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Flucloxacillin Side Effects

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.

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.

Flucloxacillin Side Effects Reported to FDA

The following 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.


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.
Nausea, Abdominal Pain, Diarrhoea
This is a report of a 88-year-old female patient (weight: NA) from GB, suffering from the following 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). The consumer presented with:
  • Nausea
  • Abdominal Pain
  • Diarrhoea
which developed 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.

Anaphylactic Reaction, Myocardial Infarction
This report suggests a potential Flucloxacillin Anaphylactic Reaction, Myocardial Infarction 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. Soon after starting Flucloxacillin the patient began experiencing various side effects, including:
  • Anaphylactic Reaction
  • Myocardial Infarction
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.

Headache, Photophobia, Dizziness, Nausea, Pain, Migraine, Chest Pain, Vomiting, Gastrooesophageal Reflux Disease
This Headache, Photophobia, Dizziness, Nausea, Pain, Migraine, Chest Pain, Vomiting, Gastrooesophageal Reflux Disease 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 commencing Flucloxacillin, the patient experienced the following unwanted symptoms/side effects:
  • Headache
  • Photophobia
  • Dizziness
  • Nausea
  • Pain
  • Migraine
  • Chest Pain
  • Vomiting
  • Gastrooesophageal Reflux Disease
Although 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.

Diarrhoea, Clostridium Difficile Infection
This is a report of a 74-year-old patient (weight: NA) from GB. The patient developed the following symptoms/conditions: NA and was treated with Flucloxacillin (dosage: 500 Mg/kg, Qid) starting May 25, 2011. Concurrently used drugs: NA.Soon after that, the consumer experienced the following side effects:
  • Diarrhoea
  • Clostridium Difficile Infection
The patient was hospitalized. This opens a possibility that Flucloxacillin treatment could cause the above reactions, including diarrhoea, and some subjects may be more susceptible.


Diarrhoea, Clostridium Difficile Infection
A 74-year-old patient (weight: NA) from GB with the following symptoms/conditions: NA started Flucloxacillin treatment (dosage: 500 Mg/kg, Qid) on May 25, 2011. Soon after starting Flucloxacillin treatment, the subject experienced various side effects, including:
  • Diarrhoea
  • Clostridium Difficile Infection
Concurrently used drugs:
  • Metronidazole (500 Mg, Tid, 500mg/100ml Infusion 100ml Bags)
  • Ceftriaxone (2 G, Bid)
The patient was hospitalized. This finding indicates that some patients could be more vulnerable to Flucloxacillin.

Thrombocytopenia, Malaise
A 69-year-old male patient from GB (weight: NA) experienced symptoms, such as: cellulitis and was treated with Flucloxacillin (flucloxacillin)(dosage: NA). The treatment was initiated on May 07, 2013. After that a consumer reported the following side effect(s):
  • Thrombocytopenia
  • Malaise
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Flucloxacillin (flucloxacillin) efficacy:
  • Simvastatin (simvastatin)
  • Quinine Sulfate
The patient was hospitalized.

Skin Necrosis, Staphylococcal Skin Infection, Bacterial Infection
In this report, Flucloxacillin was administered for the following condition: bacterial infection.A 74-year-old male consumer from GB (weight: NA) started Flucloxacillin treatment (dosage: 500 Mg, Qid) on NS.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Skin Necrosis
  • Staphylococcal Skin Infection
  • Bacterial Infection
A possible interaction with other drugs could have contributed to this reaction: NA.The patient was hospitalized.Establishing a causal relationship between a specific drug and consumer's side effects is complex, but it is possible that in this report Flucloxacillin treatment could be related to the listed above side effect(s).

Metabolic Acidosis
This is a report of the following Flucloxacillin side effect(s):
  • Metabolic Acidosis
A 72-year-old female patient from NL (weight: NA) presented with the following condition: infection and received a treatment with Flucloxacillin (dosage: Unk) starting: NS.The following concurrently used drugs could have generated interactions:
  • Paracetamol (Unk)
The patient was hospitalized.This report suggests that a Flucloxacillin treatment could be associated with the listed above side effect(s).

