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Avonex Side Effects

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Common Avonex Side Effects


The most commonly reported Avonex side effects (click to view or check a box to report):

Fall (5319)
Influenza Like Illness (5127)
Multiple Sclerosis Relapse (4833)
Multiple Sclerosis (3069)
Fatigue (2841)
Gait Disturbance (2489)
Pneumonia (2313)
Headache (2287)
Pain (2246)
Asthenia (2154)
Myocardial Infarction (1791)
Pyrexia (1745)
Depression (1708)
Hypoaesthesia (1671)
Pain In Extremity (1619)
Urinary Tract Infection (1618)
Memory Impairment (1597)
Injection Site Pain (1541)
Condition Aggravated (1506)
Balance Disorder (1474)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Avonex Side Effects Reported to FDA



Avonex Side Effect Report#9998472
Hypotonia, Malaise
This is a report of a 57-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
Jul 04, 1996), combined with: NA. and developed a serious reaction and side effect(s): Hypotonia, Malaise after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Hypotonia side effect.
Avonex Side Effect Report#9998459
Gingival Blister, Abdominal Pain Upper, Chills, Rhinorrhoea, Hyperhidrosis, Nausea, Vomiting
This report suggests a potential Avonex Gingival Blister side effect(s) that can have serious consequences. A 57-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: multiple sclerosis and used Avonex (dosage: NA) starting
Jan 02, 2014. After starting Avonex the patient began experiencing various side effects, including: Gingival Blister, Abdominal Pain Upper, Chills, Rhinorrhoea, Hyperhidrosis, Nausea, VomitingAdditional drugs used concurrently: NA. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Gingival Blister, may still occur.
Avonex Side Effect Report#9998456
Injection Site Haemorrhage, Injection Site Pain
This Injection Site Haemorrhage problem was reported by a consumer or non-health professional from US. A 44-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On
Nov 20, 2013 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: Injection Site Haemorrhage, Injection Site PainAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Injection Site Haemorrhage, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9998454
Vitamin D Decreased
This Vitamin D Decreased side effect was reported by a consumer or non-health professional from US. A 34-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on
May 05, 2012. Concurrently used drugs: NA..After starting to take Avonex the consumer reported adverse symptoms, such as: Vitamin D DecreasedThese side effects may potentially be related to Avonex.
Avonex Side Effect Report#9998451
Injection Site Mass
This is a report of a 40-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
May 24, 2008), combined with: NA. and developed a serious reaction and side effect(s): Injection Site Mass after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Injection Site Mass side effect.
Avonex Side Effect Report#9998439
Memory Impairment
This report suggests a potential Avonex Memory Impairment side effect(s) that can have serious consequences. A 46-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: multiple sclerosis and used Avonex (dosage: NA) starting
Oct 03, 2005. After starting Avonex the patient began experiencing various side effects, including: Memory ImpairmentAdditional drugs used concurrently: NA. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Memory Impairment, may still occur.
Avonex Side Effect Report#9998437
Visual Impairment, Diplopia, Central Nervous System Lesion, Cognitive Disorder, Memory Impairment, Fatigue
This Visual Impairment problem was reported by a consumer or non-health professional from US. A 46-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On
Oct 20, 2013 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: Visual Impairment, Diplopia, Central Nervous System Lesion, Cognitive Disorder, Memory Impairment, FatigueAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Visual Impairment, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9998418
Liver Disorder, Multiple Sclerosis Relapse
This Liver Disorder side effect was reported by a consumer or non-health professional from US. A 58-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on
Sep 03, 2009. Concurrently used drugs:
  • Gilenya
.After starting to take Avonex the consumer reported adverse symptoms, such as: Liver Disorder, Multiple Sclerosis RelapseThese side effects may potentially be related to Avonex.
Avonex Side Effect Report#9998410
Constipation, Headache, Nausea
This is a report of a 51-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time: 201006), combined with: NA. and developed a serious reaction and side effect(s): Constipation, Headache, Nausea after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Constipation side effect.
Avonex Side Effect Report#9998391
Memory Impairment, Influenza Like Illness
This report suggests a potential Avonex Memory Impairment side effect(s) that can have serious consequences. A 53-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: multiple sclerosis and used Avonex (dosage: NA) starting
Apr 22, 2013. After starting Avonex the patient began experiencing various side effects, including: Memory Impairment, Influenza Like IllnessAdditional drugs used concurrently: NA. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Memory Impairment, may still occur.
Avonex Side Effect Report#9998389
Blood Pressure Increased, Frustration, Headache, Pain, Chills
This Blood Pressure Increased problem was reported by a consumer or non-health professional from US. A 35-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On
Jul 08, 2011 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: Blood Pressure Increased, Frustration, Headache, Pain, ChillsAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Blood Pressure Increased, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9998385
Urinary Tract Infection, Skin Mass, Pruritus, Influenza Like Illness, Asthenia
This Urinary Tract Infection side effect was reported by a consumer or non-health professional from US. A 55-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on
Sep 03, 2009. Concurrently used drugs: NA..After starting to take Avonex the consumer reported adverse symptoms, such as: Urinary Tract Infection, Skin Mass, Pruritus, Influenza Like Illness, AstheniaThese side effects may potentially be related to Avonex.
