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Cephalexin Side Effects

Common Cephalexin Side Effects


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

Rash (54)
Pruritus (52)
Diarrhoea (49)
Urticaria (45)
Vomiting (43)
Pain (41)
Dyspnoea (40)
Nausea (40)
Dizziness (34)
Pyrexia (28)
Headache (28)
Deep Vein Thrombosis (26)
Abdominal Pain (26)
International Normalised Ratio Increased (23)
Malaise (22)
Abdominal Pain Upper (22)
Renal Failure Acute (20)
Fatigue (19)
Anaphylactic Reaction (18)
Anxiety (18)

➢ 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.

Cephalexin Side Effects Reported to FDA

The following Cephalexin 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 Cephalexin 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.
Tendonitis
This is a report of a 42-year-old male patient (weight: NA) from US, suffering from the following symptoms/conditions: pharyngitis streptococcal, who was treated with Cephalexin (dosage: One Capsule, Three Times Daily, Taken By Mouth, start time: Feb 19, 2014), combined with: NA. and developed a serious reaction and side effect(s). The consumer presented with:
  • Tendonitis
which developed after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in male patients, resulting in tendonitis side effect.

Pruritus, Rash Macular, Erythema, Eye Swelling, Dyspnoea, Swelling Face
This report suggests a potential Cephalexin Pruritus, Rash Macular, Erythema, Eye Swelling, Dyspnoea, Swelling Face side effect(s) that can have serious consequences. A 62-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: arthritis,limb operation and used Cephalexin (dosage: NA) starting Feb 06, 2014. Soon after starting Cephalexin the patient began experiencing various side effects, including:
  • Pruritus
  • Rash Macular
  • Erythema
  • Eye Swelling
  • Dyspnoea
  • Swelling Face
Drugs used concurrently: NA. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as pruritus, may still occur.

Skin Discolouration
This Skin Discolouration problem was reported by a consumer or non-health professional from US. A 82-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: limb operation. On Sep 10, 2013 this consumer started treatment with Cephalexin (dosage: NA). The following drugs were being taken at the same time:
  • Atenolol
  • Amlodipine Besilate
  • Pradaxa
  • Multiple Vitamin 1 A Day Women
  • Iron
  • Pot
  • Magnesium
  • B12 Shot
When commencing Cephalexin, the patient experienced the following unwanted symptoms/side effects:
  • Skin Discolouration
Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as skin discolouration, may become evident only after a product is in use by the general population.

Accidental Exposure To Product
This is a report of a 29-year-old female patient (weight: NA) from COUNTRY NOT SPECIFIED. The patient developed the following symptoms/conditions: NA and was treated with Cephalexin (dosage: NA) starting NS. Concurrently used drugs:
  • Imipramine
  • Imipramine
  • Imipramine
  • Imipramine
  • Risperidone
  • Lisdexamfetamine
  • Acetaminophen
Soon after that, the consumer experienced the following side effects:
  • Accidental Exposure To Product
The patient was hospitalized. This opens a possibility that Cephalexin treatment could cause the above reactions, including accidental exposure to product, and some female subjects may be more susceptible.


Polymyalgia Rheumatica, Psoriasis
A 77-year-old male patient (weight: NA) from US with the following symptoms/conditions: rash started Cephalexin Capsules Usp 500mg treatment (dosage: 4 Df, Daily) on Nov 29, 2013. Soon after starting Cephalexin Capsules Usp 500mg treatment, the subject experienced various side effects, including:
  • Polymyalgia Rheumatica
  • Psoriasis
Concurrently used drugs:
  • Crestor
  • Ramipril
This finding indicates that some male patients could be more vulnerable to Cephalexin Capsules Usp 500mg.

