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Norflex Side Effects

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Common Norflex Side Effects


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

Pulmonary Embolism (3)
Fall (2)
Hypersensitivity (2)
Dyspnoea (2)
Urinary Retention (2)
Pain (2)
Injury (2)
Lumbar Vertebral Fracture (1)
Paranasal Sinus Hypersecretion (1)
Pain In Extremity (1)
Pyrexia (1)
Lung Disorder (1)
Withdrawal Syndrome (1)
Obstructive Airways Disorder (1)
Oedema Peripheral (1)
Ovarian Cyst (1)
Neoplasm (1)
Nasopharyngitis (1)
Musculoskeletal Discomfort (1)
Mental Disorder (1)

➢ 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.

Norflex Side Effects Reported to FDA



Norflex Side Effect Report#8366506-8
Renal Failure Acute, Blood Creatinine Increased
This is a report of a 50-year-old male patient (weight: NA) from United States, suffering from the following health symptoms/conditions: NA, who was treated with Norflex (orphenadrine Citrate)(100 Milligram, Tablets (dosage: NA, start time:
Mar 07, 2011), combined with:
  • Folic Acid (folic Acid)(1 Milligram, Tablets)
  • Lisinopril (lisinopril)(2.5 Milligram, Tablets)
and developed a serious reaction and side effect(s): Renal Failure Acute, Blood Creatinine Increased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Norflex (orphenadrine Citrate)(100 Milligram, Tablets treatment in male patients, resulting in Renal Failure Acute side effect. The patient was hospitalized.
Norflex Side Effect Report#8260130-3
Ear Infection
This report suggests a potential Norflex Ear Infection side effect(s) that can have serious consequences. A female patient (weight: NA) from United States was diagnosed with the following symptoms/conditions: inflammation,thyroidectomy,nerve injury and used Norflex (dosage: Unk) starting
Feb 01, 2012. After starting Norflex the patient began experiencing various side effects, including: Ear InfectionAdditional drugs used concurrently:
  • Levothyroxine (Unk)
  • Lyrica (Unk)
  • Cymbalta (Unk)
  • Lipitor (20 Mg, 1x/day)
  • Potassium (Unk)
Although Norflex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Ear Infection, may still occur.
Norflex Side Effect Report#8249282-9
Pulmonary Embolism
This Pulmonary Embolism problem was reported by a physician from United States. A 21-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Feb 22, 2011 this consumer started treatment with Norflex (dosage: 60 Mg, Unk). The following drugs were being taken at the same time:
  • Toradol (60 Mg, Unk)
  • Multi-vitamin (1 Tablet Daily)
  • Yaz
  • Fastin (30 Mg, Unk)
  • Vicodin (Unk)
When using Norflex, the patient experienced the following unwanted symptoms/side effects: Pulmonary EmbolismThe 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.
Norflex Side Effect Report#8129713-5
Injection Site Pain, Urticaria, Nasopharyngitis, Paranasal Sinus Hypersecretion, Blood Pressure Increased, Pyrexia, Ovarian Cyst
This Injection Site Pain side effect was reported by a consumer or non-health professional from United States. A 45-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Norflex (drug dosage: NA), which was initiated on
Jun 01, 2011. Concurrently used drugs:
  • Humira (Twice Weekly, Every Monday And Thursday)
  • Humira
  • Muscle Relaxants
.After starting to take Norflex the consumer reported adverse symptoms, such as: Injection Site Pain, Urticaria, Nasopharyngitis, Paranasal Sinus Hypersecretion, Blood Pressure Increased, Pyrexia, Ovarian CystThese side effects may potentially be related to Norflex.
Norflex Side Effect Report#8102140-2
Withdrawal Syndrome, Hypersensitivity, Urinary Retention, Tremor, Agitation, Restlessness, Lethargy, Injury
This is a report of a 38-year-old female patient (weight: NA) from United States, suffering from the following health symptoms/conditions: NA, who was treated with Norflex (dosage: NA, start time: NS), combined with:
  • Celebrex (In Mrng)
  • Lexapro
  • Zolpidem (At Nyt)
  • Abilify (2mg Daily For 2 Days Then 5mg)
  • Tramadol Hcl (Pill)
  • Topamax (A Supper Time 20mg)
  • Clonazepam (1df-0.5 Units Nt Specified At Nyt)
