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Cephalexin Side Effects

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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.

Cephalexin Side Effects Reported to FDA



Cephalexin Side Effect Report#9971776
Tendonitis
This is a report of a 42-year-old male patient (weight: NA) from US, suffering from the following health 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): Tendonitis 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.
Cephalexin Side Effect Report#9931917
Pruritus, Pruritus, Rash Macular, Erythema, Eye Swelling, Dyspnoea, Swelling Face
This report suggests a potential Cephalexin Pruritus 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. After starting Cephalexin the patient began experiencing various side effects, including: Pruritus, Pruritus, Rash Macular, Erythema, Eye Swelling, Dyspnoea, Swelling FaceAdditional drugs used concurrently: NA. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pruritus, may still occur.
Cephalexin Side Effect Report#9880364
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 using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Skin DiscolourationAlthough 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.
Cephalexin Side Effect Report#9858362
Accidental Exposure To Product
This Accidental Exposure To Product side effect was reported by a consumer or non-health professional from Country Not Specified. A 29-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Cephalexin (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Imipramine
  • Imipramine
  • Imipramine
  • Imipramine
  • Risperidone
  • Lisdexamfetamine
  • Acetaminophen
.After starting to take Cephalexin the consumer reported adverse symptoms, such as: Accidental Exposure To ProductThese side effects may potentially be related to Cephalexin. The patient was hospitalized.
Cephalexin Side Effect Report#9851765
Polymyalgia Rheumatica, Psoriasis
This is a report of a 77-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: rash, who was treated with Cephalexin Capsules Usp 500mg (dosage: 4 Df, Daily, start time:
Nov 29, 2013), combined with:
  • Crestor
  • Ramipril
and developed a serious reaction and side effect(s): Polymyalgia Rheumatica, Psoriasis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin Capsules Usp 500mg treatment in male patients, resulting in Polymyalgia Rheumatica side effect.
Cephalexin Side Effect Report#9839551
Weight Decreased, Dysgeusia, Dizziness
This report suggests a potential Cephalexin Weight Decreased side effect(s) that can have serious consequences. A 76-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: sinusitis,vitamin supplementation and used Cephalexin (dosage: NA) starting 201312. After starting Cephalexin the patient began experiencing various side effects, including: Weight Decreased, Dysgeusia, DizzinessAdditional drugs used concurrently:
  • Multivitamins
Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Weight Decreased, may still occur.
Cephalexin Side Effect Report#9803691
Clostridium Difficile Colitis, Gastrointestinal Stoma Output Increased, Disease Recurrence
This Clostridium Difficile Colitis problem was reported by a pharmacist from US. A 59-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection. On
Nov 01, 2013 this consumer started treatment with Cephalexin (dosage: NA). The following drugs were being taken at the same time:
  • Ertapenem
When using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Clostridium Difficile Colitis, Gastrointestinal Stoma Output Increased, Disease RecurrenceThe 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 Colitis, may become evident only after a product is in use by the general population.
Cephalexin Side Effect Report#9803098
Fatigue, Asthenia, Paraesthesia, Hypoaesthesia, Pruritus, Nausea, Syncope, Muscular Weakness, Vulvovaginal Discomfort
This Fatigue side effect was reported by a consumer or non-health professional from US. A 29-year-old female patient (weight:NA) experienced the following symptoms/conditions: pharyngitis streptococcal.The patient was prescribed Cephalexin (drug dosage: One Capsule Twice Daily Taken By Mouth), which was initiated on NS. Concurrently used drugs: NA..After starting to take Cephalexin the consumer reported adverse symptoms, such as: Fatigue, Asthenia, Paraesthesia, Hypoaesthesia, Pruritus, Nausea, Syncope, Muscular Weakness, Vulvovaginal DiscomfortThese side effects may potentially be related to Cephalexin.
Cephalexin Side Effect Report#9797526
Pruritus
This is a report of a 27-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: sinusitis, who was treated with Cephalexin (dosage: NA, start time:
Dec 23, 2013), combined with: NA. and developed a serious reaction and side effect(s): Pruritus after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in female patients, resulting in Pruritus side effect.
Cephalexin Side Effect Report#9778555
Asthenia, Cholestasis, Cholangitis
This report suggests a potential Cephalexin Asthenia side effect(s) that can have serious consequences. A 74-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Cephalexin (dosage: NA) starting
Nov 04, 2013. After starting Cephalexin the patient began experiencing various side effects, including: Asthenia, Cholestasis, CholangitisAdditional drugs used concurrently: NA.The patient was hospitalized. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Asthenia, may still occur.
Cephalexin Side Effect Report#9747701
Diarrhoea, Abdominal Pain Upper, Flatulence, Abdominal Distension, Pyrexia
This Diarrhoea problem was reported by a consumer or non-health professional from US. A 29-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: urinary tract infection. On
Nov 13, 2013 this consumer started treatment with Cephalexin (dosage: 20 Twice Daily, Taken By Mouth). The following drugs were being taken at the same time: NA. When using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Diarrhoea, Abdominal Pain Upper, Flatulence, Abdominal Distension, PyrexiaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Diarrhoea, may become evident only after a product is in use by the general population.
Cephalexin Side Effect Report#9735613
Cardio-respiratory Arrest
This Cardio-respiratory Arrest side effect was reported by a consumer or non-health professional from US. A 40-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Cephalexin (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Quetiapine
  • Oxycodone (oxycodone)
  • Paroxetine (paroxetine)
.After starting to take Cephalexin the consumer reported adverse symptoms, such as: Cardio-respiratory ArrestThese side effects may potentially be related to Cephalexin.
Cephalexin Side Effect Report#9733544
Renal Failure Acute, Tubulointerstitial Nephritis, Haemodialysis, Hypersensitivity, Somnolence
This is a report of a 2-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: urinary tract infection, who was treated with Cephalexin (dosage: NA, start time:
