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Cefalexin Side Effects

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Common Cefalexin Side Effects


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

Treatment Failure (11)
Pneumonia (8)
Arthralgia (5)
Erythema (5)
Malaise (5)
Headache (5)
Urticaria (4)
Stevens-johnson Syndrome (4)
Somnolence (4)
Rash (4)
Pain (3)
Pruritus (3)
Mouth Ulceration (3)
Conjunctival Haemorrhage (3)
Systemic Inflammatory Response Syndrome (3)
Dizziness (3)
Jaundice Cholestatic (3)
Haematuria (3)
Gingival Bleeding (3)
International Normalised Ratio Increased (3)

➢ 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.

Cefalexin Side Effects Reported to FDA



Cefalexin Side Effect Report#9819365
Urticaria
This is a report of a 6-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: NA, who was treated with Cefalexin (dosage: NA, start time:
Dec 17, 2013), combined with:
  • Clarithromycin (clarithromycin)
and developed a serious reaction and side effect(s): Urticaria after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin treatment in female patients, resulting in Urticaria side effect.
Cefalexin Side Effect Report#9726395
Jaundice Cholestatic
This report suggests a potential Cefalexin Jaundice Cholestatic side effect(s) that can have serious consequences. A 83-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: urinary tract infection and used Cefalexin (dosage: 1500 Mg (500 Mg, 3 In 1 D), Oral) starting
Oct 25, 2013. After starting Cefalexin the patient began experiencing various side effects, including: Jaundice CholestaticAdditional drugs used concurrently:
  • Bisoprolol
  • Co-codamol
  • Cyclizine
  • Fultium
  • Metoclopramide
The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Jaundice Cholestatic, may still occur.
Cefalexin Side Effect Report#9725201
Jaundice Cholestatic, Liver Function Test Abnormal
This Jaundice Cholestatic problem was reported by a health professional from GB. A 83-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection. On
Oct 25, 2013 this consumer started treatment with Cefalexin (dosage: 500 Mg, Tid). The following drugs were being taken at the same time:
  • Bisoprolol
  • Cyclizine
  • Fultium
  • Metoclopramide
  • Co-codamol
When using Cefalexin, the patient experienced the following unwanted symptoms/side effects: Jaundice Cholestatic, Liver Function Test AbnormalThe 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 Jaundice Cholestatic, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9670190
Urticaria, Discomfort
This Urticaria side effect was reported by a consumer or non-health professional from US. A 2.-year-old female patient (weight:NA) experienced the following symptoms/conditions: urinary tract infection,pyrexia.The patient was prescribed Cefalexin (drug dosage: 250mg/5ml), which was initiated on
Oct 03, 2013. Concurrently used drugs: NA..After starting to take Cefalexin the consumer reported adverse symptoms, such as: Urticaria, DiscomfortThese side effects may potentially be related to Cefalexin. The patient was hospitalized.
Cefalexin Side Effect Report#9625731
Anaphylactic Reaction, Fall, Malaise, Retching
This is a report of a 68-year-old male patient (weight: NA) from AU, suffering from the following health symptoms/conditions: NA, who was treated with Cefalexin (dosage: Unk, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Anaphylactic Reaction, Fall, Malaise, Retching after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin treatment in male patients, resulting in Anaphylactic Reaction side effect.
Cefalexin Side Effect Report#9563551
Chills, Cough, Hyperhidrosis, Treatment Failure
This report suggests a potential Cefalexin Chills side effect(s) that can have serious consequences. A 89-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: lower respiratory tract infection and used Cefalexin (dosage: NA) starting
Jun 04, 2011. After starting Cefalexin the patient began experiencing various side effects, including: Chills, Cough, Hyperhidrosis, Treatment FailureAdditional drugs used concurrently:
  • Laxido (electrolytes Nos W/macrogol 3350)
  • Paracetamol (pracetamol)
  • Serevent (salmeterol Xinafoate)
  • Temazepam (temazepam)
  • Tiotropium (tiotropium)
  • Zomoroph (morphine Sulfate)
The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Chills, may still occur.
Cefalexin Side Effect Report#9563550
Clostridium Difficile Infection
