, lips, or tongue

redness, blistering, peeling, or loosening of the skin

sensitivity to heat

skin rash

slowed heartbeat

sudden loss of consciousness


swelling of the face, fingers, feet, or lower legs

swelling of the mouth or throat

tightness in the chest

tightness in the throat

upper right abdominal or stomach pain or tenderness

weight gain or loss

yellow eyes and skin

Some 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. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common



sour stomach

Less common

Hair loss

trouble sleeping

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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