Omeprazole Side Effects by Likelihood and Severity

COMMON side effects


If experienced, these tend to have a Less Severe expression

  • Diarrhea
  • Gas
  • Headache
  • Intense Abdominal Pain
  • Vomiting

INFREQUENT side effects


If experienced, these tend to have a Less Severe expression

  • A Common Cold
  • Backache
  • Chest Pain
  • Constipation
  • Cough
  • Dizziness
  • Fever
  • Generalized Weakness
  • Itching
  • Nausea

RARE side effects


If experienced, these tend to have a Severe expression

  • A Broken Bone
  • A Fungal Infection In The Esophagus Due To Candida
  • A High Alanine Transaminase Level
  • A High Aspartate Transaminase Level
  • A Significant Type Of Allergic Reaction Called Anaphylaxis
  • 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 Sudden Vision Loss Due To Loss Of The Blood Supply To The Front Of The Optic Nerve
  • A Type Of Allergic Reaction Called Angioedema
  • A Type Of Blood Disorder With A Decrease In All Types Of Blood Cells Called Pancytopenia
  • A Type Of Kidney Inflammation Called Interstitial Nephritis
  • Abnormal Heart Rhythm
  • Abnormal Liver Function Tests
  • Anemia
  • Bloody Urine
  • Bronchospasm
  • Decreased Blood Platelets
  • Diarrhea From An Infection With Clostridium Difficile Bacteria
  • Elevation Of Proteins In The Urine
  • Erythema Multiforme, A Type Of Allergic Skin Reaction
  • High Amount Of Bilirubin In The Blood
  • High Blood Pressure
  • High Levels Of White Blood Cells
  • Hives
  • Inflammation Of The Liver Called Hepatitis
  • Inflammation Of The Liver With Stoppage Of Bile Flow
  • Inflammation Of The Stomach Called Atrophic Gastritis
  • Liver Failure
  • Low Amount Of Sodium In The Blood
  • Low Blood Sugar
  • Low Levels Of A Type Of White Blood Cell Called Neutrophils
  • Low Levels Of White Blood Cells
  • Pancreatitis
  • Slow Heartbeat
  • Subacute Cutaneous Lupus Erythematosus
  • Sudden Blindness And Pain Upon Moving The Eye
  • Systemic Lupus Erythematosus, An Autoimmune Disease
  • Very Low Levels Of Granulocytes, A Type Of White Blood Cell

If experienced, these tend to have a Less Severe expression

  • A Condition Where There Is Excess Sugar In The Urine
  • A Feeling Of General Discomfort Called Malaise
  • A Feeling Of Pins And Needles On Skin
  • A Skin Rash
  • A Sleep Disorder
  • A Sore Throat
  • An Abnormal Stool Color
  • Blurred Vision
  • Cramps
  • Decreased Appetite
  • Double Vision
  • Dry Eye
  • Dry Mouth
  • Dry Skin
  • Enlarged Breasts
  • Excessive Sweating
  • Eye Irritation
  • Fast Heartbeat
  • Fluid Retention In The Legs, Feet, Arms Or Hands
  • Hair Loss
  • Heart Throbbing Or Pounding
  • Inadequate Vitamin B12
  • Increased Sensitivity Of The Skin To The Sun
  • Irritable Colon
  • Joint Pain
  • Large Purple Or Brown Skin Blotches
  • Leg Pain
  • Low Amount Of Magnesium In The Blood
  • Low Energy
  • Muscle Pain
  • Muscle Tremors
  • Muscle Weakness
  • Non-Cancerous Growths In The Stomach Called Benign Fundic Gland Polyposis
  • Nosebleed
  • Pain
  • Pain In The Testicles
  • Ringing In The Ears
  • Sensation Of Spinning Or Whirling
  • Skin Inflammation
  • Small Reddish-Purplish Pin-Point Sized Spots On Skin
  • Stomatitis, A Condition With Painful Swelling And Sores Inside The Mouth
  • Swelling Of The Abdomen
  • Taste Impairment
  • Urinary Tract Infection
  • Weight Gain

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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.