What side effects may I notice from receiving Omeprazole?

Side effects that you should report to your care team as soon as possible:
-Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
-Kidney injury—decrease in the amount of urine, swelling of the ankles, hands, or feet
-Low magnesium level—muscle pain or cramps, unusual weakness, fatigue, fast or irregular heartbeat, tremors
-Low vitamin B12 level—pain, tingling, or numbness in the hands or feet, muscle weakness, dizziness, confusion, difficulty concentrating
-Rash on the cheeks or arms that gets worse in the sun
-Redness, blistering, peeling, or loosening of the skin, including inside the mouth
-Severe diarrhea, fever
-Unusual bleeding or bruising
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
-Gas
-Headache
-Nausea
-Stomach pain
-Vomiting

This list may not describe all possible side effects for Omeprazole. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.