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Flucloxacillin Side Effects

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Common Flucloxacillin Side Effects


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

Renal Failure Acute (7)
Metabolic Acidosis (6)
Rhabdomyolysis (5)
Blood Creatine Phosphokinase Increased (5)
Diarrhoea (4)
Distal Intestinal Obstruction Syndrome (4)
Eosinophil Count Abnormal (3)
Clostridium Difficile Infection (3)
Chromaturia (3)
Abdominal Pain (3)
Melaena (3)
Gastrointestinal Haemorrhage (3)
Pain (3)
Nausea (3)
Myopathy (3)
Rash (2)
Polyuria (2)
Mobility Decreased (2)
Palpitations (2)
Polydipsia (2)

➢ 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.

Flucloxacillin Side Effects Reported to FDA



Flucloxacillin Side Effect Report#9805480
Nausea, Abdominal Pain, Diarrhoea
This is a report of a 88-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: wound infection, who was treated with Flucloxacillin (dosage: Unk, start time: 201212), combined with:
  • Co-amoxiclav
  • Clopidogrel (75 Mg, Qd)
  • Furosemide (40 Mg, Qod)
  • Furosemide (20 Mg, Qod)
  • Ramipril (1.25 Mg, Qd)
  • Bisoprolol (1.25 Mg, Bid)
  • Aspirin (75 Mg, Qd)
  • Lansoprazole (30 Mg, Qd)
and developed a serious reaction and side effect(s): Nausea, Abdominal Pain, Diarrhoea after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in female patients, resulting in Nausea side effect. The patient was hospitalized.
Flucloxacillin Side Effect Report#9456728
Anaphylactic Reaction, Myocardial Infarction
This report suggests a potential Flucloxacillin Anaphylactic Reaction side effect(s) that can have serious consequences. A 43-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: cellulitis,migraine,hypotension,anaphylactic reaction and used Flucloxacillin (dosage: Unk) starting NS. After starting Flucloxacillin the patient began experiencing various side effects, including: Anaphylactic Reaction, Myocardial InfarctionAdditional drugs used concurrently:
  • Propranolol (80 Mg, Daily)
  • Epinephrine (0.5 Ml 1:1000 Solution, 2 Doses)
  • Epinephrine
  • Lansoprazole (Unk)
  • Fexofenadine (Unk)
The patient was hospitalized. Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Anaphylactic Reaction, may still occur.
Flucloxacillin Side Effect Report#9418681
Headache, Photophobia, Dizziness, Nausea, Pain, Migraine, Chest Pain, Vomiting, Gastrooesophageal Reflux Disease
This Headache problem was reported by a consumer or non-health professional from GB. A 54-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Jul 02, 2013 this consumer started treatment with Flucloxacillin (dosage: NA). The following drugs were being taken at the same time:
  • Codeine Phosphate
  • Tramadol
  • Clindamycin
  • Paracetamol
When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Headache, Photophobia, Dizziness, Nausea, Pain, Migraine, Chest Pain, Vomiting, Gastrooesophageal Reflux DiseaseAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Headache, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#9415435
Diarrhoea, Clostridium Difficile Infection
This Diarrhoea side effect was reported by a health professional from GB. A 74-year-old patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Flucloxacillin (drug dosage: 500 Mg/kg, Qid), which was initiated on
May 25, 2011. Concurrently used drugs: NA..After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Diarrhoea, Clostridium Difficile InfectionThese side effects may potentially be related to Flucloxacillin. The patient was hospitalized.
Flucloxacillin Side Effect Report#9400332
Diarrhoea, Clostridium Difficile Infection
This is a report of a 74-year-old patient (weight: NA) from GB, suffering from the following health symptoms/conditions: NA, who was treated with Flucloxacillin (dosage: 500 Mg/kg, Qid, start time:
May 25, 2011), combined with:
  • Metronidazole (500 Mg, Tid, 500mg/100ml Infusion 100ml Bags)
  • Ceftriaxone (2 G, Bid)
and developed a serious reaction and side effect(s): Diarrhoea, Clostridium Difficile Infection after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in patients, resulting in Diarrhoea side effect. The patient was hospitalized.
Flucloxacillin Side Effect Report#9374478
Thrombocytopenia, Malaise
This report suggests a potential Flucloxacillin (flucloxacillin) Thrombocytopenia side effect(s) that can have serious consequences. A 69-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: cellulitis and used Flucloxacillin (flucloxacillin) (dosage: NA) starting
May 07, 2013. After starting Flucloxacillin (flucloxacillin) the patient began experiencing various side effects, including: Thrombocytopenia, MalaiseAdditional drugs used concurrently:
  • Simvastatin (simvastatin)
  • Quinine Sulfate
The patient was hospitalized. Although Flucloxacillin (flucloxacillin) demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Thrombocytopenia, may still occur.
Flucloxacillin Side Effect Report#9222103
Skin Necrosis, Staphylococcal Skin Infection, Bacterial Infection
This Skin Necrosis problem was reported by a health professional from GB. A 74-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: bacterial infection. On NS this consumer started treatment with Flucloxacillin (dosage: 500 Mg, Qid). The following drugs were being taken at the same time: NA. When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Skin Necrosis, Staphylococcal Skin Infection, Bacterial InfectionThe 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 Skin Necrosis, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#8910446
Metabolic Acidosis, Acidosis
This Metabolic Acidosis side effect was reported by a health professional from NL. A 72-year-old female patient (weight:NA) experienced the following symptoms/conditions: infection.The patient was prescribed Flucloxacillin (drug dosage: Unk), which was initiated on NS. Concurrently used drugs:
  • Paracetamol (Unk)
.After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Metabolic Acidosis, AcidosisThese side effects may potentially be related to Flucloxacillin. The patient was hospitalized.
Flucloxacillin Side Effect Report#8776446
Clostridium Difficile Infection, Diarrhoea
This is a report of a 91-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: NA, who was treated with Flucloxacillin (dosage: NA, start time:
Jan 04, 2011), combined with: NA. and developed a serious reaction and side effect(s): Clostridium Difficile Infection, Diarrhoea after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in female patients, resulting in Clostridium Difficile Infection side effect. The patient was hospitalized.
Flucloxacillin Side Effect Report#8634027
Gastrointestinal Haemorrhage, Melaena, Constipation, Abdominal Pain
This report suggests a potential Flucloxacillin Gastrointestinal Haemorrhage side effect(s) that can have serious consequences. A 47-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: skin infection and used Flucloxacillin (dosage: Unk) starting
Jan 19, 2012. After starting Flucloxacillin the patient began experiencing various side effects, including: Gastrointestinal Haemorrhage, Melaena, Constipation, Abdominal PainAdditional drugs used concurrently:
  • Micronor (Unk)
Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Gastrointestinal Haemorrhage, may still occur.
Flucloxacillin Side Effect Report#8482843-0
Renal Failure Acute, Eosinophil Count Abnormal
This Renal Failure Acute problem was reported by a health professional from United Kingdom. A 67-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: abscess limb. On
Apr 27, 2012 this consumer started treatment with Flucloxacillin (dosage: 500mg Oral). The following drugs were being taken at the same time:
  • Ibuprofen (200 Mg Oral)
When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Renal Failure Acute, Eosinophil Count AbnormalAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Renal Failure Acute, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#8474595-5
Renal Failure Acute
This Renal Failure Acute side effect was reported by a health professional from United Kingdom. A 87-year-old female patient (weight:NA) experienced the following symptoms/conditions: orthopedic procedure.The patient was prescribed Flucloxacillin (drug dosage: 4 G Gram(s), Intravenous (not Otherwise Specified)), which was initiated on
May 19, 2012. Concurrently used drugs:
  • Quinine Sulfate
  • Bisoprolol Fumarate
  • Levothyroxine Sodium
  • Warfarin Sodium
  • Alendronate Sodium
  • Candesartan
  • Digoxin
  • Alverine
.After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Renal Failure AcuteThese side effects may potentially be related to Flucloxacillin. The patient was hospitalized and became disabled.
Flucloxacillin Side Effect Report#8461540-1