and developed a serious reaction and side effect(s): Withdrawal Syndrome, Hypersensitivity, Urinary Retention, Tremor, Agitation, Restlessness, Lethargy, Injury after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Norflex treatment in female patients, resulting in Withdrawal Syndrome side effect. The patient was hospitalized.
Norflex Side Effect Report#7832343-3
Pulmonary Embolism, Injury, Pain
This report suggests a potential Norflex Pulmonary Embolism side effect(s) that can have serious consequences. A 24-year-old female patient (weight: NA) from United States was diagnosed with the following symptoms/conditions: NA and used Norflex (dosage: NA) starting
Jun 01, 2009. After starting Norflex the patient began experiencing various side effects, including: Pulmonary Embolism, Injury, PainAdditional drugs used concurrently:
  • Flexeril
  • Yaz (Unk)
  • Toradol
  • Naproxen
  • Benadryl
Although Norflex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pulmonary Embolism, may still occur.
Norflex Side Effect Report#7603033-7
Insomnia, Urinary Retention, Somnolence, Dry Mouth, Breath Odour
This Insomnia problem was reported by a consumer or non-health professional from United States. A 73-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: muscle strain. On
Jul 07, 2011 this consumer started treatment with Norflex (dosage: 100 Mgs). The following drugs were being taken at the same time: NA. When using Norflex, the patient experienced the following unwanted symptoms/side effects: Insomnia, Urinary Retention, Somnolence, Dry Mouth, Breath OdourAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Insomnia, may become evident only after a product is in use by the general population.
Norflex Side Effect Report#7501912-2
Abdominal Pain Upper, Diarrhoea, Lung Disorder
This Abdominal Pain Upper side effect was reported by a consumer or non-health professional from United States. A male patient (weight:NA) experienced the following symptoms/conditions: pain,oropharyngeal pain.The patient was prescribed Norflex (drug dosage: 100mg 2 A Day), which was initiated on
Sep 09, 2010. Concurrently used drugs:
  • Amoxicillin And Clavulanate Potassium (875mg/ 125mg Twice Daily)
  • Amoxicillin And Clavulanate Potassium (875mg/ 125mg Twice Daily)
.After starting to take Norflex the consumer reported adverse symptoms, such as: Abdominal Pain Upper, Diarrhoea, Lung DisorderThese side effects may potentially be related to Norflex. The patient was hospitalized.
Norflex Side Effect Report#7490441-0
Limb Discomfort, Fall, Arthralgia
This is a report of a female patient (weight: NA) from United States, suffering from the following health symptoms/conditions: back pain, who was treated with Norflex (dosage: Unk, start time:
Feb 01, 2011), combined with:
  • Vistaril (Unk)
  • Vistaril
and developed a serious reaction and side effect(s): Limb Discomfort, Fall, Arthralgia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Norflex treatment in female patients, resulting in Limb Discomfort side effect.
Norflex Side Effect Report#7436889-1
Pain In Extremity, Mental Disorder, Headache, Deep Vein Thrombosis, Dyspnoea, Oedema Peripheral, Pulmonary Embolism
This report suggests a potential Norflex Pain In Extremity side effect(s) that can have serious consequences. A 32-year-old female patient (weight: NA) from United States was diagnosed with the following symptoms/conditions: NA and used Norflex (dosage: NA) starting
Apr 01, 2007. After starting Norflex the patient began experiencing various side effects, including: Pain In Extremity, Mental Disorder, Headache, Deep Vein Thrombosis, Dyspnoea, Oedema Peripheral, Pulmonary EmbolismAdditional drugs used concurrently:
  • Nonsteroidals
  • Jasmine
  • Yasmin (Unk Unk, Qd)
  • Anaprox (It Will Need To Stop When Her Inr Is Therapeutic)
  • Flexeril
The patient was hospitalized. Although Norflex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pain In Extremity, may still occur.
Norflex Side Effect Report#7209677-9
Swelling Face, Hypersensitivity, Dyspnoea, Obstructive Airways Disorder
This Swelling Face problem was reported by a consumer or non-health professional from United States. A female patient (weight: NA) was diagnosed with the following symptoms/conditions: fibromyalgia,diabetes mellitus. On