Clostridium Difficile Infection, Diarrhoea
This Flucloxacillin report was submitted by a 91-year-old female consumer from GB (weight: NA). The patient was diagnosed with: NA and Flucloxacillin was administered (dosage: NA) starting: Jan 04, 2011. The consumer developed a set of symptoms:
  • Clostridium Difficile Infection
  • Diarrhoea
Other drugs used simultaneously: NA.The patient was hospitalized.Those unexpected symptoms could be linked to a Flucloxacillin treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Gastrointestinal Haemorrhage, Melaena, Constipation, Abdominal Pain
This is a report of a possible correlation between Flucloxacillin use and the following symptoms/side effect(s):
  • Gastrointestinal Haemorrhage
  • Melaena
  • Constipation
  • Abdominal Pain
which could contribute to an assessment of Flucloxacillin risk profile.A 47-year-old female consumer from GB (weight: NA) was suffering from skin infection and was treated with Flucloxacillin (dosage: Unk) starting Jan 19, 2012.Other concurrent medications:
  • Micronor (Unk)


Renal Failure Acute, Eosinophil Count Abnormal
A 67-year-old male patient from UNITED KINGDOM (weight: NA) presented with the following symptoms: abscess limb and after a treatment with Flucloxacillin (dosage: 500mg Oral) experienced the following side effect(s):
  • Renal Failure Acute
  • Eosinophil Count Abnormal
The treatment was started on Apr 27, 2012. Flucloxacillin was used in combination with the following drugs:
  • Ibuprofen (200 Mg Oral)
This report could alert potential Flucloxacillin consumers.

Renal Failure Acute
In this report, a 87-year-old female patient from UNITED KINGDOM (weight: NA) was affected by a possible Flucloxacillin side effect.The patient was diagnosed with orthopedic procedure. After a treatment with Flucloxacillin (dosage: 4 G Gram(s), Intravenous (not Otherwise Specified), start date: May 19, 2012), the patient experienced the following side effect(s):
  • Renal Failure Acute
The following simultaneously used drugs could have led to this reaction:
  • Quinine Sulfate
  • Bisoprolol Fumarate
  • Levothyroxine Sodium
  • Warfarin Sodium
  • Alendronate Sodium
  • Candesartan
  • Digoxin
  • Alverine
The patient was hospitalized and became disabled.The findings here stress that side effects should be taken into consideration when evaluating a Flucloxacillin treatment.

Renal Failure Acute, Blood Creatinine Increased, Eosinophil Count Abnormal
This is a report of a 67-year-old male patient from UNITED KINGDOM (weight: NA), who used Flucloxacillin (dosage: NA) for a treatment of abscess limb. After starting a treatment on Apr 27, 2012, the patient experienced the following side effect(s):
  • Renal Failure Acute
  • Blood Creatinine Increased
  • Eosinophil Count Abnormal
The following drugs could possibly have interacted with the Flucloxacillin treatment
  • Ibuprofen
Taken together, these observations suggest that a Flucloxacillin treatment could be related to side effect(s), such as Renal Failure Acute, Blood Creatinine Increased, Eosinophil Count Abnormal.

Blood Creatinine Increased, Eosinophil Count Abnormal, Renal Failure Acute
This blood creatinine increased side effect was reported by a health professional from UNITED KINGDOM. A 67-year-old male patient (weight:NA) experienced the following symptoms/conditions: abscess limb. The patient was prescribed Flucloxacillin (dosage: 500 Mg, Unk), which was started on Apr 27, 2012. Concurrently used drugs:
  • Ibuprofen (200 Mg, Unk)
When starting to take Flucloxacillin the consumer reported the following symptoms:
  • Blood Creatinine Increased
  • Eosinophil Count Abnormal
  • Renal Failure Acute
These side effects may potentially be related to Flucloxacillin.

Metabolic Acidosis
This is a Flucloxacillin side effect report of a 83-year-old female patient (weight:NA) from IRELAND, suffering from the following symptoms/conditions: NA, who was treated with Flucloxacillin (dosage:NA, start time: NS), combined with:
  • Acetaminophen
  • Irbesartan
  • Metformin Hcl
, and developed a serious reaction and a metabolic acidosis side effect. The patient presented with:
  • Metabolic Acidosis
which developed after the beginning of treatment. The patient was hospitalized. This side effect report can indicate a possible existence of increased vulnerability to Flucloxacillin treatment in female patients suffering from NA, resulting in metabolic acidosis.

Abdominal Pain, Gastrointestinal Haemorrhage, Melaena
This report suggests a potential Flucloxacillin abdominal pain side effect(s) that can have serious consequences. A 47-year-old female patient from UNITED KINGDOM (weight:NA) was diagnosed with the following health condition(s): skin infection and used Flucloxacillin (dosage: NA) starting Apr 29, 2012. Soon after starting Flucloxacillin the patient began experiencing various side effects, including:
  • Abdominal Pain
  • Gastrointestinal Haemorrhage
  • Melaena
Drugs used concurrently:
  • Micronor
  • Amoxicillin
Although Flucloxacillin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as abdominal pain, may still occur.