Nov 22, 2013), combined with: NA. and developed a serious reaction and side effect(s): Renal Failure Acute, Tubulointerstitial Nephritis, Haemodialysis, Hypersensitivity, Somnolence after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in male patients, resulting in Renal Failure Acute side effect. The patient was hospitalized and became disabled.
Cephalexin Side Effect Report#9731773
Completed Suicide
This report suggests a potential Cephalexin Completed Suicide side effect(s) that can have serious consequences. A 23-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Cephalexin (dosage: NA) starting NS. After starting Cephalexin the patient began experiencing various side effects, including: Completed SuicideAdditional drugs used concurrently:
  • Benztropine
Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Completed Suicide, may still occur.
Cephalexin Side Effect Report#9695649
Muscle Spasms
This Muscle Spasms problem was reported by a consumer or non-health professional from US. A 54-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: arthritis infective. On
Nov 12, 2013 this consumer started treatment with Cephalexin (dosage: 1 Pill Per 8 Hours?three Times Daily ?taken By Mouth). The following drugs were being taken at the same time: NA. When using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Muscle SpasmsAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Muscle Spasms, may become evident only after a product is in use by the general population.
Cephalexin Side Effect Report#9665641
Dizziness, Angioedema
This Dizziness side effect was reported by a pharmacist from US. A 40-year-old male patient (weight:NA) experienced the following symptoms/conditions: cellulitis.The patient was prescribed Cephalexin (drug dosage: NA), which was initiated on
Sep 12, 2013. Concurrently used drugs: NA..After starting to take Cephalexin the consumer reported adverse symptoms, such as: Dizziness, AngioedemaThese side effects may potentially be related to Cephalexin. The patient was hospitalized.
Cephalexin Side Effect Report#9664463
Clostridium Difficile Colitis, Pyrexia, Mental Status Changes, Decreased Appetite
This is a report of a male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Cephalexin (dosage: NA, start time:
Aug 01, 2013), combined with: NA. and developed a serious reaction and side effect(s): Clostridium Difficile Colitis, Pyrexia, Mental Status Changes, Decreased Appetite after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in male patients, resulting in Clostridium Difficile Colitis side effect. The patient was hospitalized.
Cephalexin Side Effect Report#9661161
This report suggests a potential Cephalexin Death side effect(s) that can have serious consequences. A 68-year-old patient (weight: NA) from US was diagnosed with the following symptoms/conditions: blister and used Cephalexin (dosage: NA) starting NS. After starting Cephalexin the patient began experiencing various side effects, including:Additional drugs used concurrently: NA. Although Cephalexin demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Death, may still occur.
Cephalexin Side Effect Report#9656059
Blister, Rash Maculo-papular, Pruritus, Scratch, Haemorrhage, Scab, Rash
This Blister problem was reported by a consumer or non-health professional from US. A 5-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: skin infection. On
Oct 21, 2013 this consumer started treatment with Cephalexin (dosage: NA). The following drugs were being taken at the same time: NA. When using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Blister, Rash Maculo-papular, Pruritus, Scratch, Haemorrhage, Scab, RashAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Blister, may become evident only after a product is in use by the general population.
Cephalexin Side Effect Report#9656005
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 (drug dosage: 250 Four Times Daily), which was initiated on NS. Concurrently used drugs: NA..After starting to take Cephalexin the consumer reported adverse symptoms, such as: Rash, Dry SkinThese side effects may potentially be related to Cephalexin.
Cephalexin Side Effect Report#9655974
Dyspepsia, Decreased Appetite, Nausea, Abdominal Pain Upper, Abdominal Pain Upper, Fatigue
This is a report of a 51-year-old male patient (weight: NA) from US, suffering from the following health 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): Dyspepsia, Decreased Appetite, Nausea, Abdominal Pain Upper, Abdominal Pain Upper, Fatigue 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.
Cephalexin Side Effect Report#9639796
Feeling Cold, Piloerection, Swelling, Infection, No Therapeutic Response
This report suggests a potential Cephalexin Feeling Cold 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. After starting Cephalexin the patient began experiencing various side effects, including: Feeling Cold, Piloerection, Swelling, Infection, No Therapeutic ResponseAdditional 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.
Cephalexin Side Effect Report#9630825
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 using Cephalexin, the patient experienced the following unwanted symptoms/side effects: Renal Failure AcuteThe 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.
Cephalexin Side Effect Report#9602174
Nervous System Disorder, Agitation, Confusional State, Dizziness, Somnolence, Headache, Lethargy, Pneumonia, Syncope
This Nervous System Disorder side effect was reported by a consumer or non-health professional from GB. A 80-year-old female patient (weight:NA) experienced the following symptoms/conditions: urinary tract infection.The patient was prescribed Cephalexin (drug dosage: 2.00 Timer Per 1.0days), which was initiated on
Jul 25, 2013. Concurrently used drugs:
  • Bisoprolol(bisoprolol)
  • Warfarin(warfarin)
.After starting to take Cephalexin the consumer reported adverse symptoms, such as: Nervous System Disorder, Agitation, Confusional State, Dizziness, Somnolence, Headache, Lethargy, Pneumonia, SyncopeThese side effects may potentially be related to Cephalexin. The patient was hospitalized.
Cephalexin Side Effect Report#9602171
Joint Stiffness, Pain, Arthralgia
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 Cephalexin (dosage: NA, start time:
Aug 09, 2013), combined with:
  • 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_
and developed a serious reaction and side effect(s): Joint Stiffness, Pain, Arthralgia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Cephalexin treatment in female patients, resulting in Joint Stiffness side effect.


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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.


What are common 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

What are common 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

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.

    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.

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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