This Clostridium Difficile Infection problem was reported by a consumer or non-health professional from GB. A 78-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Feb 10, 2012 this consumer started treatment with Cefalexin (cefalexin) (dosage: NA). The following drugs were being taken at the same time:
  • Calceos (lekovit Ca)
  • Madopar (madopar)
  • Rivastigmine (rivastigmine)
  • Viscotears (carbomer)
When using Cefalexin (cefalexin), the patient experienced the following unwanted symptoms/side effects: Clostridium Difficile 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 Clostridium Difficile Infection, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9563514
Pneumonia, Treatment Failure
This Pneumonia side effect was reported by a pharmacist from GB. A 86-year-old female patient (weight:NA) experienced the following symptoms/conditions: lower respiratory tract infection.The patient was prescribed Cefalexin (drug dosage: 1000 Mg (250 Mg, 4 In 1 D), Oral), which was initiated on
Oct 16, 2012. Concurrently used drugs: NA..After starting to take Cefalexin the consumer reported adverse symptoms, such as: Pneumonia, Treatment FailureThese side effects may potentially be related to Cefalexin. The patient was hospitalized.
Cefalexin Side Effect Report#9559831
Chills, Treatment Failure, Cough, Hyperhidrosis
This is a report of a 89-year-old male patient (weight: NA) from GB, suffering from the following health symptoms/conditions: lower respiratory tract infection, who was treated with Cefalexin (dosage: 250 Mg, Qid, start time:
Jun 04, 2011), combined with:
  • Laxido (Unk)
  • Paracetamol
  • Serevent (2 Df, Bid)
  • Temazepam
  • Tiotropium (18 ?g, Qd)
  • Zomorph (30 Mg, Bid)
and developed a serious reaction and side effect(s): Chills, Treatment Failure, Cough, Hyperhidrosis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin treatment in male patients, resulting in Chills side effect. The patient was hospitalized.
Cefalexin Side Effect Report#9559817
Treatment Failure, Pneumonia
This report suggests a potential Cefalexin Treatment Failure side effect(s) that can have serious consequences. A 86-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: lower respiratory tract infection and used Cefalexin (dosage: 250 Mg, Qid) starting
Oct 16, 2012. After starting Cefalexin the patient began experiencing various side effects, including: Treatment Failure, PneumoniaAdditional drugs used concurrently: NA.The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Treatment Failure, may still occur.
Cefalexin Side Effect Report#9542143
Treatment Failure, Neutrophilia, Chronic Obstructive Pulmonary Disease
This Treatment Failure problem was reported by a pharmacist from GB. A 78-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: chronic obstructive pulmonary disease,infection. On 201210 this consumer started treatment with Cefalexin (dosage: 1500 Mg (500 Mg,3 In 1 D)). The following drugs were being taken at the same time: NA. When using Cefalexin, the patient experienced the following unwanted symptoms/side effects: Treatment Failure, Neutrophilia, Chronic Obstructive Pulmonary DiseaseThe 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 Treatment Failure, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9541786
Treatment Failure, Malaise, Pneumonia, Systemic Inflammatory Response Syndrome
This Treatment Failure side effect was reported by a pharmacist from GB. A 71-year-old female patient (weight:NA) experienced the following symptoms/conditions: lower respiratory tract infection.The patient was prescribed Cefalexin (drug dosage: 750 Mg (250 Mg,3 In 1 D)), which was initiated on 201302. Concurrently used drugs:
  • Co-amlofruse (frumil)
  • Co-codamol (panadeine Co)
  • Folic Acid (folic Acid)
  • Methotrexate (methotrexate)
  • Seretide (sertide)
  • Tiotropium Bromide (tiotropium Bromide)
.After starting to take Cefalexin the consumer reported adverse symptoms, such as: Treatment Failure, Malaise, Pneumonia, Systemic Inflammatory Response SyndromeThese side effects may potentially be related to Cefalexin. The patient was hospitalized.
Cefalexin Side Effect Report#9538718
Face Oedema, Headache, Nausea, Paraesthesia, Paraesthesia Oral
This is a report of a 27-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: urinary tract infection, who was treated with Cefalexin (dosage: Unk, start time:
Aug 20, 2013), combined with: NA. and developed a serious reaction and side effect(s): Face Oedema, Headache, Nausea, Paraesthesia, Paraesthesia Oral after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin treatment in female patients, resulting in Face Oedema side effect. The patient was hospitalized.
