Common Allegra Side Effects


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

Pain (61)
Malaise (60)
Dizziness (59)
Nausea (57)
Dyspnoea (52)
Hepatic Function Abnormal (51)
Alanine Aminotransferase Increased (46)
Insomnia (43)
Abdominal Pain (42)
Loss Of Consciousness (41)
Feeling Abnormal (41)
Aspartate Aminotransferase Increased (40)
Headache (40)
Liver Disorder (40)
Anxiety (38)
Jaundice (36)
Vomiting (35)
Fatigue (33)
Pruritus (33)
Diarrhoea (32)

➢ 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.

Allegra Side Effects Reported to FDA



Allegra Side Effect Report#9970657
Heart Rate Increased, Headache, Facial Pain, Eye Pain, Anxiety
This is a report of a 36-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple allergies, who was treated with Allegra (dosage: NA, start time:
Dec 15, 2013), combined with: NA. and developed a serious reaction and side effect(s): Heart Rate Increased, Headache, Facial Pain, Eye Pain, Anxiety after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in female patients, resulting in Heart Rate Increased side effect.
Allegra Side Effect Report#9938661
Neoplasm Malignant, Renal Disorder
This report suggests a potential Allegra Neoplasm Malignant side effect(s) that can have serious consequences. A 76-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: sinus headache and used Allegra (dosage: NA) starting NS. After starting Allegra the patient began experiencing various side effects, including: Neoplasm Malignant, Renal DisorderAdditional drugs used concurrently:
  • Allegra D
Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Neoplasm Malignant, may still occur.
Allegra Side Effect Report#9919318
Gastric Ulcer
This Gastric Ulcer problem was reported by a consumer or non-health professional from US. A 53-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: upper-airway cough syndrome. On NS this consumer started treatment with Allegra (dosage: Dosage: 6 Tablets Three Times A Day). The following drugs were being taken at the same time: NA. When using Allegra, the patient experienced the following unwanted symptoms/side effects: Gastric UlcerAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Gastric Ulcer, may become evident only after a product is in use by the general population.
Allegra Side Effect Report#9910029
Nervousness, Heart Rate Increased, Blood Pressure Increased, Asthenia, Anxiety, Product Packaging Issue
This Nervousness side effect was reported by a consumer or non-health professional from US. A 35-year-old female patient (weight:NA) experienced the following symptoms/conditions: seasonal allergy.The patient was prescribed Allegra Allergy (drug dosage: NA), which was initiated on
Jan 21, 2014. Concurrently used drugs: NA..After starting to take Allegra Allergy the consumer reported adverse symptoms, such as: Nervousness, Heart Rate Increased, Blood Pressure Increased, Asthenia, Anxiety, Product Packaging IssueThese side effects may potentially be related to Allegra Allergy.
Allegra Side Effect Report#9877803
Nasal Cyst, Urticaria
This is a report of a 17-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: multiple allergies, who was treated with Allegra (dosage: NA, start time: NS), combined with:
  • Benadryl
and developed a serious reaction and side effect(s): Nasal Cyst, Urticaria after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in female patients, resulting in Nasal Cyst side effect.
Allegra Side Effect Report#9871679
Therapeutic Response Decreased
This report suggests a potential Allegra Therapeutic Response Decreased side effect(s) that can have serious consequences. A 3-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: house dust allergy and used Allegra (dosage: NA) starting 201205. After starting Allegra the patient began experiencing various side effects, including: Therapeutic Response DecreasedAdditional drugs used concurrently:
  • Hydrocortisone
Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Therapeutic Response Decreased, may still occur.
Allegra Side Effect Report#9871674
Oropharyngeal Pain, Extra Dose Administered
This Oropharyngeal Pain problem was reported by a consumer or non-health professional from US. A 6-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: seasonal allergy. On 201310 this consumer started treatment with Allegra (dosage: NA). The following drugs were being taken at the same time:
  • Tylenol
When using Allegra, the patient experienced the following unwanted symptoms/side effects: Oropharyngeal Pain, Extra Dose AdministeredAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Oropharyngeal Pain, may become evident only after a product is in use by the general population.
Allegra Side Effect Report#9871672
Ear Infection, Cough, Somnolence, Extra Dose Administered
This Ear Infection side effect was reported by a consumer or non-health professional from US. A 10-year-old female patient (weight:NA) experienced the following symptoms/conditions: cough.The patient was prescribed Allegra (drug dosage: Taken From: 2 Days Ago?dose:30 Mg/5ml?frequency: 2 Tsp Q12h), which was initiated on NS. Concurrently used drugs:
  • Prednisone
  • Amoxicillin
.After starting to take Allegra the consumer reported adverse symptoms, such as: Ear Infection, Cough, Somnolence, Extra Dose AdministeredThese side effects may potentially be related to Allegra.
Allegra Side Effect Report#9871663
Unevaluable Event, Rhinorrhoea, Pyrexia
