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Relenza Side Effects

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Common Relenza Side Effects


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

Abnormal Behaviour (611)
Overdose (246)
Hallucination (225)
Delirium (168)
Loss Of Consciousness (93)
Pyrexia (91)
Aggression (90)
Depressed Level Of Consciousness (77)
No Adverse Event (74)
Restlessness (72)
Agitation (65)
Amnesia (63)
Altered State Of Consciousness (59)
Hallucination, Auditory (58)
Feeling Abnormal (55)
Speech Disorder (52)
Convulsion (49)
Crying (46)
Fall (46)
Vomiting (45)

➢ 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.

Relenza Side Effects Reported to FDA



Relenza Side Effect Report#9996384
Purpura, Erythema, Hyperthermia, Rash
This is a report of a 79-year-old male patient (weight: NA) from JP, suffering from the following health symptoms/conditions: influenza, who was treated with Relenza (dosage: 10mg Twice Per Day, start time:
Jan 23, 2014), combined with:
  • Amaryl (1mg Per Day)
  • Micamlo (1iuax Per Day)
  • Allopurinol (100mg Twice Per Day)
  • Trichlormethiazide (1mg Per Day)
and developed a serious reaction and side effect(s): Purpura, Erythema, Hyperthermia, Rash after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in male patients, resulting in Purpura side effect. The patient was hospitalized.
Relenza Side Effect Report#9992433
Mental Impairment, Abnormal Behaviour, Moaning, Dyspnoea, Lacrimation Increased, Body Temperature Increased
This report suggests a potential Relenza Mental Impairment side effect(s) that can have serious consequences. A 21-year-old female patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: influenza and used Relenza (dosage: 10mg Twice Per Day) starting
Feb 20, 2014. After starting Relenza the patient began experiencing various side effects, including: Mental Impairment, Abnormal Behaviour, Moaning, Dyspnoea, Lacrimation Increased, Body Temperature IncreasedAdditional drugs used concurrently:
  • Loxonin (60mg Per Day)
  • Chinese Medicine (1iuax Per Day)
  • Clarith (200mg Twice Per Day)
  • Calonal (400mg Twice Per Day)
  • Resplen
Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Mental Impairment, may still occur.
Relenza Side Effect Report#9983815
Anosmia
This Anosmia problem was reported by a pharmacist from JP. A 54-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza. On 2012 this consumer started treatment with Relenza (dosage: 10mg Twice Per Day). The following drugs were being taken at the same time:
  • Acetaminophen
When using Relenza, the patient experienced the following unwanted symptoms/side effects: AnosmiaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Anosmia, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9964386
Hypothermia
This Hypothermia side effect was reported by a physician from JP. A 25-year-old male patient (weight:NA) experienced the following symptoms/conditions: influenza,rhinitis.The patient was prescribed Relenza (drug dosage: 10mg Twice Per Day), which was initiated on
Feb 25, 2014. Concurrently used drugs:
  • Ebastine (10mg Per Day)
  • Flunase (japan) (50mg Twice Per Day)
.After starting to take Relenza the consumer reported adverse symptoms, such as: HypothermiaThese side effects may potentially be related to Relenza.
Relenza Side Effect Report#9964070
Altered State Of Consciousness, Coordination Abnormal, Muscular Weakness, Musculoskeletal Stiffness, Vision Blurred, Sensory Disturbance, Feeling Abnormal
This is a report of a 9.-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: influenza, who was treated with Relenza (dosage: 10mg Twice Per Day, start time:
Feb 25, 2014), combined with:
  • Meptin
  • Mucodyne
  • Telgin G
and developed a serious reaction and side effect(s): Altered State Of Consciousness, Coordination Abnormal, Muscular Weakness, Musculoskeletal Stiffness, Vision Blurred, Sensory Disturbance, Feeling Abnormal after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in female patients, resulting in Altered State Of Consciousness side effect. The patient was hospitalized.
Relenza Side Effect Report#9934805
Altered State Of Consciousness, Face Oedema, Dyspnoea, Depressed Level Of Consciousness, Loss Of Consciousness, Fall
This report suggests a potential Relenza Altered State Of Consciousness side effect(s) that can have serious consequences. A 64-year-old female patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: influenza and used Relenza (dosage: 10mg Twice Per Day) starting
Jan 29, 2014. After starting Relenza the patient began experiencing various side effects, including: Altered State Of Consciousness, Face Oedema, Dyspnoea, Depressed Level Of Consciousness, Loss Of Consciousness, FallAdditional drugs used concurrently:
  • Acetaminophen
  • Huscode (3iuax Three Times Per Day)
Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Altered State Of Consciousness, may still occur.
Relenza Side Effect Report#9909653
Abnormal Behaviour, Laceration, Hallucination, Feeling Abnormal
This Abnormal Behaviour problem was reported by a physician from JP. A 17-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza. On
Jan 27, 2014 this consumer started treatment with Relenza (dosage: 10mg Twice Per Day). The following drugs were being taken at the same time: NA. When using Relenza, the patient experienced the following unwanted symptoms/side effects: Abnormal Behaviour, Laceration, Hallucination, Feeling AbnormalAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Abnormal Behaviour, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9885996
