Allopurinol Side Effects by Likelihood and Severity

COMMON side effects


If experienced, these tend to have a Severe expression

  • Hives
  • Inflammation Of The Skin Due To An Allergy
  • Itching

INFREQUENT side effects


If experienced, these tend to have a Severe expression

  • A Skin Rash
  • Abnormal Liver Function Tests

If experienced, these tend to have a Less Severe expression

  • Nausea
  • Vomiting

RARE side effects


If experienced, these tend to have a Severe expression

  • A Blockage Of The Bile Duct That Resulting In High Bilirubin Levels
  • A Condition With Loosening Of The Nails From The Nailbed Called Onycholysis
  • A Hypersensitivity Reaction To A Drug
  • A Painful Condition That Affects The Nerves In The Legs And Arms Called Peripheral Neuropathy
  • A Skin Disorder With Blistering And Peeling Skin Called Stevens-Johnson Syndrome
  • A Skin Disorder With Blistering And Peeling Skin Called Toxic Epidermal Necrolysis
  • A Type Of Blood Disorder Where The Red Blood Cells Burst Called Hemolytic Anemia
  • A Type Of Blood Disorder With A Decrease In All Types Of Blood Cells Called Pancytopenia
  • A Type Of Significant Allergic Skin Reaction Called DRESS Syndrome
  • A Yellowing Of The Eyes Or Skin From Buildup Of Bilirubin Called Jaundice
  • Acute Inflammation Of The Pancreas
  • Anemia
  • Apnea, A Breathing Interruption
  • Bleeding Of The Stomach Or Intestines
  • Bronchospastic Lung Disease
  • Clouding Of The Lens Of The Eye Called Cataracts
  • Damage To The Liver And Inflammation
  • Decreased Blood Platelets
  • Decreased Function Of Bone Marrow
  • Decreased Kidney Function
  • Erythema Multiforme, A Type Of Allergic Skin Reaction
  • High Amount Of Calcium In The Blood
  • Increased Lymphocyte Cells In The Blood
  • Inflammation Of The Blood Vessels
  • Inflammation Of The Covering Of The Heart Or Pericardium
  • Kidney Failure
  • Kidney Inflammation
  • Kidney Stones
  • Large Purple Or Brown Skin Blotches
  • Liver Tissue Death
  • Low Blood Counts Due To Bone Marrow Failure
  • Lung Failure Causing Loss Of Breath
  • Nosebleed
  • Skin Rash With Sloughing
  • Slow Heartbeat
  • Sudden Blindness And Pain Upon Moving The Eye
  • Swollen Lymph Nodes
  • Very Low Levels Of Granulocytes, A Type Of White Blood Cell

If experienced, these tend to have a Less Severe expression

  • A Disease With Shrinking And Weaker Muscles Called Myopathy
  • A Feeling Of Pins And Needles On Skin
  • A Stuffy And Runny Nose
  • A Type Of Stomach Irritation Called Gastritis
  • Altered Interest In Having Sexual Intercourse
  • Asthma
  • Bloody Urine
  • Bruising Under The Skin
  • Confusion
  • Decreased Appetite
  • Decreased Tone Or Tension In A Part Of The Body
  • Depression
  • Diarrhea
  • Difficulty Sleeping
  • Dizziness
  • Drowsiness
  • Elevation Of Proteins In The Urine
  • Enlarged Breasts
  • Excessive Sweating
  • Fever
  • Furunculosis Or Boils On The Skin
  • Generalized Weakness
  • Hair Loss
  • Headache
  • High Levels Of White Blood Cells
  • Increased Eosinophils In The Blood
  • Indigestion
  • Inflammation Of The Iris - The Colored Part Of The Eyeball
  • Inflammation Of The Salivary Glands
  • Joint Pain
  • Low Levels Of White Blood Cells
  • Male Infertility
  • Memory Loss
  • Muscle Pain
  • Pink Eye
  • Puffy Face From Water Retention
  • Rapid Breathing
  • Ringing In The Ears
  • Sensation Of Spinning Or Whirling
  • Skin Disease Characterized By Swollen Itching Lesions
  • Stomach Cramps
  • Stomatitis, A Condition With Painful Swelling And Sores Inside The Mouth
  • Taste Impairment
  • The Inability To Have An Erection
  • Throat Irritation
  • Thrombophlebitis, An Inflamed Vein Due To A Blood Clot
  • Toxic Amblyopia, A Loss Of Vision
  • Visible Water Retention
  • Widening Of Blood Vessels

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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.