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Buy Omeprazole 20 Mg Capsules Online from Canadian Pharmacy


Omeprazole is an FDA-approved medication used to treat gastroesophageal reflux disease (GERD), stomach ulcers, duodenal ulcers, and Zollinger-Ellison syndrome. It works by reducing the amount of acid produced in the stomach, providing relief from symptoms like heartburn and stomach pain. Omeprazole is available in 3 different forms and strengths: 2.5 mg, 10 mg, 20 mg, and 40 mg. It is important to follow the prescribed dosage and take precautions to avoid side effects such as fever, vomiting, headache, diarrhea, and stomach pain. Consult a healthcare provider for personalized advice and treatment.

Product Overview

Omeprazole is a proton pump inhibitor (PPI) that effectively treats conditions associated with excessive stomach acid production. The active ingredient is Omeprazole itself, which works by inhibiting the proton pumps in the stomach lining, which is responsible for acid production. It is commonly used to manage gastroesophageal reflux disease (GERD), stomach and duodenal ulcers, erosive esophagitis, and Zollinger-Ellison syndrome, conditions that arise from overproduction of stomach acid leading to discomfort and damage to the digestive tract.

This medication is available in various forms, including delayed-release capsules, granules for oral suspension, and oral tablets. The typical regimen for Omeprazole involves taking the drug once daily, preferably in the morning, with or without food. The dosage and duration of treatment are determined based on the specific condition being treated and the individual’s response to the medication. Omeprazole is suitable for adults, teens, and children, with dosage adjustments made according to their age and body weight. It is crucial to consult a healthcare provider for appropriate dosing and to ensure the medication is taken correctly for maximum effectiveness.

The common side effects of this medicine include fever, vomiting, headache, diarrhea, nausea, and stomach pain, while serious side effects may require immediate medical attention. Patients should inform their healthcare provider about any allergies, medications, and medical conditions before taking Omeprazole. Long-term use of the medication may increase the risk of bone fractures and low magnesium levels, necessitating regular monitoring. It is essential to store Omeprazole at room temperature, away from moisture and heat, and out of reach of children. Patients should follow the prescribed dosage and duration of treatment closely and discuss potential interactions with other medications with their healthcare provider.

Uses of Omeprazole 

This medication is used to treat conditions that happen when there’s too much acid in the stomach. These conditions include:

  • GERD (Gastroesophageal reflux disease), where stomach acid flows back into the tube connecting your mouth and stomach, causing heartburn and other symptoms.
  • Infections in the stomach are caused by Helicobacter pylori bacteria (H. Pylori).
  • Stomach and duodenal ulcers, are painful sores in the stomach or the beginning of the small intestine.
  • Erosive esophagitis, which is when the acid damages the lining of the esophagus.
  • Zollinger-Ellison syndrome, is a rare condition that causes the stomach to produce too much acid.

Omeprazole might be used with other medications as part of combination therapy to treat these conditions effectively.

How to Use Omeprazole?


Omeprazole comes in the following forms and strengths:

  • Delayed-Release Capsules
      • Omeprazole 10 mg capsules
      • Omeprazole 20 mg capsules
      • Omeprazole 40 mg capsules
  • Granules for Oral Suspension
      • Omeprazole 2.5 mg/ml
      • Omeprazole 10 mg/ml 
  • Oral Tablets
    • Omeprazole 20 mg tablets

Recommended Dosage for Omeprazole

For Adults with Duodenal Ulcers

  • Take 20 mg once daily before a meal.

For Adults with Duodenal Ulcers with H. Pylori

  • Take 20 or 40 mg once, twice, or three times daily before a meal, often combined with clarithromycin and amoxicillin. 

For Adults with Zollinger-Ellison Syndrome

  • Take 60 mg once daily before a meal. 

For Adults with Erosive Esophagitis

  • Take 20 mg once daily before a meal.

For Adults with Gastric Ulcers

  • Take 40 mg once daily before a meal. 

For Erosive Esophagitis Caused by Acid-Mediated GERD

  • Teens and Adults (17 years and older): Take 20 mg once daily before a meal.
  • Children (1 to 16 years): Dosage is based on body weight, usually 5 to 20 mg once daily before a meal.
  • Infants (1 month to younger than one year): Dosage is based on body weight, usually 2.5 to 10 mg once daily before a meal.
  • Newborns (younger than one month): Usage and dosage must be customized by your healthcare provider.

For Gastroesophageal Reflux Disease (GERD)

  • Adults: Take 20 mg once daily before a meal. Your doctor may recommend taking Omeprazole for more than eight weeks for specific conditions.
  • Children (1 year and older): Dosage is based on body weight, usually 5 to 20 mg once daily before a meal.
  • Infants (younger than one year): Usage and dosage must be customized by your healthcare provider.

