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Cephalexin Side Effects

Report Cephalexin Side Effects

If you experienced any harmful or unwanted effects of Cephalexin, please share your experience. This could help to raise awareness about Cephalexin side effects, identify uknown risks and inform health professionals and patients taking Cephalexin.

Examples: headache, dizziness


The most commonly reported Cephalexin side effects are:
WEIGHT GAIN (104 reports)
Dizziness (30 reports)
Racing Heart Beat (27 reports)
Abdominal Pain (25 reports)
Period (22 reports)
Diarrhea (20 reports)
Nausea (17 reports)
Pain (13 reports)
Late Menstrual Period (10 reports)

If you have experienced a side effect listed above, you can check a box to report it.


To view a complete list of submitted side effects, please follow the link Cephalexin side effects . You can also compare Cephalexin side effects or view FDA reports.

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).
The 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 identified a causal relationship between the drug and the listed risk.

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Pneumonia, Treatment Failure
on Oct 03, 2013 Female from GB , 86 years of age, was diagnosed with and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: pneumonia, treatment failure. Cephalexin dosage: N/A. Patient was hospitalized.

Treatment Failure, Neutrophilia
Patient was taking Cephalexin. Patient felt the following Cephalexin side effects: treatment failure, neutrophilia on Oct 03, 2013 from GB Additional patient health information: Female , 78 years of age, was diagnosed with and. Cephalexin dosage: N/A.
Multiple prescriptions taken:

Treatment Failure
Adverse event was reported on Oct 03, 2013 by a Male taking Cephalexin (Dosage: 25.00 Mg-4.00 Times Per 1.0 Days) was diagnosed with and. Location: GB , 88 years of age, After Cephalexin was administered, patient encountered several Cephalexin side effects: treatment failure. Patient was hospitalized.

Pneumonia, Systemic Inflammatory Response Syndrome, Malaise, Treatment Failure
on Oct 03, 2013 Female from GB , 71 years of age, was diagnosed with and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: pneumonia, systemic inflammatory response syndrome, malaise, treatment failure. Cephalexin dosage: 250.00 Mg-3.00 Times Per-1.0 Days.
Associated medications used: Patient was hospitalized.


Pneumonia, Treatment Failure, Lung Neoplasm Malignant
on Sep 26, 2013 Female from COUNTRY NOT SPECIFIED , 86 years of age, was diagnosed with and was treated with Cephalexin. Patient felt the following Cephalexin side effects: pneumonia, treatment failure, lung neoplasm malignant. Cephalexin dosage: N/A. Patient was hospitalized.

Treatment Failure, Chills, Cough, Hyperhidrosis
Patient was taking Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: treatment failure, chills, cough, hyperhidrosis on Sep 26, 2013 from COUNTRY NOT SPECIFIED Additional patient health information: Male , 89 years of age, was diagnosed with and. Cephalexin dosage: N/A.
Multiple concurrent drugs taken: Patient was hospitalized.

Diarrhoea, Weight Decreased, Vomiting
Adverse event was reported on Aug 16, 2013 by a Female taking Cephalexin (Dosage: 250 Mg, Tid + Oral) was diagnosed with and. Location: US , 43 years of age, weighting 140.0 lb, Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: diarrhoea, weight decreased, vomiting.
Associated medications used:

Dry Throat, Odynophagia, Hypersensitivity, Somnolence
on Aug 16, 2013 Female from US , 19 years of age, was diagnosed with and was treated with Cephalexin. Patient felt the following Cephalexin side effects: dry throat, odynophagia, hypersensitivity, somnolence. Cephalexin dosage: N/A.

Cough, Dyspnoea, Neutrophilia
on Sep 20, 2013 Female from COUNTRY NOT SPECIFIED , 78 years of age, was diagnosed with and was treated with Cephalexin (no Pref. Name) 500 Mg. After Cephalexin was administered, patient encountered several Cephalexin side effects: cough, dyspnoea, neutrophilia. Cephalexin (no Pref. Name) 500 Mg dosage: N/A.
Multiple concurrent drugs taken:
  • Alendronic Acid
  • Atorvastatin
  • Doxycycline
  • Nicorandil
  • Prednisolone
  • Steroids
  • Tamazepam
  • Aminophylline
Patient was hospitalized.

Hypersensitivity
Patient was taking Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: hypersensitivity on Sep 17, 2013 from US Additional patient health information: Female , 28 years of age, weighting 125.0 lb, was diagnosed with and. Cephalexin dosage: 500mg/1 Pill Twice Daily Taken By Mouth. Patient was hospitalized.

Abdominal Pain Upper, Arthritis, Arthropod Bite, Blood Creatinine Increased, Bronchitis, Bronchospasm, Cholelithiasis, Cough, Deep Vein Thrombosis
Adverse event was reported on Sep 18, 2013 by a Female taking Cephalexin (Dosage: N/A) . Location: US , 35 years of age, Patient felt the following Cephalexin side effects: abdominal pain upper, arthritis, arthropod bite, blood creatinine increased, bronchitis, bronchospasm, cholelithiasis, cough, deep vein thrombosis.
Multiple prescriptions taken:
  • Mupirocin
  • Oseltamivir (150 Mg, Qd)
  • Endal-hd
  • Triamcinolone Acetonide
  • Prilosec
  • Exgest La (2 U)
  • Mescolor (2 U)
  • Triazolam (.25 Mg, Qd)
Patient was hospitalized and became disabled.