Renal Failure Acute, Blood Creatinine Increased, Eosinophil Count Abnormal
This is a report of a 67-year-old male patient (weight: NA) from United Kingdom, suffering from the following health symptoms/conditions: abscess limb, who was treated with Flucloxacillin (dosage: NA, start time:
Apr 27, 2012), combined with:
  • Ibuprofen
and developed a serious reaction and side effect(s): Renal Failure Acute, Blood Creatinine Increased, Eosinophil Count Abnormal after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in male patients, resulting in Renal Failure Acute side effect.
Flucloxacillin Side Effect Report#8458117-0
Blood Creatinine Increased, Eosinophil Count Abnormal, Renal Failure Acute
This report suggests a potential Flucloxacillin Blood Creatinine Increased side effect(s) that can have serious consequences. A 67-year-old male patient (weight: NA) from United Kingdom was diagnosed with the following symptoms/conditions: abscess limb and used Flucloxacillin (dosage: 500 Mg, Unk) starting
Apr 27, 2012. After starting Flucloxacillin the patient began experiencing various side effects, including: Blood Creatinine Increased, Eosinophil Count Abnormal, Renal Failure AcuteAdditional drugs used concurrently:
  • Ibuprofen (200 Mg, Unk)
Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Blood Creatinine Increased, may still occur.
Flucloxacillin Side Effect Report#8443246-8
Metabolic Acidosis
This Metabolic Acidosis problem was reported by a health professional from Ireland. A 83-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Flucloxacillin (dosage: NA). The following drugs were being taken at the same time:
  • Acetaminophen
  • Irbesartan
  • Metformin Hcl
When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Metabolic AcidosisThe 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 Metabolic Acidosis, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#8438120-7
Abdominal Pain, Gastrointestinal Haemorrhage, Melaena
This Abdominal Pain side effect was reported by a health professional from United Kingdom. A 47-year-old female patient (weight:NA) experienced the following symptoms/conditions: skin infection.The patient was prescribed Flucloxacillin (drug dosage: NA), which was initiated on
Apr 29, 2012. Concurrently used drugs:
  • Micronor
  • Amoxicillin
.After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Abdominal Pain, Gastrointestinal Haemorrhage, MelaenaThese side effects may potentially be related to Flucloxacillin.
Flucloxacillin Side Effect Report#8417531-X
Acid Base Balance Abnormal, Metabolic Acidosis, Hyperkalaemia
This is a report of a 83-year-old female patient (weight: NA) from United Kingdom, suffering from the following health symptoms/conditions: wound infection, who was treated with Flucloxacillin (dosage: NA, start time: NS), combined with:
  • Metformin Hcl
  • Irbesartan
  • Acetaminophen
and developed a serious reaction and side effect(s): Acid Base Balance Abnormal, Metabolic Acidosis, Hyperkalaemia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in female patients, resulting in Acid Base Balance Abnormal side effect.
Flucloxacillin Side Effect Report#8388742-7
Metabolic Acidosis
This report suggests a potential Flucloxacillin Metabolic Acidosis side effect(s) that can have serious consequences. A 63-year-old female patient (weight: NA) from Germany was diagnosed with the following symptoms/conditions: NA and used Flucloxacillin (dosage: NA) starting NS. After starting Flucloxacillin the patient began experiencing various side effects, including: Metabolic AcidosisAdditional drugs used concurrently:
  • Metformin Hcl
  • Atorvastatin Calcium
  • Amlodipine Besylate
  • Panadeine Co (500mg Tab Is The Strength. 1df=2 Tab 6 Hourly)
  • Creon (1df=10000 Unit Nos)
Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Metabolic Acidosis, may still occur.
Flucloxacillin Side Effect Report#8358819-0
Panniculitis, Skin Mass, Oedema Peripheral, Rash
This Panniculitis problem was reported by a health professional from Portugal. A 34-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: odynophagia,pyrexia. On NS this consumer started treatment with Flucloxacillin (dosage: NA). The following drugs were being taken at the same time: NA. When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Panniculitis, Skin Mass, Oedema Peripheral, RashAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Panniculitis, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#8336589-X