This is a report of a 5-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: hypersensitivity, who was treated with Allegra (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Unevaluable Event, Rhinorrhoea, Pyrexia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in female patients, resulting in Unevaluable Event side effect.
Allegra Side Effect Report#9871661
Extra Dose Administered
This report suggests a potential Allegra Extra Dose Administered side effect(s) that can have serious consequences. A 6-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: hypersensitivity and used Allegra (dosage: NA) starting NS. After starting Allegra the patient began experiencing various side effects, including: Extra Dose AdministeredAdditional drugs used concurrently: NA. Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Extra Dose Administered, may still occur.
Allegra Side Effect Report#9855306
Chronic Obstructive Pulmonary Disease, Spinocerebellar Ataxia, Glaucoma, Reflux Laryngitis, Hypertension, Benign Prostatic Hyperplasia, Hypersensitivity, Asthma, Rhinitis
This Chronic Obstructive Pulmonary Disease problem was reported by a consumer or non-health professional from US. A 75-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: hypersensitivity,asthma. On
Feb 02, 2014 this consumer started treatment with Allegra (dosage: NA). The following drugs were being taken at the same time: NA. When using Allegra, the patient experienced the following unwanted symptoms/side effects: Chronic Obstructive Pulmonary Disease, Spinocerebellar Ataxia, Glaucoma, Reflux Laryngitis, Hypertension, Benign Prostatic Hyperplasia, Hypersensitivity, Asthma, RhinitisAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Chronic Obstructive Pulmonary Disease, may become evident only after a product is in use by the general population.
Allegra Side Effect Report#9838115
Functional Gastrointestinal Disorder, Peripheral Arterial Occlusive Disease, Intestinal Obstruction, Pruritus
This Functional Gastrointestinal Disorder side effect was reported by a consumer or non-health professional from US. A 80-year-old female patient (weight:NA) experienced the following symptoms/conditions: multiple allergies.The patient was prescribed Allegra D (drug dosage: Dose: 2 Weekly), which was initiated on 2007. Concurrently used drugs:
  • Plavix (Dose 75)
  • Lorazepam (Dose 0.5)
  • Zantac (Dose 300)
  • Hydrochlorothiazide
  • Norvasc (Dose 5)
  • Metformin (Dose- 1000)
  • Glyburide (Dose 5)
  • Aspirin
.After starting to take Allegra D the consumer reported adverse symptoms, such as: Functional Gastrointestinal Disorder, Peripheral Arterial Occlusive Disease, Intestinal Obstruction, PruritusThese side effects may potentially be related to Allegra D.
Allegra Side Effect Report#9787869
Myelodysplastic Syndrome, Neutropenia, White Blood Cell Count Decreased, Haematocrit Decreased, Haemoglobin Decreased, Lymphocyte Count Decreased
This is a report of a 71-year-old male patient (weight: NA) from JP, suffering from the following health symptoms/conditions: NA, who was treated with Allegra (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Myelodysplastic Syndrome, Neutropenia, White Blood Cell Count Decreased, Haematocrit Decreased, Haemoglobin Decreased, Lymphocyte Count Decreased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in male patients, resulting in Myelodysplastic Syndrome side effect.
Allegra Side Effect Report#9787702
Malaise, Dyspnoea, Swelling Face, Erythema, Syncope, Dysphonia, Laryngeal Oedema, Erythema, Vertigo
This report suggests a potential Allegra Malaise side effect(s) that can have serious consequences. A 41-year-old female patient (weight: NA) from BR was diagnosed with the following symptoms/conditions: hypersensitivity and used Allegra (dosage: NA) starting
Dec 18, 2013. After starting Allegra the patient began experiencing various side effects, including: Malaise, Dyspnoea, Swelling Face, Erythema, Syncope, Dysphonia, Laryngeal Oedema, Erythema, VertigoAdditional drugs used concurrently: NA. Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Malaise, may still occur.
Allegra Side Effect Report#9783191
Loss Of Consciousness, Heart Rate Decreased, Abdominal Pain Upper, Feeling Abnormal, Visual Acuity Reduced
This Loss Of Consciousness problem was reported by a consumer or non-health professional from US. A 67-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: ear discomfort. On 2011 this consumer started treatment with Allegra (dosage: NA). The following drugs were being taken at the same time: NA. When using Allegra, the patient experienced the following unwanted symptoms/side effects: Loss Of Consciousness, Heart Rate Decreased, Abdominal Pain Upper, Feeling Abnormal, Visual Acuity ReducedAlthough 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.
Allegra Side Effect Report#9778715
Sleep Apnoea Syndrome, Nasal Congestion, Feeling Jittery, Nervousness, Insomnia
This Sleep Apnoea Syndrome side effect was reported by a consumer or non-health professional from US. A 79-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Allegra-d (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Allegra-d the consumer reported adverse symptoms, such as: Sleep Apnoea Syndrome, Nasal Congestion, Feeling Jittery, Nervousness, InsomniaThese side effects may potentially be related to Allegra-d.
Allegra Side Effect Report#9769470
Headache, Urticaria