Weight Decreased, Dysgeusia, Dizziness
A 76-year-old male patient from US (weight: NA) experienced symptoms, such as: sinusitis,vitamin supplementation and was treated with Cephalexin(dosage: NA). The treatment was initiated on 201312. After that a consumer reported the following side effect(s):
  • Weight Decreased
  • Dysgeusia
  • Dizziness
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Cephalexin efficacy:
  • Multivitamins


Clostridium Difficile Colitis, Gastrointestinal Stoma Output Increased, Disease Recurrence
In this report, Cephalexin was administered for the following condition: urinary tract infection.A 59-year-old male consumer from US (weight: NA) started Cephalexin treatment (dosage: NA) on Nov 01, 2013.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Clostridium Difficile Colitis
  • Gastrointestinal Stoma Output Increased
  • Disease Recurrence
A possible interaction with other drugs could have contributed to this reaction:
  • Ertapenem
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 Cephalexin treatment could be related to the listed above side effect(s).

Fatigue, Asthenia, Paraesthesia, Hypoaesthesia, Pruritus, Nausea, Syncope, Muscular Weakness, Vulvovaginal Discomfort
This is a report of the following Cephalexin side effect(s):
  • Fatigue
  • Asthenia
  • Paraesthesia
  • Hypoaesthesia
  • Pruritus
  • Nausea
  • Syncope
  • Muscular Weakness
  • Vulvovaginal Discomfort
A 29-year-old female patient from US (weight: NA) presented with the following condition: pharyngitis streptococcal and received a treatment with Cephalexin (dosage: One Capsule Twice Daily Taken By Mouth) starting: NS.The following concurrently used drugs could have generated interactions: NA.This report suggests that a Cephalexin treatment could be associated with the listed above side effect(s).

Pruritus
This Cephalexin report was submitted by a 27-year-old female consumer from US (weight: NA). The patient was diagnosed with: sinusitis and Cephalexin was administered (dosage: NA) starting: Dec 23, 2013. The consumer developed a set of symptoms:
  • Pruritus
Other drugs used simultaneously: NA.Those unexpected symptoms could be linked to a Cephalexin treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Asthenia, Cholestasis, Cholangitis
This is a report of a possible correlation between Cephalexin use and the following symptoms/side effect(s):
  • Asthenia
  • Cholestasis
  • Cholangitis
which could contribute to an assessment of Cephalexin risk profile.A 74-year-old male consumer from US (weight: NA) was suffering from NA and was treated with Cephalexin (dosage: NA) starting Nov 04, 2013.Other concurrent medications: NA.The patient was hospitalized.

Diarrhoea, Abdominal Pain Upper, Flatulence, Abdominal Distension, Pyrexia
A 29-year-old female patient from US (weight: NA) presented with the following symptoms: urinary tract infection and after a treatment with Cephalexin (dosage: 20 Twice Daily, Taken By Mouth) experienced the following side effect(s):
  • Diarrhoea
  • Abdominal Pain Upper
  • Flatulence
  • Abdominal Distension
  • Pyrexia
The treatment was started on Nov 13, 2013. Cephalexin was used in combination with the following drugs: NA.This report could alert potential Cephalexin consumers.

Cardio-respiratory Arrest
In this report, a 40-year-old female patient from US (weight: NA) was affected by a possible Cephalexin side effect.The patient was diagnosed with NA. After a treatment with Cephalexin (dosage: NA, start date: NS), the patient experienced the following side effect(s):
  • Cardio-respiratory Arrest
The following simultaneously used drugs could have led to this reaction:
  • Quetiapine
  • Oxycodone (oxycodone)
  • Paroxetine (paroxetine)
The findings here stress that side effects should be taken into consideration when evaluating a Cephalexin treatment.

Renal Failure Acute, Tubulointerstitial Nephritis, Haemodialysis, Hypersensitivity, Somnolence
This is a report of a 2-year-old male patient from US (weight: NA), who used Cephalexin (dosage: NA) for a treatment of urinary tract infection. After starting a treatment on Nov 22, 2013, the patient experienced the following side effect(s):
  • Renal Failure Acute
  • Tubulointerstitial Nephritis
  • Haemodialysis
  • Hypersensitivity
  • Somnolence
The following drugs could possibly have interacted with the Cephalexin treatment NA.The patient was hospitalized and became disabled.Taken together, these observations suggest that a Cephalexin treatment could be related to side effect(s), such as Renal Failure Acute, Tubulointerstitial Nephritis, Haemodialysis, Hypersensitivity, Somnolence.