Avonex Side Effect Report#9998366
Cardiac Disorder, Malaise
This is a report of a 40-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
Feb 18, 2014), combined with: NA. and developed a serious reaction and side effect(s): Cardiac Disorder, Malaise after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Cardiac Disorder side effect. The patient was hospitalized.
Avonex Side Effect Report#9998364
Gait Disturbance, Back Pain, Nausea, Dizziness, Weight Increased
This report suggests a potential Avonex Gait Disturbance side effect(s) that can have serious consequences. A 38-year-old female patient (weight: NA) from DE was diagnosed with the following symptoms/conditions: multiple sclerosis and used Avonex (dosage: NA) starting
Aug 01, 2008. After starting Avonex the patient began experiencing various side effects, including: Gait Disturbance, Back Pain, Nausea, Dizziness, Weight IncreasedAdditional drugs used concurrently: NA.The patient was hospitalized. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Gait Disturbance, may still occur.
Avonex Side Effect Report#9998363
Bladder Discomfort, Blood Urine Present
This Bladder Discomfort problem was reported by a consumer or non-health professional from DE. A 63-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On
Apr 01, 2011 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: Bladder Discomfort, Blood Urine PresentThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Bladder Discomfort, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9998362
Optic Neuritis, Multiple Sclerosis Relapse
This Optic Neuritis side effect was reported by a consumer or non-health professional from DE. A 33-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on
Sep 01, 2004. Concurrently used drugs: NA..After starting to take Avonex the consumer reported adverse symptoms, such as: Optic Neuritis, Multiple Sclerosis RelapseThese side effects may potentially be related to Avonex. The patient was hospitalized.
Avonex Side Effect Report#9998361
Breast Cancer
This is a report of a 55-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
Nov 12, 2013), combined with: NA. and developed a serious reaction and side effect(s): Breast Cancer after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Breast Cancer side effect.
Avonex Side Effect Report#9996011
Hypoaesthesia
This report suggests a potential Avonex Hypoaesthesia side effect(s) that can have serious consequences. A 48-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Avonex (dosage: NA) starting
Jan 06, 2014. After starting Avonex the patient began experiencing various side effects, including: HypoaesthesiaAdditional drugs used concurrently: NA. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Hypoaesthesia, may still occur.
Avonex Side Effect Report#9994442
Nasopharyngitis
This Nasopharyngitis problem was reported by a consumer or non-health professional from US. A 52-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On 201401 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: NasopharyngitisAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Nasopharyngitis, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9994440
Injection Site Haemorrhage
This Injection Site Haemorrhage side effect was reported by a consumer or non-health professional from US. A 73-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on
Mar 01, 2013. Concurrently used drugs: NA..After starting to take Avonex the consumer reported adverse symptoms, such as: Injection Site HaemorrhageThese side effects may potentially be related to Avonex.
Avonex Side Effect Report#9994438
Arthritis
This is a report of a 61-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
Oct 05, 2012), combined with: NA. and developed a serious reaction and side effect(s): Arthritis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Arthritis side effect.
Avonex Side Effect Report#9994436
Laceration, Malaise, Asthenia
This report suggests a potential Avonex Laceration side effect(s) that can have serious consequences. A 55-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: multiple sclerosis and used Avonex (dosage: NA) starting
Oct 01, 1996. After starting Avonex the patient began experiencing various side effects, including: Laceration, Malaise, AstheniaAdditional drugs used concurrently: NA. Although Avonex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Laceration, may still occur.
Avonex Side Effect Report#9994432
Convulsion, Memory Impairment, Confusional State
This Convulsion problem was reported by a consumer or non-health professional from US. A 42-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: multiple sclerosis. On
Nov 17, 2011 this consumer started treatment with Avonex (dosage: NA). The following drugs were being taken at the same time: NA. When using Avonex, the patient experienced the following unwanted symptoms/side effects: Convulsion, Memory Impairment, Confusional StateAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Convulsion, may become evident only after a product is in use by the general population.
Avonex Side Effect Report#9994429
Tremor, Gait Disturbance, Visual Impairment, Pharyngeal Oedema, Influenza Like Illness, Dyspnoea, Feeling Abnormal, Urticaria
This Tremor side effect was reported by a consumer or non-health professional from US. A 29-year-old female patient (weight:NA) experienced the following symptoms/conditions: relapsing-remitting multiple sclerosis.The patient was prescribed Avonex (drug dosage: NA), which was initiated on 201401. Concurrently used drugs: NA..After starting to take Avonex the consumer reported adverse symptoms, such as: Tremor, Gait Disturbance, Visual Impairment, Pharyngeal Oedema, Influenza Like Illness, Dyspnoea, Feeling Abnormal, UrticariaThese side effects may potentially be related to Avonex.
Avonex Side Effect Report#9994426
Confusional State
This is a report of a 65-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple sclerosis, who was treated with Avonex (dosage: NA, start time:
Apr 18, 2003), combined with: NA. and developed a serious reaction and side effect(s): Confusional State after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Avonex treatment in female patients, resulting in Confusional State side effect.


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The appearance of Avonex on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Avonex Side Effects for Women?

Women Side EffectsReports
Fall 4399
Influenza Like Illness 4021
Multiple Sclerosis Relapse 3911
Multiple Sclerosis 2390
Fatigue 2362
Gait Disturbance 1885
Headache 1878
Pain 1827
Pneumonia 1789
Asthenia 1680

What are common Avonex Side Effects for Men?

Men Side EffectsReports
Influenza Like Illness 1084
Multiple Sclerosis Relapse 917
Fall 913
Multiple Sclerosis 673
Gait Disturbance 598
Myocardial Infarction 574
Pneumonia 520
Fatigue 472
Asthenia 471
Pain 414

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Avonex reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

    Discuss Avonex Side Effects

    Did You Have a Avonex Side Effect?

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    How Effective is Avonex for You?

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    Avonex Safety Alerts, Active Ingredients, Usage Information

    NDC59627-001
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameAVONEX
    Nameinterferon beta-1a
    Dosage FormINJECTION, POWDER, LYOPHILIZED, FOR SOLUTION
    RouteINTRAMUSCULAR
    On market since19960517
    LabelerBiogen Idec Inc.
    Active Ingredient(s)INTERFERON BETA-1A
    Strength(s)30
    Unit(s)ug/mL
    Pharma ClassInterferon-beta [Chemical/Ingredient],Recombinant Human Interferon beta [EPC],Recombinant Proteins [

    More About Avonex

    Side Effects reported to FDA: 68088

    Avonex safety alerts: 2005 2003

    Reported deaths: 4150

    Reported hospitalizations: 41314

    Avonex (interferon beta-1a)

    Audience: Neurologists and other healthcare professionals

    FDA and Biogen notified healthcare professionals of revisions to the WARNINGS, PRECAUTIONS/Drug Interactions and ADVERSE REACTIONS/Post-Marketing Experience sections and Medication Guide. Severe hepatic injury, including cases of hepatic failure, has been reported in patients taking Avonex. Asymptomatic elevation of hepatic transaminases has also been reported, and in some patients has recurred upon rechallenge. In some cases, these events have occurred in the presence of other drugs that have been associated with hepatic injury. The potential risk of Avonex used in combination with known hepatotoxic drugs or other products (e.g. alcohol) should be considered prior to Avonex administration, or when adding new agents to the regimen of patients already on Avonex.

    [March 2005 - Letter - Biogen]

    Latest Avonex clinical trials