Omeprazole

Prescription Uses

Prescription-strength omeprazole is used to treat several conditions related to the digestive system and acid production:

• Gastroesophageal reflux disease (GERD): A condition where stomach acid flows back into the esophagus, causing heartburn and potential injury.
• Erosive esophagitis: Healing and maintaining the healing of damage to the lining of the esophagus caused by stomach acid.
• Ulcers: Treatment of gastric (stomach) ulcers and duodenal ulcers (ulcers in the first part of the small intestine).
• Hypersecretory conditions: Rare conditions where the stomach produces too much acid, such as Zollinger-Ellison syndrome.
• H. pylori infections: Used in combination with antibiotics to treat and prevent the return of ulcers caused by the bacteria Helicobacter pylori.

Over-the-Counter (OTC) Uses

Non-prescription omeprazole is used to treat frequent heartburn that occurs two or more days per week. It is not intended for immediate relief of occasional heartburn symptoms, as it may take one to four days to reach its full effect.

Mechanism of Action

Omeprazole belongs to a class of medications known as proton pump inhibitors (PPIs). Its primary function is to lower the level of acid in the stomach by targeting the source of acid production.

The stomach lining contains specialized cells that use a mechanism called a proton pump to secrete acid. Omeprazole works by binding to these pumps and preventing them from releasing acid into the stomach. This process helps to:

• Relieve symptoms: It reduces the burning sensation of heartburn and acid reflux.
• Promote healing: It allows the lining of the esophagus to heal if it has been damaged by stomach acid.
• Treat and prevent ulcers: It helps heal existing ulcers in the stomach or small intestine and can prevent new ones from forming.

Because it targets the production of acid at the source, omeprazole provides longer-lasting relief than antacids, which only neutralize acid that is already present. While the medication begins to work shortly after a dose, it may take one to four days of regular use to reach its full effect.

Common Side Effects

The most common side effects of omeprazole include:

• Headache
• Stomach pain
• Nausea or vomiting
• Diarrhea
• Gas
• Constipation
• Dizziness

Serious Side Effects

Contact a healthcare provider immediately if you experience any of the following:

• Signs of an allergic reaction, such as a rash, hives, itching, or swelling of the face, lips, tongue, or throat
• Difficulty breathing or swallowing
• Severe diarrhea with watery stools, stomach pain, or fever
• New or worsening joint pain
• Muscle spasms, uncontrollable shaking, or seizures
• Irregular or fast heartbeat
• Excessive tiredness or lightheadedness
• Blood in the urine or changes in urination frequency

Long-term use of omeprazole may increase the risk of bone fractures in the hip, wrist, or spine. It may also lead to low magnesium levels, vitamin B-12 deficiency, or the development of polyps in the stomach.

Kidney Problems

Omeprazole may cause a type of kidney inflammation called acute tubulointerstitial nephritis. This condition can occur at any point during treatment. Signs may include changes in urination, blood in the urine, or unexplained fatigue.

Severe Diarrhea

The use of proton pump inhibitors like omeprazole may increase the risk of diarrhea caused by Clostridioides difficile. This infection can be severe and may require medical intervention if symptoms such as persistent watery stools, stomach pain, or fever develop.

Bone Fractures

Long-term use or high daily doses of omeprazole may increase the risk of fractures in the hip, wrist, or spine. This risk is generally higher in individuals who take the medication for a year or longer or those who are older.

Nutrient Deficiencies

• Vitamin B12: Taking this medication daily for more than three years may interfere with the body's ability to absorb vitamin B12, potentially leading to a deficiency.
• Magnesium: Low magnesium levels (hypomagnesemia) can occur, usually after a year of treatment. Symptoms may include tremors, muscle spasms, or an irregular heartbeat.

Lupus Erythematosus

Omeprazole has been linked to new or worsening symptoms of lupus, an autoimmune condition. This can affect the skin (cutaneous lupus) or the whole body (systemic lupus). Symptoms may include a rash on the cheeks or arms that worsens in sunlight.

Drug Interactions

Omeprazole can interact with other medications, potentially changing how they work or increasing the risk of side effects. Notable interactions include certain anti-clotting medications, such as clopidogrel, and some cancer treatments like methotrexate. It is important for healthcare providers to review all current medications before starting omeprazole.

Fundic Gland Polyps

Long-term use of omeprazole is associated with an increased risk of developing small growths in the lining of the stomach called fundic gland polyps. These are generally benign but are more common in people who use the medication for more than one year.

Pregnancy

Available data from large studies have not shown an increased risk of major birth defects or other adverse pregnancy outcomes when omeprazole is used during pregnancy. Despite these findings, the medication should only be used if the potential benefit justifies the potential risk to the fetus.

Breastfeeding

Omeprazole passes into human breast milk in small amounts. While there is no evidence of harmful effects on nursing infants, it is important to discuss the use of this medication with a healthcare professional if you are breastfeeding. They can help determine if the treatment is appropriate for your situation.

Professional Guidance

Before starting omeprazole, inform your healthcare provider if you are pregnant, planning to become pregnant, or nursing. They can provide guidance and monitor your health to ensure the safest possible treatment plan.

Available Forms

Omeprazole is primarily available as oral medications. Because the drug can be broken down by stomach acid, most forms are designed with a special coating or combined with other ingredients to ensure the medication reaches the small intestine.

• Delayed-release capsules: These contain enteric-coated granules and are meant to be swallowed whole.
• Delayed-release tablets: These are solid tablets with a protective coating.
• Orally disintegrating tablets: These tablets are designed to dissolve on the tongue without the need for water.
• Powder for oral suspension: This form is mixed with water to create a liquid dose. Some versions contain sodium bicarbonate to help protect the omeprazole from acid.
• Granules for oral suspension: These are mixed with water or specific soft foods as directed by a healthcare provider.

FDA Approval Status

Omeprazole is a proton pump inhibitor (PPI) that is FDA-approved in both prescription and over-the-counter (OTC) forms. The prescription version was first approved for the treatment of various acid-related disorders, while the OTC version was approved in 2003 for the management of frequent heartburn.

Approved Indications

Prescription omeprazole is indicated for the short-term and maintenance treatment of conditions such as gastroesophageal reflux disease (GERD), gastric and duodenal ulcers, and erosive esophagitis. It is also approved for long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison syndrome. The OTC version is approved only for the treatment of frequent heartburn occurring two or more days per week and is not intended for immediate relief of occasional symptoms.

Regulatory Safety Communications

The FDA has issued safety communications regarding the long-term use of PPIs. These communications highlight a possible increased risk of hip, wrist, and spine fractures, especially in individuals taking high doses or using the medication for more than one year. Other regulatory updates have addressed risks such as low magnesium levels (hypomagnesemia) and Clostridium difficile-associated diarrhea associated with this class of drugs.

It is important to continue taking omeprazole for the full duration of treatment prescribed by your doctor, even if you feel better. Stopping the medication early can prevent your condition from healing properly.

Medical Guidance

You should not stop taking prescription omeprazole without first talking to your doctor. If you have been taking this medication for a long period, your healthcare provider may suggest a specific plan to stop the medication, such as gradually reducing your dose, to help prevent a sudden increase in stomach acid production.

Over-the-Counter Use

If you are using over-the-counter omeprazole to treat frequent heartburn, follow these guidelines regarding discontinuation:

• Do not take the medication for more than 14 days unless directed by a doctor.
• If your heartburn continues after the 14-day treatment, or if it returns soon after you stop taking the medication, consult a healthcare professional.
• Do not start a new 14-day course of treatment more often than every four months unless a doctor tells you to do so.