Fatigue, Pain, Rash Erythematous, Eschar, Pyrexia
on Sep 17, 2013 Male from US , 57 years of age, was diagnosed with and was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: fatigue, pain, rash erythematous, eschar, pyrexia. Cephalexin dosage: N/A. Patient was hospitalized.

Gait Disturbance, Altered Visual Depth Perception, Erectile Dysfunction, Depression, Fungal Infection, Pruritus, Dyspnoea, Diarrhoea, Dizziness
on Mar 06, 2014 Male from US , 31 years of age, weighting 190.2 lb, was diagnosed with and was treated with Cephalexin Capsules 500 Mg. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: gait disturbance, altered visual depth perception, erectile dysfunction, depression, fungal infection, pruritus, dyspnoea, diarrhoea, dizziness. Cephalexin Capsules 500 Mg dosage: N/A.

Systemic Inflammatory Response Syndrome, Pneumonia
Patient was taking Cephalexin. Patient felt the following Cephalexin side effects: systemic inflammatory response syndrome, pneumonia on Sep 13, 2013 from US Additional patient health information: Female , 71 years of age, was diagnosed with and. Cephalexin dosage: N/A.
Multiple prescriptions taken: Patient was hospitalized.

Face Oedema, Headache, Nausea, Paraesthesia Oral
Adverse event was reported on Sep 13, 2013 by a Female taking Cephalexin (Dosage: N/A) was diagnosed with and. Location: COUNTRY NOT SPECIFIED , 27 years of age, weighting 229.3 lb, After Cephalexin was administered, patient encountered several Cephalexin side effects: face oedema, headache, nausea, paraesthesia oral. Patient was hospitalized.

Lethargy, Blood Pressure Inadequately Controlled, Feeling Abnormal
on Sep 10, 2013 Female from US , 66 years of age, was diagnosed with and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: lethargy, blood pressure inadequately controlled, feeling abnormal. Cephalexin dosage: N/A.
Associated medications used:
  • Tarka
  • Latanoprost
  • Pantoprazole
  • Depakote
  • Montelukast
  • Azelast


Headache, Agitation, Confusional State, Dizziness, Somnolence, Lethargy, Pneumonia, Nervous System Disorder, Csf Lymphocyte Count Abnormal
on Sep 06, 2013 Female from COUNTRY NOT SPECIFIED , 80 years of age, was diagnosed with and was treated with Cephalexin. Patient felt the following Cephalexin side effects: headache, agitation, confusional state, dizziness, somnolence, lethargy, pneumonia, nervous system disorder, csf lymphocyte count abnormal. Cephalexin dosage: N/A.
Multiple prescriptions taken: Patient was hospitalized.

Pain, Arthralgia, Joint Stiffness
Patient was taking Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: pain, arthralgia, joint stiffness on Sep 06, 2013 from COUNTRY NOT SPECIFIED Additional patient health information: Female , 93 years of age, weighting 116.8 lb, . Cephalexin dosage: N/A.
Multiple concurrent drugs taken:

Treatment Failure
Adverse event was reported on Sep 06, 2013 by a Male taking Cephalexin (Dosage: N/A) was diagnosed with and. Location: GB , 88 years of age, Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: treatment failure. Patient was hospitalized.

Nausea, Dizziness, Product Odour Abnormal
on Aug 27, 2013 Female from US , 57 years of age, was diagnosed with and was treated with Cephalexin. Patient felt the following Cephalexin side effects: nausea, dizziness, product odour abnormal. Cephalexin dosage: N/A.

Diarrhoea, Abdominal Pain, Clostridium Difficile Infection
on Aug 23, 2013 Male from US , 97 years of age, weighting 155.4 lb, was diagnosed with and was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: diarrhoea, abdominal pain, clostridium difficile infection. Cephalexin dosage: 500 Mg Qid Po. Patient was hospitalized.

Abdominal Wall Haematoma, Retroperitoneal Haematoma, Deep Vein Thrombosis, Ureteric Obstruction
Patient was taking Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: abdominal wall haematoma, retroperitoneal haematoma, deep vein thrombosis, ureteric obstruction on Aug 19, 2013 from US Additional patient health information: Female , 60 years of age, was diagnosed with and. Cephalexin dosage: N/A.
Associated medications used: Patient was hospitalized.

Colitis Ulcerative, Clostridium Difficile Infection
Adverse event was reported on Aug 06, 2013 by a Male taking Cephalexin (Dosage: N/A) . Location: US , 78 years of age, Patient felt the following Cephalexin side effects: colitis ulcerative, clostridium difficile infection.
Multiple prescriptions taken: Patient was hospitalized.

Musculoskeletal Stiffness
on Jul 30, 2013 Female from US , 98 years of age, weighting 135.0 lb, was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: musculoskeletal stiffness. Cephalexin dosage: N/A.

Rash, Skin Exfoliation, Pruritus, Blister
on Jul 26, 2013 Female from US , weighting 145.0 lb, was diagnosed with and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: rash, skin exfoliation, pruritus, blister. Cephalexin dosage: 1 Capsule.
Associated medications used:

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Record and Track Your Side Effects

It is very important to keep track of all side effects and discuss them with your doctor. If you think you may have a medical emergency, call your doctor or 911 immediately.

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Most drugs have a large list of nonsevere or mild adverse effects which do not rule out continued usage. These effects depend on individual sensitivity, and can include nausea, dizziness, diarrhea, malaise, vomiting, headache, dermatitis, dry mouth, etc. Check commonly reported side effects . These can be considered a form of pseudo-allergic reaction, as not all users experience these effects; many users experience none at all.

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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