Completed Suicide
This completed suicide side effect was reported by a physician from US. A 23-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA. The patient was prescribed Cephalexin (dosage: NA), which was started on NS. Concurrently used drugs:
  • Benztropine
When starting to take Cephalexin the consumer reported the following symptoms:
  • Completed Suicide
These side effects may potentially be related to Cephalexin.

Muscle Spasms
This is a Cephalexin side effect report of a 54-year-old male patient (weight:NA) from US, suffering from the following symptoms/conditions: arthritis infective, who was treated with Cephalexin (dosage:1 Pill Per 8 Hours?three Times Daily ?taken By Mouth, start time: Nov 12, 2013), combined with: NA., and developed a serious reaction and a muscle spasms side effect. The patient presented with:
  • Muscle Spasms
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Cephalexin treatment in male patients suffering from arthritis infective, resulting in muscle spasms.

Dizziness, Angioedema
This report suggests a potential Cephalexin dizziness side effect(s) that can have serious consequences. A 40-year-old male patient from US (weight:NA) was diagnosed with the following health condition(s): cellulitis and used Cephalexin (dosage: NA) starting Sep 12, 2013. Soon after starting Cephalexin the patient began experiencing various side effects, including:
  • Dizziness
  • Angioedema
Drugs used concurrently:NA. The patient was hospitalized. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as dizziness, may still occur.

Clostridium Difficile Colitis, Pyrexia, Mental Status Changes, Decreased Appetite
This clostridium difficile colitis problem was reported by a pharmacist from US. A male patient (weight: NA) was diagnosed with the following medical condition(s): NA.On Aug 01, 2013 a consumer started treatment with Cephalexin (dosage: NA). The following drugs/medications were being taken at the same time: NA. When commencing Cephalexin, the patient experienced the following unwanted symptoms /side effects:
  • Clostridium Difficile Colitis
  • Pyrexia
  • Mental Status Changes
  • Decreased Appetite
The patient was hospitalized. Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as clostridium difficile colitis, may become evident only after a product is in use by the general population.


This is a Cephalexin side effect report of a 68-year-old patient (weight: NA) from US. The patient developed the following symptoms/conditions: blister and was treated with Cephalexin (dosage: NA) starting NS. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
    This opens a possibility that Cephalexin could cause death and that some patients may be more susceptible.

    Blister, Rash Maculo-papular, Pruritus, Scratch, Haemorrhage, Scab
    A 5-year-old female patient (weight: NA) from US with the following symptoms: skin infection started Cephalexin treatment (dosage: NA) on Oct 21, 2013. Soon after starting Cephalexin treatment, the consumer experienced several side effects, including:
    • Blister
    • Rash Maculo-papular
    • Pruritus
    • Scratch
    • Haemorrhage
    • Scab
    . Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Cephalexin side effects, such as blister.

    Rash, Dry Skin
    This rash side effect was reported by a consumer or non-health professional from US. A 71-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Cephalexin (dosage: 250 Four Times Daily), which was started on NS. Concurrently used drugs: NA..When starting to take Cephalexin the consumer reported symptoms, such as:
    • Rash
    • Dry Skin
    These side effects may potentially be related to Cephalexin.

    Dyspepsia, Decreased Appetite, Nausea, Abdominal Pain Upper, Fatigue
    This is a report of a 51-year-old male patient (weight: NA) from US, suffering from the following symptoms/conditions: nephrolithiasis, who was treated with Cephalexin (dosage: 1 Capsule Twice Daily Taken By Mouth, start time: Jun 06, 2012), combined with: NA. and developed a serious reaction and side effect(s). The consumer presented with:
    • Dyspepsia
    • Decreased Appetite
    • Nausea
    • Abdominal Pain Upper
    • Fatigue
    which developed after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in male patients, resulting in dyspepsia side effect.

    Feeling Cold, Piloerection, Swelling, Infection, No Therapeutic Response
    This report suggests a potential Cephalexin Feeling Cold, Piloerection, Swelling, Infection, No Therapeutic Response side effect(s) that can have serious consequences. A 17-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: infection and used Cephalexin (dosage: 1 Capsule, Three Times Daily, Taken By Mouth) starting Sep 09, 2013. Soon after starting Cephalexin the patient began experiencing various side effects, including:
    • Feeling Cold
    • Piloerection
    • Swelling
    • Infection
    • No Therapeutic Response
    Drugs used concurrently: NA. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as feeling cold, may still occur.

    Renal Failure Acute
    This Renal Failure Acute problem was reported by a pharmacist from US. A 65-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection. On Sep 19, 2013 this consumer started treatment with Cephalexin (dosage: NA). The following drugs were being taken at the same time:
    • Ciprofloxacin
    When commencing Cephalexin, the patient experienced the following unwanted symptoms/side effects:
    • Renal Failure Acute
    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 renal failure acute, may become evident only after a product is in use by the general population.

    Nervous System Disorder, Agitation, Confusional State, Dizziness, Somnolence, Headache, Lethargy, Pneumonia, Syncope
    This is a report of a 80-year-old female patient (weight: NA) from GB. The patient developed the following symptoms/conditions: urinary tract infection and was treated with Cephalexin (dosage: 2.00 Timer Per 1.0days) starting Jul 25, 2013. Concurrently used drugs:
    • Bisoprolol(bisoprolol)
    • Warfarin(warfarin)
    Soon after that, the consumer experienced the following side effects:
    • Nervous System Disorder
    • Agitation
    • Confusional State
    • Dizziness
    • Somnolence
    • Headache
    • Lethargy
    • Pneumonia
    • Syncope
    The patient was hospitalized. This opens a possibility that Cephalexin treatment could cause the above reactions, including nervous system disorder, and some female subjects may be more susceptible.

    Joint Stiffness, Pain, Arthralgia
    A 93-year-old female patient (weight: NA) from GB with the following symptoms/conditions: NA started Cephalexin treatment (dosage: NA) on Aug 09, 2013. Soon after starting Cephalexin treatment, the subject experienced various side effects, including:
    • Joint Stiffness
    • Pain
    • Arthralgia
    Concurrently used drugs:
    • Aspirin(aspirin)
    • Losartan(losartan)
    • Bisoprolol(bisoprolol)
    • Clopidogrel(clopidogrel)
    • Omeprazole(omeprazole)
    • Angeze/monomaxsr(angeze/monomax Sr)trimethoprim(trimethoprim)
    • Betamethasone Valerate(bethamethasone Valerate)doublebase(doublebase)
    • Co-codamol(co-codamol_
    This finding indicates that some female patients could be more vulnerable to Cephalexin.

    1 of 26 



    Top 10 Cephalexin Side Effects for Women

    Women Side EffectsReports
    Pain 32
    Nausea 30
    Diarrhoea 28
    Dyspnoea 28
    Urticaria 27
    Deep Vein Thrombosis 25
    Pruritus 25
    Vomiting 25
    Rash 24
    International Normalised Ratio Increased 22

    Top 10 Cephalexin Side Effects for Men

    Men Side EffectsReports
    Rash 30
    Pruritus 27
    Diarrhoea 20
    Urticaria 18
    Vomiting 18
    Renal Failure Acute 17
    Dizziness 13
    Abdominal Pain Upper 12
    Angioedema 12
    Dyspnoea 12

    Keep Track of Side Effects

    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.


    Discuss Cephalexin Side Effects

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    How Effective is Cephalexin for You?

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    Cephalexin Safety Alerts, Active Ingredients, Usage Information

    NDC0093-2238
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameCephalexin
    NameCephalexin
    Dosage FormTABLET
    RouteORAL
    On market since19900930
    LabelerTeva Pharmaceuticals USA Inc
    Active Ingredient(s)CEPHALEXIN
    Strength(s)250
    Unit(s)mg/1
    Pharma ClassCephalosporin Antibacterial [EPC],Cephalosporins [Chemical/Ingredient]

    Cephalexin Dosage, Warnings, Usage.

    Side Effects reported to FDA: 650

    Cephalexin safety alerts: No

    Reported deaths: 47

    Reported hospitalizations: 297

    Latest Cephalexin clinical trials