This is an index of side effect / adverse reaction reports (a.k.a. adverse event reports) related to Keflex (Cephalexin) and submitted to the FDA during the sample period of about a year. The information is not vetted and should not be considered as verified clinical evidence.
Reports by Event Outcome
All Cases (95)
Death (1)
Life Threatening Events (3)
Reports by Reaction Type
Drug Hypersensitivity (41),
Rash (10),
Drug Ineffective (9),
Hypersensitivity (8),
Nausea (7),
Cellulitis (5),
Staphylococcal Infection (5),
Arthralgia (5),
Adverse Drug Reaction (4),
Urticaria (4),
Headache (4),
Intentional Drug Misuse (4)
Below are a few examples of reports where side effects / adverse reactions may be related to Keflex (Cephalexin). For a complete list or a specific selection of reports, please use the links above.
Possible Keflex side effects in 46 year old female
Reported by a health professional (non-physician/pharmacist) from United States on 2012-08-27
Patient: 46 year old female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Benadryl
Dosage: unk
Codeine Sulfate
Dosage: unk
Demerol
Dosage: unk
Keflex
Dosage: unk
Prevacid
Dosage: unk
Prilosec
Dosage: unk
Tobramycin
Dosage: unk
Possible Keflex side effects in 61 year old female
Reported by a physician from United States on 2012-08-24
Patient: 61 year old female, weighing 91.0 kg (200.2 pounds)
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Celebrex
Dosage: unk
Keflex
Dosage: unk
Possible Keflex side effects in 71 year old
Reported by a physician from United States on 2012-08-21
Patient: 71 year old
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Keflex side effects in 71 year old
Reported by a physician from United States on 2012-08-20
Patient: 71 year old
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Keflex side effects in 57 year old female
Reported by a physician from United States on 2012-08-06
Patient: 57 year old female
Reactions: Urticaria, Drug Hypersensitivity
Drug(s) suspected as cause:
Doxycycline Hyclate
Dosage: unk
Ilosone
Dosage: unk
Keflex
Dosage: unk
Vioxx
Dosage: unk
Possible Keflex side effects in 71 year old
Reported by a physician from United States on 2012-08-06
Patient: 71 year old
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-08-01
Patient: male, weighing 108.0 kg (237.6 pounds)
Reactions: Blood Creatine Phosphokinase Increased, Drug Ineffective, Joint Hyperextension, Urinary Tract Infection, Blood Triglycerides Increased, Prostatomegaly, Fall, Hepatic Enzyme Increased
Drug(s) suspected as cause:
Humira
Indication: Crohn's Disease
Start date: 2008-02-02
Keflex
Indication: Urinary Tract Infection
Start date: 2011-06-01
Trilipix
Indication: Dyslipidaemia
End date: 2011-01-01
Other drugs received by patient: Vitamin B-12; Bupropion Hydrochloride; Singulair; Calcium Citrate; Claritin; Asmanex Twisthaler; Proventil-HFA; Allopurinol; Lisinopril; Protonix; Aspirin; Vitamin D; Questran; Lovaza; Multi-Vitamins; Foradil; Tramadol Hydrochloride
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-07-25
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Abilify
Dosage: unk
Aspirin
Dosage: unk
Benadryl
Dosage: unk
Demerol
Dosage: unk
Keflex
Dosage: unk
Lisinopril
Dosage: unk
Morphine Sulfate
Dosage: unk
Ranitidine
Dosage: unk
Ropinirole
Dosage: unk
Seroquel
Dosage: unk
Tetracycline HCL
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-07-10
Patient: male
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Bactrim
Dosage: unk
Codeine Sulfate
Dosage: unk
Keflex
Dosage: unk
PEN-VEE K
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-07-09
Patient: female, weighing 127.0 kg (279.4 pounds)
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Bacitracin
Dosage: unk
Keflex
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-07-09
Patient: male
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Bactrim
Dosage: unk
Codeine Sulfate
Dosage: unk
Keflex
Dosage: unk
PEN-VEE K
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in
Reported by a physician from United States on 2012-07-06
Patient:
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Keflex
Dosage: unk
Septra
Dosage: unk
Zithromax
Dosage: unk
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-07-06
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Amoxapine
Indication: Product Used FOR Unknown Indication
AN Unknown Medication
Indication: Product Used FOR Unknown Indication
Augmentin '125'
Indication: Product Used FOR Unknown Indication
Benadryl
Indication: Product Used FOR Unknown Indication
Betamethasone
Indication: Product Used FOR Unknown Indication
Biaxin XL
Indication: Product Used FOR Unknown Indication
Ceftin
Indication: Product Used FOR Unknown Indication
Ciprofloxacin HCL
Indication: Product Used FOR Unknown Indication
Claritin
Indication: Product Used FOR Unknown Indication
Cleocin Hydrochloride
Indication: Product Used FOR Unknown Indication
Clindamycin
Indication: Product Used FOR Unknown Indication
Codeine Sulfate
Indication: Product Used FOR Unknown Indication
Darvocet
Indication: Product Used FOR Unknown Indication
Darvon
Indication: Product Used FOR Unknown Indication
Demadex
Indication: Product Used FOR Unknown Indication
Demerol
Indication: Product Used FOR Unknown Indication
Erythromycin
Indication: Product Used FOR Unknown Indication
Flexeril
Indication: Product Used FOR Unknown Indication
Floxin
Indication: Product Used FOR Unknown Indication
Fosamax
Indication: Product Used FOR Unknown Indication
Gantrisin
Indication: Product Used FOR Unknown Indication
Gentamicin
Indication: Product Used FOR Unknown Indication
Geocillin
Indication: Product Used FOR Unknown Indication
Hismanal
Indication: Product Used FOR Unknown Indication
Intravenous Pyelogram DYE
Indication: Product Used FOR Unknown Indication
Keflex
Indication: Product Used FOR Unknown Indication
Ketoconazole
Indication: Product Used FOR Unknown Indication
Ketoprofen
Indication: Product Used FOR Unknown Indication
Konsyl
Indication: Product Used FOR Unknown Indication
Levaquin
Indication: Product Used FOR Unknown Indication
Levsinex
Indication: Product Used FOR Unknown Indication
Lopid
Indication: Product Used FOR Unknown Indication
Macrobid
Indication: Product Used FOR Unknown Indication
Macrodantin
Indication: Product Used FOR Unknown Indication
Mandelamine
Indication: Product Used FOR Unknown Indication
Maxaquin
Indication: Product Used FOR Unknown Indication
Metronidazole
Indication: Product Used FOR Unknown Indication
Monistat
Monistat
Indication: Product Used FOR Unknown Indication
Negram Powder
Indication: Product Used FOR Unknown Indication
Nilstat
Indication: Product Used FOR Unknown Indication
Noroxin
Indication: Product Used FOR Unknown Indication
Norpramin
Indication: Product Used FOR Unknown Indication
Omniflox
Indication: Product Used FOR Unknown Indication
Orphenadrine Citrate
Indication: Product Used FOR Unknown Indication
Pentazocine Lactate
Indication: Product Used FOR Unknown Indication
Persantine
Indication: Product Used FOR Unknown Indication
Premarin
Indication: Product Used FOR Unknown Indication
Propantheline Bromide
Indication: Product Used FOR Unknown Indication
Quinolone
Indication: Product Used FOR Unknown Indication
Sinequan
Indication: Product Used FOR Unknown Indication
SLO-BID
Indication: Product Used FOR Unknown Indication
Sulfur
Indication: Product Used FOR Unknown Indication
Suprax
Indication: Product Used FOR Unknown Indication
TAO
Indication: Product Used FOR Unknown Indication
Tavist-D
Indication: Product Used FOR Unknown Indication
Tetracycline
Indication: Product Used FOR Unknown Indication
Theo-DUR
Indication: Product Used FOR Unknown Indication
Trimpex
Indication: Product Used FOR Unknown Indication
Urised
Indication: Product Used FOR Unknown Indication
Valium
Indication: Product Used FOR Unknown Indication
Possible Keflex side effects in
Reported by a physician from United States on 2012-07-05
Patient:
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Amoxicillin
Dosage: unk
Keflex
Dosage: unk
Potassium Penicillin G
Dosage: unk
Tetanus Antitoxin
Dosage: unk
Tetracycline Hydrochloride
Dosage: unk
Possible Keflex side effects in female
Reported by a physician from United States on 2012-07-03
Patient: female, weighing 54.4 kg (119.7 pounds)
Reactions: Hypersensitivity, Drug Hypersensitivity
Drug(s) suspected as cause:
Clindamycin HCL
Dosage: unk
Keflex
Dosage: unk
Potassium Penicillin G
Dosage: unk
Vancomycin Hychloride
Dosage: unk
Possible Keflex side effects in female
Reported by a physician from United States on 2012-07-03
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Aleve
Dosage: unk
Colchicine
Dosage: unk
Keflex
Dosage: unk
Minocin
Dosage: unk
Naproxen Sodium
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in 59 year old male
Reported by a consumer/non-health professional from United States on 2012-07-02
Patient: 59 year old male
Reactions: Blood Creatine Phosphokinase Increased, Drug Ineffective, Joint Hyperextension, Urinary Tract Infection, Blood Triglycerides Increased, Fall, Hepatic Enzyme Increased, Prostatomegaly
Drug(s) suspected as cause:
Humira
Indication: Crohn's Disease
Start date: 2009-03-01
Keflex
Indication: Urinary Tract Infection
Start date: 2011-06-01
Trilipix
Indication: Product Used FOR Unknown Indication
End date: 2011-01-01
Other drugs received by patient: Allopurinol; Questran; Bupropion Hydrochloride; Vitamin D; Asmanex Twisthaler; Foradil; Proventil-HFA; Lovaza; Vitamin B-12; Tramadol HCL; Aspirin; Singulair; Claritin; Multi-Vitamins; Calcium Citrate; Lisinopril; Protonix
Possible Keflex side effects in female
Reported by a physician from United States on 2012-06-26