Mental Impairment, Malaise
This Mental Impairment side effect was reported by a consumer or non-health professional from JP. A 11-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Relenza (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Relenza the consumer reported adverse symptoms, such as: Mental Impairment, MalaiseThese side effects may potentially be related to Relenza.
Relenza Side Effect Report#9882388
Loss Of Consciousness, Contusion, Abnormal Behaviour, Memory Impairment
This is a report of a 12-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: NA, who was treated with Relenza (dosage: 10mg Twice Per Day, start time:
Jan 31, 2014), combined with: NA. and developed a serious reaction and side effect(s): Loss Of Consciousness, Contusion, Abnormal Behaviour, Memory Impairment after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in female patients, resulting in Loss Of Consciousness side effect.
Relenza Side Effect Report#9863886
Convulsion
This report suggests a potential Relenza Convulsion side effect(s) that can have serious consequences. A 6-year-old male patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: influenza and used Relenza (dosage: NA) starting
Jan 27, 2014. After starting Relenza the patient began experiencing various side effects, including: ConvulsionAdditional drugs used concurrently:
  • Asverin (3ml Three Times Per Day)
  • Periactin (2.5ml Three Times Per Day)
  • Carbocisteine (3ml Three Times Per Day)
Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Convulsion, may still occur.
Relenza Side Effect Report#9863883
Pneumonia Viral, Pathogen Resistance, Nausea, Chest X-ray Abnormal, Hyperthermia
This Pneumonia Viral problem was reported by a physician from JP. A 39-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza. On
Jan 26, 2014 this consumer started treatment with Relenza (dosage: 10mg Twice Per Day). The following drugs were being taken at the same time:
  • Theodur
  • Geninax
  • Metoclopramide
When using Relenza, the patient experienced the following unwanted symptoms/side effects: Pneumonia Viral, Pathogen Resistance, Nausea, Chest X-ray Abnormal, HyperthermiaThe 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 Pneumonia Viral, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9863882
Delirium, Hypoaesthesia, Bruxism, Abnormal Behaviour, Sleep Talking
This Delirium side effect was reported by a consumer or non-health professional from JP. A 10-year-old male patient (weight:NA) experienced the following symptoms/conditions: influenza.The patient was prescribed Relenza (drug dosage: NA), which was initiated on
Jan 27, 2014. Concurrently used drugs: NA..After starting to take Relenza the consumer reported adverse symptoms, such as: Delirium, Hypoaesthesia, Bruxism, Abnormal Behaviour, Sleep TalkingThese side effects may potentially be related to Relenza.
Relenza Side Effect Report#9859695
Genital Haemorrhage, Epistaxis
This is a report of a 11-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: influenza, who was treated with Relenza (dosage: NA, start time:
Jan 25, 2014), combined with: NA. and developed a serious reaction and side effect(s): Genital Haemorrhage, Epistaxis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in female patients, resulting in Genital Haemorrhage side effect.
Relenza Side Effect Report#9846646
Mental Impairment, Irritability, Grimacing, Restlessness, Feeling Abnormal, Headache, Malaise, Abnormal Behaviour
This report suggests a potential Relenza Mental Impairment side effect(s) that can have serious consequences. A 17-year-old male patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: influenza and used Relenza (dosage: 10mg Twice Per Day) starting
Jan 18, 2014. After starting Relenza the patient began experiencing various side effects, including: Mental Impairment, Irritability, Grimacing, Restlessness, Feeling Abnormal, Headache, Malaise, Abnormal BehaviourAdditional drugs used concurrently:
  • Calonal
  • Medicon (15mg Three Times Per Day)
  • Mucodyne (500mg Three Times Per Day)
Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Mental Impairment, may still occur.
Relenza Side Effect Report#9565163
Diarrhoea
This Diarrhoea problem was reported by a consumer or non-health professional from US. A 85-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza. On
Nov 28, 2012 this consumer started treatment with Relenza (dosage: 1app Twice Per Day). The following drugs were being taken at the same time:
  • Zocor
When using Relenza, the patient experienced the following unwanted symptoms/side effects: DiarrhoeaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Diarrhoea, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9555921
Anaphylactic Reaction, Pulse Absent
This Anaphylactic Reaction side effect was reported by a health professional from JP. A 30-year-old female patient (weight:NA) experienced the following symptoms/conditions: antiviral prophylaxis.The patient was prescribed Relenza (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Relenza the consumer reported adverse symptoms, such as: Anaphylactic Reaction, Pulse AbsentThese side effects may potentially be related to Relenza.
Relenza Side Effect Report#9405958
Convulsion, Loss Of Consciousness, Musculoskeletal Stiffness
This is a report of a 8-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: NA, who was treated with Relenza (dosage: NA, start time:
Mar 15, 2009), combined with: NA. and developed a serious reaction and side effect(s): Convulsion, Loss Of Consciousness, Musculoskeletal Stiffness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in female patients, resulting in Convulsion side effect.
Relenza Side Effect Report#9356202
Loss Of Consciousness, Convulsion, Febrile Convulsion
This report suggests a potential Relenza Loss Of Consciousness side effect(s) that can have serious consequences. A 9.-year-old male patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: influenza and used Relenza (dosage: 2iuax Twice Per Day) starting
Feb 28, 2013. After starting Relenza the patient began experiencing various side effects, including: Loss Of Consciousness, Convulsion, Febrile ConvulsionAdditional drugs used concurrently:
  • Nipolazin (.28g Twice Per Day)
  • Mucodyne (.84g Twice Per Day)
The patient was hospitalized. Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Loss Of Consciousness, may still occur.
Relenza Side Effect Report#9296211
Loss Of Consciousness, Urinary Incontinence, Memory Impairment, Fall
This Loss Of Consciousness problem was reported by a physician from JP. A 16-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza. On
Feb 09, 2013 this consumer started treatment with Relenza (dosage: 10mg Twice Per Day). The following drugs were being taken at the same time: NA. When using Relenza, the patient experienced the following unwanted symptoms/side effects: Loss Of Consciousness, Urinary Incontinence, Memory Impairment, FallAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Loss Of Consciousness, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9210782
Convulsion, Loss Of Consciousness
This Convulsion side effect was reported by a physician from JP. A 16-year-old female patient (weight:NA) experienced the following symptoms/conditions: pyrexia.The patient was prescribed Relenza (drug dosage: 2iuax Per Day), which was initiated on
Mar 28, 2013. Concurrently used drugs: NA..After starting to take Relenza the consumer reported adverse symptoms, such as: Convulsion, Loss Of ConsciousnessThese side effects may potentially be related to Relenza. The patient was hospitalized.
Relenza Side Effect Report#9207866
Loss Of Consciousness, Vomiting
This is a report of a 69-year-old male patient (weight: NA) from JP, suffering from the following health symptoms/conditions: influenza, who was treated with Relenza (dosage: 2iuax Twice Per Day, start time:
Mar 15, 2013), combined with:
  • Amlodipine
  • Gasmotin
  • Omerap
  • Atorvastatin
and developed a serious reaction and side effect(s): Loss Of Consciousness, Vomiting after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in male patients, resulting in Loss Of Consciousness side effect.
Relenza Side Effect Report#9193655
Muscular Weakness, Diarrhoea, Myelitis, Guillain-barre Syndrome, Miller Fisher Syndrome, Neuropathy Peripheral
This report suggests a potential Relenza Muscular Weakness side effect(s) that can have serious consequences. A 35-year-old male patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: NA and used Relenza (dosage: NA) starting NS. After starting Relenza the patient began experiencing various side effects, including: Muscular Weakness, Diarrhoea, Myelitis, Guillain-barre Syndrome, Miller Fisher Syndrome, Neuropathy PeripheralAdditional drugs used concurrently: NA. Although Relenza demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Muscular Weakness, may still occur.
Relenza Side Effect Report#9161238
Dyspnoea, Asthma
This Dyspnoea problem was reported by a physician from JP. A 56-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: influenza,asthma. On
Feb 02, 2013 this consumer started treatment with Relenza (dosage: NA). The following drugs were being taken at the same time:
  • Meptin (4iuax Per Day)
When using Relenza, the patient experienced the following unwanted symptoms/side effects: Dyspnoea, AsthmaThe 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 Dyspnoea, may become evident only after a product is in use by the general population.
Relenza Side Effect Report#9147390
Vith Nerve Paralysis, Visual Impairment, Diplopia
This Vith Nerve Paralysis side effect was reported by a physician from JP. A 63-year-old female patient (weight:NA) experienced the following symptoms/conditions: influenza.The patient was prescribed Relenza (drug dosage: 10mg Twice Per Day), which was initiated on
Feb 13, 2013. Concurrently used drugs: NA..After starting to take Relenza the consumer reported adverse symptoms, such as: Vith Nerve Paralysis, Visual Impairment, DiplopiaThese side effects may potentially be related to Relenza.
Relenza Side Effect Report#9126996
Loss Of Consciousness
This is a report of a 4.-year-old male patient (weight: NA) from JP, suffering from the following health symptoms/conditions: influenza, who was treated with Relenza (dosage: 10mg Twice Per Day, start time:
Jan 04, 2013), combined with:
  • Alpiny
  • Polaramine
  • Mucodyne
and developed a serious reaction and side effect(s): Loss Of Consciousness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Relenza treatment in male patients, resulting in Loss Of Consciousness side effect.


