Hi, A metallic taste in the mouth can be caused by a variety of factors, including certain medications, infections, and medical conditions. In some cases, it may be related to menopause or hormonal changes. In your case, since you have a history of ovarian cancer and recently completed treatment, it is important to discuss this symptom with your healthcare provider to rule out any potential recurrence or complications related to your treatment. While omeprazole is typically used to treat gastroesophageal reflux disease (GERD), it may not be effective for everyone, and it is possible that your metallic taste is not related to GERD. Your healthcare provider may recommend additional testing or evaluation to determine the underlying cause of your symptoms. In addition, there are several things you can do at home to help alleviate a metallic taste in your mouth, such as practicing good oral hygiene, using a mouthwash or salt water rinse, and avoiding acidic or spicy foods. Drinking plenty of water and staying hydrated may also help to alleviate this symptom. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician