​Side effects of omeprazole include headache, stomach pain, diarrhea, nausea, vomiting  or passing gas.

• Please consult your healthcare professional if the symptoms do not go away or when any unexplained or unusual symptoms occur.

Consult your healthcare professional if you develop any blood in your stool (including blackened stool) or vomit.

The symptoms of a drug allergy include one or more of the following:

• Swollen face/eyes/lips/tongue
• Difficulty in breathing
• Itchy skin rashes over your whole body

Unusual symptoms such as muscle spasms (uncontrollable muscle movements), palpitations, dizziness and seizures may be a sign of low magnesium in the body.

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

​Inform your healthcare professional if:

• You are allergic to this medication or any of the other ingredients of this medication
• You are pregnant, planning to become pregnant, or breastfeeding
• You are taking any other medications, including supplements, traditional medications and herbal remedies.
• You experience weight loss for no reason or are vomiting food or blood as this medication may hide the symptoms of other diseases.
• You have watery or bloody stools that do not stop after a few days as this medication may increase your risk of diarrhoea caused by a type of bacteria called Clostridium difficile.
• You have osteoporosis, a condition where your bones become weak or fragile, as his medication may increase your risk of bone fractures.

​Inform your healthcare professional if you are taking or intend to take any other medication, supplements, traditional medications or herbal remedies.

This includes certain medications such as:

• Medications used to treat human immunodeficiency virus (HIV) infection.
• Blood thinners (e.g. warfarin, clopidogrel).
• Anti-fungal medications (e.g. ketoconazole).
• Drugs to treat mood (e.g. citalopram, imipramine and clomipramine).
• Seizures (e.g. phenytoin).
• Other medications such as digoxin, cyclosporin, methotrexate and iron salts.