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WEIGHT GAIN (101)
Dizziness (30)
Racing Heart Beat (26)
Abdominal Pain (25)
Period (22)
Diarrhea (20)
Nausea (17)
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Cephalexin Side Effects and Adverse Effects reported to US Food and Drug Administration (FDA)

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Showing 1-25 of 552 

Vein Disorder, Myalgia, Emotional Distress, Pain, Muscle Spasms, Anxiety, Deep Vein Thrombosis, Oedema Peripheral, Nausea (8316981-X)
on Apr 19, 2012 Female from UNITED STATES , 27 years of age, weighting 169.0 lb, was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: vein disorder, myalgia, emotional distress, pain, muscle spasms, anxiety, deep vein thrombosis, oedema peripheral, nausea. Cephalexin dosage: 500 Mg, Unk.
Associated medications used:
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Bentyl (10 Mg, Unk)
  • Ventolin (900 Unk, Unk)
  • Yasmin (Unk)
  • Xanax (0.25 Mg, Tid)
  • Calcium
  • Tylenol (caplet) (Unk Unk, Prn)
  • Yasmin (Unk)
Patient was hospitalized.

Encephalopathy, Cardiac Arrest, International Normalised Ratio Increased, Laceration, Torsade De Pointes, Skin Ulcer, Loss Of Consciousness, Malnutrition, Haemodynamic Instability (8274281-0)
Patient was taking Cephalexin. Patient felt the following Cephalexin side effects: encephalopathy, cardiac arrest, international normalised ratio increased, laceration, torsade de pointes, skin ulcer, loss of consciousness, malnutrition, haemodynamic instability on Apr 11, 2012 from UNITED STATES Additional patient health information: Male , 65 years of age, weighting 233.7 lb, . Cephalexin dosage: N/A.
Multiple prescriptions taken:
  • Dabigatran
Patient was hospitalized.

Psoriasis (8272982-1)
Adverse event was reported on Mar 30, 2012 by a Female taking Cephalexin (Dosage: N/A) . Location: UNITED STATES , weighting 160.5 lb, After Cephalexin was administered, patient encountered several Cephalexin side effects: psoriasis.
Multiple concurrent drugs taken:
  • Olopatadine
  • Prilocaine Hydrochloride
  • Fluocinolone Acetonide
  • Fexofenadine
  • Multi-vitamins
  • Desoximetasone
  • Mupirocin
  • Carbamide Peroxide


Diarrhoea, Nausea, Vomiting (8264707-0)
on Mar 26, 2012 Male from UNITED STATES , 58 years of age, was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: diarrhoea, nausea, vomiting. Cephalexin dosage: N/A. Patient was hospitalized.


Panniculitis, Maternal Exposure During Pregnancy, Alanine Aminotransferase Increased, Leukopenia, Premature Rupture Of Membranes, Microcytic Anaemia, Blood Lactate Dehydrogenase Increased, Subcutaneous Nodule, T-cell Lymphoma (8264192-9)
on Mar 20, 2012 Female from UNITED STATES , 31 years of age, was diagnosed with
  • t-cell lymphoma
and was treated with Cephalexin. Patient felt the following Cephalexin side effects: panniculitis, maternal exposure during pregnancy, alanine aminotransferase increased, leukopenia, premature rupture of membranes, microcytic anaemia, blood lactate dehydrogenase increased, subcutaneous nodule, t-cell lymphoma. Cephalexin dosage: Unk / Unk / Oral.
Multiple prescriptions taken:
  • Clindamycin (Unk / Unk / Oral)
  • Prednisone (1 Mg/kg/day / Unk / Oral)


Sensation Of Foreign Body, Rash (8258628-7)
Patient was taking Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: sensation of foreign body, rash on Mar 21, 2012 from UNITED KINGDOM Additional patient health information: Female , 63 years of age, weighting 141.1 lb, was diagnosed with
  • urinary tract infection
and. Cephalexin dosage: 500 Mg, Tid.

Diarrhoea, Dehydration, Abdominal Pain, Weight Decreased, Back Pain, Muscle Spasms, Vomiting (8250482-2)
Adverse event was reported on Apr 02, 2012 by a Male taking Cephalexin (Dosage: N/A) was diagnosed with
  • bronchitis
and. Location: UNITED STATES , 47 years of age, weighting 135.0 lb, Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: diarrhoea, dehydration, abdominal pain, weight decreased, back pain, muscle spasms, vomiting. Patient was hospitalized.

Pain, Gallbladder Disorder, Injury (8239395-X)
on Mar 19, 2012 Female from UNITED STATES , 19 years of age, weighting 99.98 lb, was treated with Cephalexin. Patient felt the following Cephalexin side effects: pain, gallbladder disorder, injury. Cephalexin dosage: Unk.
Multiple prescriptions taken:
  • Benzonatate (Unk)
  • Yasmin
  • Naproxen (500 Mg)
  • Omeprazole (Unk)
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Sertraline Hydrochloride (Unk)
  • Drospirenone And Ethinyl Estradiol
  • Dicyclomine (Unk)


Chills, Lymphadenopathy, Rash Macular, Dermatitis Exfoliative, Temperature Regulation Disorder, Skin Discolouration (8234086-3)
on Mar 26, 2012 Female from UNITED STATES , child 7 years of age, weighting 46.00 lb, was diagnosed with
  • skin infection
and was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: chills, lymphadenopathy, rash macular, dermatitis exfoliative, temperature regulation disorder, skin discolouration. Cephalexin dosage: 6 Mls.

Angioedema, Anaphylactic Reaction (8233320-3)
Patient was taking Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: angioedema, anaphylactic reaction on Mar 23, 2012 from UNITED STATES Additional patient health information: Male , 59 years of age, weighting 164.5 lb, was diagnosed with
  • upper respiratory tract infection
and. Cephalexin dosage: 500 Mg Qid Po.

Haematoma, Vision Blurred, Malaise, Arteritis, Headache, Paraesthesia, Pain In Extremity (8230374-5)
Adverse event was reported on Mar 06, 2012 by a Male taking Cephalexin (Dosage: N/A) . Location: MEXICO , 45 years of age, weighting 147.7 lb, Patient felt the following Cephalexin side effects: haematoma, vision blurred, malaise, arteritis, headache, paraesthesia, pain in extremity.
Multiple prescriptions taken:
  • Redevant (pitavastatin) (2 Mg;1x;po)


Rash (8224176-3)
on Mar 20, 2012 Male from UNITED STATES , 62 years of age, weighting 282.6 lb, was diagnosed with
  • cellulitis
and was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: rash. Cephalexin dosage: 500 Mg Qid Po.

Crohn's Disease, Cheilitis, Ingrowing Nail, Stress, Diarrhoea, Upper Respiratory Tract Infection, Colitis Ulcerative, Depression, Epistaxis (8210326-1)
on Mar 06, 2012 Male from UNITED STATES , weighting 315.3 lb, was diagnosed with
  • bronchitis
  • acne
and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: crohn's disease, cheilitis, ingrowing nail, stress, diarrhoea, upper respiratory tract infection, colitis ulcerative, depression, epistaxis. Cephalexin dosage: N/A.
Associated medications used:
  • Accutane


Cholelithiasis, Pain, Myocardial Infarction, Fear, Cerebrovascular Accident, Gallbladder Disorder, Injury, Pulmonary Embolism, Deep Vein Thrombosis (8209288-2)
Patient was taking Cephalexin. Patient felt the following Cephalexin side effects: cholelithiasis, pain, myocardial infarction, fear, cerebrovascular accident, gallbladder disorder, injury, pulmonary embolism, deep vein thrombosis on Mar 05, 2012 from UNITED STATES Additional patient health information: Female , 17 years of age, weighting 191.0 lb, . Cephalexin dosage: 500 Mg, Tid.
Multiple prescriptions taken:
  • Norgestimate And Ethinyl Estradiol (Unk)
  • Yaz (Unk)
  • Ibuprofen (Unk)
  • Promethazine Dm (Unk)
Patient was hospitalized.

Rash, Sensation Of Foreign Body (8206926-5)
Adverse event was reported on Mar 01, 2012 by a Female taking Cephalexin (Dosage: 500 Mg, Tid) was diagnosed with
  • urinary tract infection
and. Location: UNITED KINGDOM , 63 years of age, weighting 141.1 lb, After Cephalexin was administered, patient encountered several Cephalexin side effects: rash, sensation of foreign body.

Porphyria (8204095-9)
on Feb 29, 2012 Female from UNITED KINGDOM , 35 years of age, was diagnosed with
  • infection
and was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: porphyria. Cephalexin dosage: Unk.
Associated medications used:
  • Haem Arginate (Unk)
  • Amoxicillin (Unk)


Porphyria, Condition Aggravated (8201397-7)
on Feb 29, 2012 Female from , 35 years of age, was diagnosed with
  • infection
and was treated with Cephalexin. Patient felt the following Cephalexin side effects: porphyria, condition aggravated. Cephalexin dosage: Oral.
Multiple prescriptions taken:
  • Amoxicillin
  • Haem Arginate


Deep Vein Thrombosis, Pain, Abortion, Injury (8196456-1)
Patient was taking Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: deep vein thrombosis, pain, abortion, injury on Mar 02, 2012 from UNITED STATES Additional patient health information: Female , 27 years of age, weighting 178.0 lb, . Cephalexin dosage: N/A.
Multiple concurrent drugs taken:
  • Yasmin (Unk)
  • Iud Nos
  • Yaz (Unk)
  • Synthroid
  • Prednisone
  • Aciphex
  • Cefzil
  • Protonix


Pulmonary Embolism, Injury, Anxiety, Emotional Distress, Pain (8187398-6)
Adverse event was reported on Feb 27, 2012 by a Female taking Cephalexin (Dosage: Unk) . Location: UNITED STATES , 36 years of age, Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: pulmonary embolism, injury, anxiety, emotional distress, pain.
Associated medications used:
  • Lorazepam (Unk)
  • Hydroquinone (Unk)
  • Yasmin (Unk)
  • Yasmin
  • Clarithromycin (Unk)
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Drospirenone And Ethinyl Estradiol
  • Alprazolam (Unk)
Patient was hospitalized.

Device Kink, Device Breakage, Complication Of Device Removal (8187312-3)
on Feb 22, 2012 Female from UNITED KINGDOM , 34 years of age, weighting 189.6 lb, was treated with Cephalexin. Patient felt the following Cephalexin side effects: device kink, device breakage, complication of device removal. Cephalexin dosage: N/A.
Multiple prescriptions taken:
  • Lansoprazole
  • Implanon (Sc)
  • Penicillin V
  • Naproxen


Joint Injury, Spinal Osteoarthritis, Muscle Contractions Involuntary, Tardive Dyskinesia, Tremor, Economic Problem (8174210-4)
on Feb 13, 2012 Male from UNITED STATES , 50 years of age, was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: joint injury, spinal osteoarthritis, muscle contractions involuntary, tardive dyskinesia, tremor, economic problem. Cephalexin dosage: N/A.
Multiple concurrent drugs taken:
  • Crestor
  • Ery-tab
  • Protonix
  • Soma
  • Sulfamethoxazole And Trimethoprim
  • Triamterene And Hydrochlorothiazide
  • Valium
  • Zolpidem
Patient was hospitalized and became disabled.

Urinary Tract Infection, Pregnancy (8164479-4)
Patient was taking Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: urinary tract infection, pregnancy on Feb 17, 2012 from UNITED STATES Additional patient health information: Female , 33 years of age, . Cephalexin dosage: N/A.
Associated medications used:
  • Acetaminophen
  • Folic Acid/ferrous Fumarate
  • Tenofovir Disoproxil Fumarate
Patient was hospitalized.

Device Difficult To Use, Device Kink (8132254-2)
Adverse event was reported on Jan 30, 2012 by a Female taking Cephalexin (Dosage: N/A) . Location: UNITED KINGDOM , 34 years of age, weighting 189.6 lb, Patient felt the following Cephalexin side effects: device difficult to use, device kink.
Multiple prescriptions taken:
  • Naproxen
  • Implanon (Sc)
  • Lansoprazole
  • Penicillin V


Nausea, Vomiting, Diarrhoea (8131925-1)
on Jan 23, 2012 Male from UNITED STATES , 58 years of age, was treated with Cephalexin. After Cephalexin was administered, patient encountered several Cephalexin side effects: nausea, vomiting, diarrhoea. Cephalexin dosage: N/A. Patient was hospitalized.

Tardive Dyskinesia, Tooth Abscess, Tooth Fracture, Tremor, Emotional Distress, Upper Respiratory Tract Infection, Procedural Site Reaction, Device Occlusion, Posture Abnormal (8131745-8)
on Jan 24, 2012 Female from UNITED STATES , weighting 405.0 lb, was treated with Cephalexin. Directly after, patient experienced the unwanted or unexpected Cephalexin side effects: tardive dyskinesia, tooth abscess, tooth fracture, tremor, emotional distress, upper respiratory tract infection, procedural site reaction, device occlusion, posture abnormal. Cephalexin dosage: N/A.
Associated medications used:
  • Loperamide Hcl
  • Benadryl
  • Hydrocodone
  • Avapro
  • Guaifen Pse
  • Iron
  • Avandia
  • Actos
Patient was hospitalized.

Showing 1-25 of 552 

Cephalexin Health Episodes

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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.

Cephalexin Information

Alternative CEPHALEXIN Names:CEPHALEXI

Active Ingredient: CEPHALEXI

Cephalexin Dosage, Warnings, Usage.

Side Effects reported to FDA: 552. View Cephalexin Adverse Reports

Cephalexin safety alerts: No

Reported deaths: 31

Reported hospitalizations: 244

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