This is a report of a 65-year-old female patient (weight: NA) from JP, suffering from the following health symptoms/conditions: seasonal allergy,hyperlipidaemia,tension headache,musculoskeletal stiffness, who was treated with Allegra (dosage: NA, start time:
Apr 04, 2012), combined with:
  • Epadel
  • Lioresal
  • Lioresal
and developed a serious reaction and side effect(s): Headache, Urticaria after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in female patients, resulting in Headache side effect.
Allegra Side Effect Report#9752555
Adverse Event, Depression, Nervousness, Somnolence, Headache
This report suggests a potential Allegra Adverse Event side effect(s) that can have serious consequences. A 59-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: hypersensitivity and used Allegra (dosage: NA) starting NS. After starting Allegra the patient began experiencing various side effects, including: Adverse Event, Depression, Nervousness, Somnolence, HeadacheAdditional drugs used concurrently: NA. Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Adverse Event, may still occur.
Allegra Side Effect Report#9746927
Pneumonia, Pyrexia, Cough
This Pneumonia problem was reported by a consumer or non-health professional from BR. A male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Nov 07, 2013 this consumer started treatment with Allegra (dosage: NA). The following drugs were being taken at the same time:
  • Zinnat
  • Fluticasone Propionate (One Dose In Each Nostril)
When using Allegra, the patient experienced the following unwanted symptoms/side effects: Pneumonia, Pyrexia, CoughAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Pneumonia, may become evident only after a product is in use by the general population.
Allegra Side Effect Report#9742261
Convulsion, Nausea, Dizziness
This Convulsion side effect was reported by a physician from JP. A 24-year-old male patient (weight:NA) experienced the following symptoms/conditions: rhinitis allergic.The patient was prescribed Allegra (drug dosage: NA), which was initiated on
Nov 19, 2013. Concurrently used drugs: NA..After starting to take Allegra the consumer reported adverse symptoms, such as: Convulsion, Nausea, DizzinessThese side effects may potentially be related to Allegra.
Allegra Side Effect Report#9739230
Muscular Weakness, Fatigue, Gait Disturbance, Fear Of Falling, Neoplasm Malignant, Rheumatoid Arthritis, Pollakiuria, Memory Impairment
This is a report of a 74-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: hypersensitivity, who was treated with Allegra (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Muscular Weakness, Fatigue, Gait Disturbance, Fear Of Falling, Neoplasm Malignant, Rheumatoid Arthritis, Pollakiuria, Memory Impairment after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in male patients, resulting in Muscular Weakness side effect.
Allegra Side Effect Report#9739222
Gallbladder Disorder, Hiatus Hernia, Cataract, Visual Acuity Reduced
This report suggests a potential Allegra Gallbladder Disorder side effect(s) that can have serious consequences. A 74-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: hypersensitivity and used Allegra (dosage: NA) starting NS. After starting Allegra the patient began experiencing various side effects, including: Gallbladder Disorder, Hiatus Hernia, Cataract, Visual Acuity ReducedAdditional drugs used concurrently: NA. Although Allegra demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Gallbladder Disorder, may still occur.
Allegra Side Effect Report#9735121
Pulmonary Embolism, Deep Vein Thrombosis
This Pulmonary Embolism 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: NA. On
Jan 21, 2010 this consumer started treatment with Allegra (dosage: NA). The following drugs were being taken at the same time:
  • Yaz
  • Yasmin
  • Ocella
  • Toradol (30 Mg, Unk)
  • Zofran (4 Mg, Unk)
  • Decadron (4 Mg, Unk)
  • Ropivacaine (Unk)
  • Fentanyl (50 Mcg)
When using Allegra, the patient experienced the following unwanted symptoms/side effects: Pulmonary Embolism, Deep Vein ThrombosisThe 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 Pulmonary Embolism, may become evident only after a product is in use by the general population.
Allegra Side Effect Report#9716245
Septic Shock, Pneumonia, Painful Respiration, Pneumothorax, Dyspnoea, Pneumothorax, Adverse Event, Procedural Pain
This Apparent Death side effect was reported by a consumer or non-health professional from US. A 54-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Allegra (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Advair (Dose- 500/50 Mcg (1 Puff))
  • Singulair
  • Prednisone
  • Salbutamol Sulfate
.After starting to take Allegra the consumer reported adverse symptoms, such as: Septic Shock, Pneumonia, Painful Respiration, Pneumothorax, Dyspnoea, Pneumothorax, Adverse Event, Procedural PainThese side effects may potentially be related to Allegra. The patient was hospitalized and became disabled.
Allegra Side Effect Report#9686148
Neurogenic Bladder, Urinary Retention, Dysuria
This is a report of a 48-year-old male patient (weight: NA) from JP, suffering from the following health symptoms/conditions: rhinitis allergic, who was treated with Allegra (dosage: NA, start time:
Nov 01, 2013), combined with: NA. and developed a serious reaction and side effect(s): Neurogenic Bladder, Urinary Retention, Dysuria after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Allegra treatment in male patients, resulting in Neurogenic Bladder side effect.