Mar 01, 2010 this consumer started treatment with Norflex (dosage: 100 Mg, 2x/day). The following drugs were being taken at the same time:
  • Sitagliptin (100 Mg, 1x/day)
  • Effexor (100 Mg, 1x/day)
  • Sectral (Unk)
  • Albuterol Sulfate (90 Ug, As Needed)
  • Levothyroxine (150 Ug, 1x/day)
  • Benicar Hct (40/25 Mg)
  • Zyrtec (Unk)
  • Benadryl (Unk)
When using Norflex, the patient experienced the following unwanted symptoms/side effects: Swelling Face, Hypersensitivity, Dyspnoea, Obstructive Airways DisorderAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Swelling Face, may become evident only after a product is in use by the general population.
Norflex Side Effect Report#6211047-7
Clavicle Fracture, Confusional State, Delirium, Fall, Hallucination, Lumbar Vertebral Fracture, Spinal Compression Fracture, Thoracic Vertebral Fracture
This Clavicle Fracture side effect was reported by a physician from United States. A 86-year-old male patient (weight:NA) experienced the following symptoms/conditions: muscle strain.The patient was prescribed Norflex (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Norflex the consumer reported adverse symptoms, such as: Clavicle Fracture, Confusional State, Delirium, Fall, Hallucination, Lumbar Vertebral Fracture, Spinal Compression Fracture, Thoracic Vertebral FractureThese side effects may potentially be related to Norflex. The patient was hospitalized.
Norflex Side Effect Report#5230441-4
Hypoaesthesia, Musculoskeletal Discomfort, Neoplasm, Pain
This is a report of a 40-year-old male patient (weight: NA) from Finland, suffering from the following health symptoms/conditions: back pain, who was treated with Norflex (dosage: (60 Mg, Single Dose), start time:
Nov 26, 2006), combined with:
  • Voltaren ((75 Mg, Single Dose))
  • Burana
and developed a serious reaction and side effect(s): Hypoaesthesia, Musculoskeletal Discomfort, Neoplasm, Pain after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Norflex treatment in male patients, resulting in Hypoaesthesia side effect. The patient was hospitalized and became disabled.
Norflex Side Effect Report#4842469-4
Alcohol Use, Cardiac Failure Congestive
This report suggests a potential Norflex Alcohol Use side effect(s) that can have serious consequences. A 48-year-old female patient (weight: NA) from United States was diagnosed with the following symptoms/conditions: back pain and used Norflex (dosage: (100 Mg, 2 In 1 Day(s)), Oral) starting
Nov 01, 1999. After starting Norflex the patient began experiencing various side effects, including: Alcohol Use, Cardiac Failure CongestiveAdditional drugs used concurrently:
  • Xanax
  • Restoril
Although Norflex demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Alcohol Use, may still occur.
Norflex Side Effect Report#4777938-9
Angina Pectoris, Anxiety
This Angina Pectoris problem was reported by a consumer or non-health professional from United States. A 65-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: back disorder,neck injury,surgery. On
Oct 19, 2004 this consumer started treatment with Norflex (dosage: 100 Mg 1 In 1 Day(s), Oral). The following drugs were being taken at the same time: NA. When using Norflex, the patient experienced the following unwanted symptoms/side effects: Angina Pectoris, AnxietyThe 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 Angina Pectoris, may become evident only after a product is in use by the general population.



The appearance of Norflex 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 Norflex Side Effects for Women?

Women Side EffectsReports
Pulmonary Embolism 3
Dyspnoea 2
Hypersensitivity 2
Injury 2
Urinary Retention 2
Agitation 1
Alcohol Use 1
Angina Pectoris 1
Anxiety 1
Arthralgia 1

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.

    Norflex 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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    Norflex Safety Alerts, Active Ingredients, Usage Information

    Norflex Dosage, Warnings, Usage.

    Side Effects reported to FDA: 15

    Norflex safety alerts: No

    Reported deaths: 1

    Reported hospitalizations: 7

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