Pruritus, Condition Aggravated, Burning Sensation
This Pruritus side effect was reported by a health professional from United Kingdom. A 32-year-old female patient (weight:NA) experienced the following symptoms/conditions: eczema.The patient was prescribed Flucloxacillin (drug dosage: 500 Mg, Qid), which was initiated on
Feb 15, 2012. Concurrently used drugs:
  • Protopic (1 Df, Bid)
.After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Pruritus, Condition Aggravated, Burning SensationThese side effects may potentially be related to Flucloxacillin.
Flucloxacillin Side Effect Report#8320975-8
Rash, Blister, Hypersensitivity
This is a report of a 39-year-old male patient (weight: NA) from United Kingdom, suffering from the following health symptoms/conditions: NA, who was treated with Flucloxacillin (dosage: NA, start time: NS), combined with:
  • Terbinafine Hcl
and developed a serious reaction and side effect(s): Rash, Blister, Hypersensitivity after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in male patients, resulting in Rash side effect.
Flucloxacillin Side Effect Report#8270966-0
Myopathy, Blood Creatine Phosphokinase Increased, Chromaturia, Mobility Decreased, Pneumonia
This report suggests a potential Flucloxacillin Myopathy side effect(s) that can have serious consequences. A 78-year-old male patient (weight: NA) from United Kingdom was diagnosed with the following symptoms/conditions: pneumonia and used Flucloxacillin (dosage: NA) starting NS. After starting Flucloxacillin the patient began experiencing various side effects, including: Myopathy, Blood Creatine Phosphokinase Increased, Chromaturia, Mobility Decreased, PneumoniaAdditional drugs used concurrently:
  • Fusidic Acid
  • Simvastatin
The patient was hospitalized. Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Myopathy, may still occur.
Flucloxacillin Side Effect Report#8269126-9
Chromaturia, Myopathy, Mobility Decreased, Blood Creatine Phosphokinase Increased
This Chromaturia problem was reported by a physician from United Kingdom. A 78-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: pneumonia. On NS this consumer started treatment with Flucloxacillin (dosage: NA). The following drugs were being taken at the same time:
  • Simvastatin
  • Fusidic Acid
When using Flucloxacillin, the patient experienced the following unwanted symptoms/side effects: Chromaturia, Myopathy, Mobility Decreased, Blood Creatine Phosphokinase IncreasedThe 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 Chromaturia, may become evident only after a product is in use by the general population.
Flucloxacillin Side Effect Report#8254993-5
Myopathy, Chromaturia, Blood Creatine Phosphokinase Increased
This Myopathy side effect was reported by a physician from United Kingdom. A 78-year-old male patient (weight:NA) experienced the following symptoms/conditions: pneumonia.The patient was prescribed Flucloxacillin (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Fusidic Acid
  • Simvastatin
.After starting to take Flucloxacillin the consumer reported adverse symptoms, such as: Myopathy, Chromaturia, Blood Creatine Phosphokinase IncreasedThese side effects may potentially be related to Flucloxacillin. The patient was hospitalized.
Flucloxacillin Side Effect Report#8241641-3
Weight Decreased, Polyuria, Diabetes Mellitus, Fatigue, Polydipsia, Dry Mouth
This is a report of a 46-year-old male patient (weight: NA) from United Kingdom, suffering from the following health symptoms/conditions: nail infection,hypercholesterolaemia, who was treated with Flucloxacillin (dosage: NA, start time:
Feb 08, 2012), combined with:
  • Simvastatin (Unk)
and developed a serious reaction and side effect(s): Weight Decreased, Polyuria, Diabetes Mellitus, Fatigue, Polydipsia, Dry Mouth after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Flucloxacillin treatment in male patients, resulting in Weight Decreased side effect. The patient was hospitalized and became disabled.

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The appearance of Flucloxacillin 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.


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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.

    Flucloxacillin 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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