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The appearance of Allegra 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 Allegra Side Effects for Women?

Women Side Effects Reports
Pain 52
Nausea 45
Malaise 43
Dizziness 42
Abdominal Pain 37
Insomnia 32
Diarrhoea 30
Dyspnoea 30
Fatigue 30
Liver Disorder 30

What are common Allegra Side Effects for Men?

Men Side Effects Reports
Hepatic Function Abnormal 27
Dyspnoea 21
Alanine Aminotransferase Increased 20
Aspartate Aminotransferase Increased 20
Loss Of Consciousness 19
Dizziness 17
Malaise 17
Extra Dose Administered 14
Feeling Abnormal 13
Atrial Fibrillation 12

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.

    Allegra 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.

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    How Effective is Allegra for You?

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    Allegra Safety Alerts, Active Ingredients, Usage Information

    NDC 0088-1090
    Type HUMAN PRESCRIPTION DRUG
    Proprietary Name Allegra D-12 Hour
    Name fexofenadine hydrochloride and pseudoephedrine hydrochloride
    Dosage Form TABLET, EXTENDED RELEASE
    Route ORAL
    On market since 19971224
    Labeler sanofi-aventis U.S. LLC
    Active Ingredient(s) FEXOFENADINE HYDROCHLORIDE; PSEUDOEPHEDRINE HYDROCHLORIDE
    Strength(s) 60; 120
    Unit(s) mg/1; mg/1
    Pharma Class Histamine H1 Receptor Antagonists [MoA],Histamine-1 Receptor Antagonist [EPC],Adrenergic alpha-Agoni

    Allegra Dosage, Warnings, Usage.

    Side Effects reported to FDA: 1281

    Allegra safety alerts: No

    Reported deaths: 27

    Reported hospitalizations: 304

    Latest Allegra clinical trials

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