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The appearance of Relenza 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 Relenza Side Effects for Women?

Women Side EffectsReports
Abnormal Behaviour 172
Hallucination 79
Overdose 70
Delirium 55
Loss Of Consciousness 46
Pyrexia 44
Delivery 38
Feeling Abnormal 33
Altered State Of Consciousness 25
Fall 25

What are common Relenza Side Effects for Men?

Men Side EffectsReports
Abnormal Behaviour 431
Hallucination 133
Delirium 108
Overdose 103
Aggression 71
Amnesia 51
Depressed Level Of Consciousness 51
Restlessness 51
Agitation 49
Loss Of Consciousness 47

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.

    Relenza 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 Relenza Side Effects

    Did You Have a Relenza Side Effect?

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    How Effective is Relenza for You?

    Exceeded Expectations
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    Relenza Safety Alerts, Active Ingredients, Usage Information

    NDC0173-0681
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameRELENZA
    Namezanamivir
    Dosage FormPOWDER
    RouteRESPIRATORY (INHALATION)
    On market since19990922
    LabelerGlaxoSmithKline LLC
    Active Ingredient(s)ZANAMIVIR
    Strength(s)5
    Unit(s)mg/1
    Pharma ClassNeuraminidase Inhibitor [EPC],Neuraminidase Inhibitors [MoA]

    Relenza Dosage, Warnings, Usage.

    Side Effects reported to FDA: 1715

    Relenza safety alerts: 2009 2008 2000

    Reported deaths: 24

    Reported hospitalizations: 245

    Relenza (zanamivir) Inhalation Powder

    Audience: Infectious disease healthcare professionals, hospital risk managers

    [Posted 10/09/2009] GlaxoSmithKline (GSK) and FDA notified healthcare professionals of a report of the death of a patient with influenza who received Relenza (zanamivir) Inhalation Powder which was solubilized and administered by mechanical ventilation. Relenza (zanamivir) Inhalation Powder is not intended to be reconstituted in any liquid formulation and is not recommended for use in any nebulizer or mechanical ventilator.

    GSK is aware that Relenza Inhalation Powder is being removed from its FDA-approved packaging and dissolved in various solutions for the purpose of nebulizing zanamivir for inhalation by patients with influenza who are unable to take oral medications or unable to inhale Relenza Inhalation Powder using the Diskhaler. Relenza or zanamivir for nebulization have not been approved by the FDA. The safety, effectiveness, and stability of zanamivir use by nebulization have not been established.

    Relenza Inhalation Powder should only be used as directed in the prescribing information by using the Diskhaler device provided with the drug product. Relenza Inhalation Powder is a mixture of zanamivir active drug substance and lactose drug carrier. This formulation is not designed or intended to be administered by nebulization. There is a risk that the lactose sugar in this formulation can obstruct proper functioning of mechanical ventilator equipment.

    [11/03/2009 - Relenza: Consumer Questions and Answers - FDA]
    [10/09/2009 - Dear Healthcare Professional Letter - GlaxoSmithKline]

    Latest Relenza clinical trials