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Ceclor
Dosage: unk
Keflex
Dosage: unk
Morphine Sulfate
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in female
Reported by a health professional (non-physician/pharmacist) from United States on 2012-06-25
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Keflex
Dosage: unk
Lyrica
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-06-22
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Augmentin '125'
Dosage: unk
Benadryl
Dosage: 2% spray
Butorphanol
Dosage: unk
Celebrex
Dosage: unk
Ciprofloxacin HCL
Dosage: unk
Clindamycin HCL
Dosage: unk
Cyproheptadine HCL
Dosage: unk
Dihydroergotamine Mesylate
Dosage: unk
Doxycycline Monohydrate
Dosage: unk
Frova
Dosage: unk
Keflex
Dosage: unk
Ketorolac Tromethamine
Dosage: unk
Lidocaine Hydrochloride
Dosage: unk
Lovenox
Dosage: unk
Lyrica
Dosage: unk
Naproxen
Dosage: unk
Prochlorperazine
Dosage: unk
Reglan
Dosage: unk
Scopolamine
Dosage: unk
Skelaxin
Dosage: unk
Talwin
Dosage: unk
Tramadol HCL
Dosage: unk
Valium
Dosage: unk
Zomig
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-06-21
Patient: male
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Bactrim
Dosage: unk
Codeine Sulfate
Dosage: unk
Keflex
Dosage: unk
PEN-VEE K
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-06-19
Patient: male
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Ambien
Dosage: unk
Keflex
Dosage: unk
Septra
Dosage: unk
Vicodin
Dosage: unk
Vioxx
Dosage: unk
Wellbutrin
Dosage: unk
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-06-14
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Keflex
Dosage: unk
Lyrica
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in
Reported by a consumer/non-health professional from United States on 2012-06-14
Patient:
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Keflex
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in 50 year old female
Reported by a consumer/non-health professional from United States on 2012-06-14
Patient: 50 year old female, weighing 61.2 kg (134.7 pounds)
Reactions: Abdominal Pain, Spinal Pain, Vomiting, Nausea, Headache, Burning Sensation, Arthralgia, Diarrhoea, Neck Pain, Feeling Abnormal, Pain in JAW
Drug(s) suspected as cause:
Keflex
Possible Keflex side effects in male
Reported by a physician from United States on 2012-06-08
Patient: male
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Allegra-D 12 Hour
Dosage: unk
Ceclor
Dosage: unk
Erythromycin
Dosage: unk
Keflex
Dosage: unk
Levaquin
Dosage: unk
Penicillin G Potassium
Dosage: unk
Septra DS
Dosage: unk
Toradol
Dosage: unk
Possible Keflex side effects in male
Reported by a physician from United States on 2012-06-06
Patient: male
Reactions: Bedridden, Product Substitution Issue, Product Quality Issue, Adverse Drug Reaction, Drug Hypersensitivity, Inadequate Analgesia, Intentional Drug Misuse, Joint Injury, Cardiac Disorder, Tremor, Staphylococcal Infection, Arthralgia, Viral Pericarditis, Unevaluable Event, Withdrawal Syndrome, Neuralgia
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Cephalexin
Indication: Product Used FOR Unknown Indication
Duragesic-100
Duragesic-100
Duragesic-100
Duragesic-100
Duragesic-100
Duragesic-100
Indication: Nerve Injury
Duragesic-100
Duragesic-100
Duragesic-100
Indication: Pain in Extremity
Duragesic-100
Duragesic-100
Keflex
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2008-01-01
End date: 2008-01-01
Other drugs received by patient: Simavastatin; Furosemide; Celebrex; Cymbalta; Warfarin Sodium; Metformin HCL; Lasix; Prevacid; Diltiazem; Unknown Medication; Topamax; Cartia XT; Baclofen; Topamax; Hydrocodone; Singulair; Glucosamine Sulfate; Lisinopril
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-05-29
Patient: female, weighing 65.8 kg (144.7 pounds)
Reactions: Weight Decreased, Cellulitis, Nausea, Laceration, Headache, Fibromyalgia, Oral Candidiasis, Impaired Healing, Basal Cell Carcinoma, Dizziness, Feeling Abnormal, Cough, Decreased Appetite, Infection
Drug(s) suspected as cause:
Keflex
Indication: Infection
Start date: 2012-04-11
Remicade
Indication: Rheumatoid Arthritis
Start date: 2007-01-01
End date: 2012-02-01
Other drugs received by patient: Methotrexate
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-05-25
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Ceclor
Dosage: unk
Keflex
Dosage: unk
Morphine Sulfate
Dosage: unk
Potassium Penicillin G
Dosage: unk
Possible Keflex side effects in female
Reported by a consumer/non-health professional from United States on 2012-05-24
Patient: female
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Bactrim
Dosage: unk
Codeine Sulfate
Dosage: unk
Ibuprofen
Dosage: unk
Keflex
Dosage: unk
Lipitor
Dosage: unk
Ultram
Dosage: unk
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