Cefalexin Side Effect Report#9538672
Treatment Failure
This report suggests a potential Cefalexin Treatment Failure side effect(s) that can have serious consequences. A 78-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: infective exacerbation of chronic obstructive airways disease and used Cefalexin (dosage: 500 Mg, Tid) starting 201210. After starting Cefalexin the patient began experiencing various side effects, including: Treatment FailureAdditional drugs used concurrently:
  • Alendronic Acid (70 Mg, 1/week)
  • Atorvastatin (20 Mg, Qd)
  • Doxycycline
  • Nicorandil (10 Mg, Bid)
  • Phyllocontin Continus (225 Mg, Bid)
  • Prednisolone (15 Mg, Qd)
  • Temazepam (10 Mg, Qd)
The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Treatment Failure, may still occur.
Cefalexin Side Effect Report#9536737
Pneumonia, Systemic Inflammatory Response Syndrome, Treatment Failure, Malaise
This Pneumonia problem was reported by a health professional from GB. A 71-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: lower respiratory tract infection. On 201302 this consumer started treatment with Cefalexin (dosage: 250 Mg, Tid). The following drugs were being taken at the same time: NA. When using Cefalexin, the patient experienced the following unwanted symptoms/side effects: Pneumonia, Systemic Inflammatory Response Syndrome, Treatment Failure, MalaiseThe 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, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9530684
Systemic Inflammatory Response Syndrome, Pneumonia, Malaise, Treatment Failure
This Systemic Inflammatory Response Syndrome side effect was reported by a consumer or non-health professional from GB. A 71-year-old female patient (weight:NA) experienced the following symptoms/conditions: lower respiratory tract infection.The patient was prescribed Cefalexin (drug dosage: NA), which was initiated on 201302. Concurrently used drugs: NA..After starting to take Cefalexin the consumer reported adverse symptoms, such as: Systemic Inflammatory Response Syndrome, Pneumonia, Malaise, Treatment FailureThese side effects may potentially be related to Cefalexin. The patient was hospitalized.
Cefalexin Side Effect Report#9512140
Treatment Failure
This is a report of a 88-year-old male patient (weight: NA) from GB, suffering from the following health symptoms/conditions: lower respiratory tract infection, who was treated with Cefalexin (cefalexin) (dosage: 1000 Mg (250 Mg, 4 In 1 D), Oral, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Treatment Failure after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin (cefalexin) treatment in male patients, resulting in Treatment Failure side effect. The patient was hospitalized.
Cefalexin Side Effect Report#9506998
Treatment Failure
This report suggests a potential Cefalexin Treatment Failure side effect(s) that can have serious consequences. A 88-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: lower respiratory tract infection and used Cefalexin (dosage: 250 Mg, Qid) starting NS. After starting Cefalexin the patient began experiencing various side effects, including: Treatment FailureAdditional drugs used concurrently: NA.The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Treatment Failure, may still occur.
Cefalexin Side Effect Report#9506995
Headache, Confusional State, Agitation, Lethargy, Dizziness, Somnolence, Pneumonia, Meningitis, Encephalitis
This Headache problem was reported by a health professional from GB. A 80-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection. On
Jul 25, 2013 this consumer started treatment with Cefalexin (cefalexin) (dosage: 1000 Mg (500 Mg,2 In 1 D)). The following drugs were being taken at the same time:
  • Bisoprolol (bisoprolol)
  • Warfarin (warfarin)
When using Cefalexin (cefalexin), the patient experienced the following unwanted symptoms/side effects: Headache, Confusional State, Agitation, Lethargy, Dizziness, Somnolence, Pneumonia, Meningitis, EncephalitisThe 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 Headache, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9506442
Arthralgia, Arthralgia
This Arthralgia side effect was reported by a physician from GB. A 93-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Cefalexin (cefalexin) (drug dosage: NA), which was initiated on
Aug 09, 2013. Concurrently used drugs:
  • Aspirin (acetylsalicylic Acid)
  • Betamethasone Valerate (betamethasone Valerate)
  • Bisoprolol (bisoprolol)
  • Clopidogrel (clopidogrel)
  • Co-codamol (panadeine Co)
  • Doublebase (hydromol/00906601/)
  • Furosemide (furosemide)
  • Losartan (losartan)
.After starting to take Cefalexin (cefalexin) the consumer reported adverse symptoms, such as: Arthralgia, ArthralgiaThese side effects may potentially be related to Cefalexin (cefalexin).
Cefalexin Side Effect Report#9503458
Pain, Arthralgia, Joint Stiffness
This is a report of a 93-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: NA, who was treated with Cefalexin (dosage: Unk, start time:
May 16, 2013), combined with:
  • Angeze/monomax Sr (Unk)
  • Aspirin (Unk)
  • Betamethasone Valerate (Unk)
  • Bisoprolol (Unk)
  • Clopidogrel (Unk)
  • Co-codamol (Unk)
  • Doublebase (Unk)
  • Furosemide (Unk)
and developed a serious reaction and side effect(s): Pain, Arthralgia, Joint Stiffness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin treatment in female patients, resulting in Pain side effect.
Cefalexin Side Effect Report#9502805
Agitation, Confusional State, Dizziness, Somnolence, Headache, Lethargy, Nervous System Disorder, Pneumonia, Syncope
This report suggests a potential Cefalexin Agitation side effect(s) that can have serious consequences. A 80-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: urinary tract infection and used Cefalexin (dosage: 500 Mg, Bid) starting
Jul 25, 2013. After starting Cefalexin the patient began experiencing various side effects, including: Agitation, Confusional State, Dizziness, Somnolence, Headache, Lethargy, Nervous System Disorder, Pneumonia, SyncopeAdditional drugs used concurrently:
  • Bisoprolol (2.5 Mg, Qd)
  • Warfarin
The patient was hospitalized. Although Cefalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Agitation, may still occur.
Cefalexin Side Effect Report#9493980
Pneumonia, Nervous System Disorder, Headache, Confusional State, Agitation, Lethargy, Dizziness, Somnolence
This Death problem was reported by a consumer or non-health professional from GB. A 80-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection,atrial fibrillation. On
Jul 25, 2013 this consumer started treatment with Cefalexin (dosage: NA). The following drugs were being taken at the same time:
  • Warfarin
  • Bisoprolol
When using Cefalexin, the patient experienced the following unwanted symptoms/side effects: Pneumonia, Nervous System Disorder, Headache, Confusional State, Agitation, Lethargy, Dizziness, SomnolenceThe 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 Death, may become evident only after a product is in use by the general population.
Cefalexin Side Effect Report#9441455
Myalgia, Muscle Spasms, Spinal Pain, Neck Pain, Gait Disturbance, Palpitations, Sinus Bradycardia, Blood Creatine Phosphokinase Increased, Vision Blurred
This Myalgia side effect was reported by a health professional from CA. A 56-year-old female patient (weight:NA) experienced the following symptoms/conditions: infection prophylaxis.The patient was prescribed Cefalexin (drug dosage: NA), which was initiated on
Jul 30, 2013. Concurrently used drugs:
  • Homeopathic/herbal Supplement
  • Aspirin
.After starting to take Cefalexin the consumer reported adverse symptoms, such as: Myalgia, Muscle Spasms, Spinal Pain, Neck Pain, Gait Disturbance, Palpitations, Sinus Bradycardia, Blood Creatine Phosphokinase Increased, Vision BlurredThese side effects may potentially be related to Cefalexin. The patient was hospitalized.
Cefalexin Side Effect Report#9413379
Pruritus, Face Oedema
This is a report of a 17-year-old male patient (weight: NA) from MX, suffering from the following health symptoms/conditions: NA, who was treated with Cefalexin (cefalexin) (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Pruritus, Face Oedema after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cefalexin (cefalexin) treatment in male patients, resulting in Pruritus side effect.


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The appearance of Cefalexin 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 Cefalexin Side Effects for Women?

Women Side EffectsReports
Pneumonia 8
Treatment Failure 7
Arthralgia 5
Erythema 4
Headache 4
Malaise 4
Rash 4
Somnolence 4
Agitation 3
Confusional State 3

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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.

    Cefalexin 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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