Acid Base Balance Abnormal, Metabolic Acidosis, Hyperkalaemia
This acid base balance abnormal problem was reported by a health professional from UNITED KINGDOM. A 83-year-old female patient (weight: NA) was diagnosed with the following medical condition(s): wound infection.On NS a consumer started treatment with Flucloxacillin (dosage: NA). The following drugs/medications were being taken at the same time:
  • Metformin Hcl
  • Irbesartan
  • Acetaminophen
When commencing Flucloxacillin, the patient experienced the following unwanted symptoms /side effects:
  • Acid Base Balance Abnormal
  • Metabolic Acidosis
  • Hyperkalaemia
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as acid base balance abnormal, may become evident only after a product is in use by the general population.

Metabolic Acidosis
This is a Flucloxacillin side effect report of a 63-year-old female patient (weight: NA) from GERMANY. The patient developed the following symptoms/conditions: NA and was treated with Flucloxacillin (dosage: NA) starting NS. Concurrently used drugs:
  • Metformin Hcl
  • Atorvastatin Calcium
  • Amlodipine Besylate
  • Panadeine Co (500mg Tab Is The Strength. 1df=2 Tab 6 Hourly)
  • Creon (1df=10000 Unit Nos)
Soon after that, the consumer experienced the following of symptoms:
  • Metabolic Acidosis
This opens a possibility that Flucloxacillin could cause metabolic acidosis and that some female patients may be more susceptible.

Panniculitis, Skin Mass, Oedema Peripheral, Rash
A 34-year-old female patient (weight: NA) from PORTUGAL with the following symptoms: odynophagia,pyrexia started Flucloxacillin treatment (dosage: NA) on NS. Soon after starting Flucloxacillin treatment, the consumer experienced several side effects, including:
  • Panniculitis
  • Skin Mass
  • Oedema Peripheral
  • Rash
. Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Flucloxacillin side effects, such as panniculitis.

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 (dosage: 500 Mg, Qid), which was started on Feb 15, 2012. Concurrently used drugs:
  • Protopic (1 Df, Bid)
.When starting to take Flucloxacillin the consumer reported symptoms, such as:
  • Pruritus
  • Condition Aggravated
  • Burning Sensation
These side effects may potentially be related to Flucloxacillin.

Rash, Blister, Hypersensitivity
This is a report of a 39-year-old male patient (weight: NA) from UNITED KINGDOM, suffering from the following 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). The consumer presented with:
  • Rash
  • Blister
  • Hypersensitivity
which developed 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.

Myopathy, Blood Creatine Phosphokinase Increased, Chromaturia, Mobility Decreased, Pneumonia
This report suggests a potential Flucloxacillin Myopathy, Blood Creatine Phosphokinase Increased, Chromaturia, Mobility Decreased, Pneumonia 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. Soon after starting Flucloxacillin the patient began experiencing various side effects, including:
  • Myopathy
  • Blood Creatine Phosphokinase Increased
  • Chromaturia
  • Mobility Decreased
  • Pneumonia
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.

Chromaturia, Myopathy, Mobility Decreased, Blood Creatine Phosphokinase Increased
This Chromaturia, Myopathy, Mobility Decreased, Blood Creatine Phosphokinase Increased 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 commencing Flucloxacillin, the patient experienced the following unwanted symptoms/side effects:
  • Chromaturia
  • Myopathy
  • Mobility Decreased
  • Blood Creatine Phosphokinase Increased
The 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.

Myopathy, Chromaturia, Blood Creatine Phosphokinase Increased
This is a report of a 78-year-old male patient (weight: NA) from UNITED KINGDOM. The patient developed the following symptoms/conditions: pneumonia and was treated with Flucloxacillin (dosage: NA) starting NS. Concurrently used drugs:
  • Fusidic Acid
  • Simvastatin
Soon after that, the consumer experienced the following side effects:
  • Myopathy
  • Chromaturia
  • Blood Creatine Phosphokinase Increased
The patient was hospitalized. This opens a possibility that Flucloxacillin treatment could cause the above reactions, including myopathy, and some male subjects may be more susceptible.

Weight Decreased, Polyuria, Diabetes Mellitus, Fatigue, Polydipsia, Dry Mouth
A 46-year-old male patient (weight: NA) from UNITED KINGDOM with the following symptoms/conditions: nail infection,hypercholesterolaemia started Flucloxacillin treatment (dosage: NA) on Feb 08, 2012. Soon after starting Flucloxacillin treatment, the subject experienced various side effects, including:
  • Weight Decreased
  • Polyuria
  • Diabetes Mellitus
  • Fatigue
  • Polydipsia
  • Dry Mouth
Concurrently used drugs:
  • Simvastatin (Unk)
The patient was hospitalized and became disabled. This finding indicates that some male patients could be more vulnerable to Flucloxacillin.

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Note Your Observations

It is really important to keep of your 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

    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.


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