[Note: Remember these recommendations may vary depending on person to person. Discuss it with your doctor, and they’ll customize your dosage accordingly.]

How to Take It?

  • Omeprazole is typically taken once a day, ideally in the morning. It’s gentle on your stomach, so you can take it with or without food.
  • If you need to take Omeprazole twice a day, have one dose in the morning and another in the evening.
  • Swallow the tablets and capsules whole with a glass of water or juice.
  • If you have trouble swallowing capsules, many Omeprazole capsules can be opened. You can then mix the granules with a small amount of water or juice, or sprinkle them on soft food like yogurt or apple puree.
  • For children and individuals who can’t swallow capsules or tablets, a doctor can prescribe liquid Omeprazole.
  • If you or your child are prescribed liquid Omeprazole, your pharmacist will usually prepare it for you. It will come with a syringe or spoon to ensure you take the correct dose. If you don’t have a syringe or spoon, ask your pharmacist for one. Avoid using a kitchen teaspoon as it won’t provide an accurate measurement.

[Note: Your doctor will decide the right amount for you based on your condition, following guidelines and studies on the drug. They’ll adjust it as needed over time.]

How Does Omeprazole Work?

Omeprazole is a proton pump inhibitor (PPI), also known as a hydrogen-potassium pump. Proton pumps are found in the lining of the stomach and are responsible for producing stomach acid. When you take Omeprazole, it works by blocking these proton pumps, which reduces the amount of acid released into the stomach. This helps decrease the overall acidity levels inside the stomach. It takes about 1 hour for Omeprazole to start reducing stomach acid production, and its maximum effect is usually reached around 2 hours after taking the pill. The effects of Omeprazole can last for up to 3 days.

Important Safety Information

Side Effects

These are the more common side effects of using Omeprazole in children and adults:

  • Fever 
  • Vomiting 
  • Headache
  • Diarrhea 
  • Nausea
  • Stomach pain
  • Gas 

Serious side effects of Omeprazole may need immediate medical attention. If they occur, call your doctor right away. 

  • Low magnesium levels symptoms may include:
    • Muscle weakness
    • Tremors
    • Dizziness
    • Spasms of your hands and feet
    • Irregular or fast heart rate
    • Cramps or muscle aches
    • Seizures
    • Spasm of your voice box
    • Jitteriness
  • Vitamin B-12 deficiency symptoms can include:
    • Changes in menstruation
    • Numbness or tingling in your hands and feet
    • Poor muscular coordination
    • Nervousness
    • Neuritis (inflammation of a nerve)
  • Severe diarrhea symptoms can include:
    • Stomach pain
    • Watery stool
    • Fever that doesn’t go away
  • Inflammation of your stomach lining symptoms can include:
    • Nausea 
    • Vomiting 
    • Stomach pain
    • Weight loss
  • Kidney Damage symptoms can include:
    • Changes in urination
    • Flank pain (pain in your back and side)
  • Cutaneous lupus erythematosus (CLE) signs may include:
    • Raised, purple, red, or scaly rash on your body
    • Rash (can involve the skin of the nose)
  • Systemic lupus erythematosus (SLE) symptoms can include:
    • Heartburn
    • Weight loss
    • Blood clots
    • Tiredness
    • Fever
  • Fundic gland polyps
  • Bone fractures

[Note: Remember, this list may not cover all possible side effects. Always consult with your healthcare giver for medical advice about side effects.]


Low Magnesium Levels: Using Omeprazole for three months or more can lead to low magnesium levels in your body, with a higher risk if used for a year or longer. Symptoms of low magnesium include seizures, irregular or rapid heartbeat, jitteriness, shaking, muscle weakness, and cramps or spasms in your hands, feet, and voice box. Your doctor may monitor your magnesium levels before and during treatment with Omeprazole.

Severe Diarrhea: Omeprazole may increase your risk of severe diarrhea. This could be due to an infection in your intestines caused by Clostridium difficile bacteria. Contact your doctor immediately if you experience persistent watery diarrhea, stomach pain, and fever.

Fundic Gland Polyps: Long-term use of Omeprazole, particularly for over a year, can lead to the development of fundic gland polyps, which are growths on the lining of your stomach that can become cancerous. To reduce the risk of these polyps, use Omeprazole for the shortest time possible.

Lupus: Omeprazole can cause systemic lupus erythematosus (SLE) and cutaneous lupus erythematosus (CLE), both autoimmune diseases. CLE symptoms may include a raised, scaly, red, or purple rash. SLE symptoms include blood clots, fatigue, weight loss, fever, heartburn, and stomach pain. If you experience any of these symptoms, contact your doctor.

Bone Fractures: Taking Omeprazole regularly for a year or more may raise your risk of bone fractures, especially in the hip, wrist, or spine. Discuss your risk of bone fractures with your doctor. Follow your doctor’s instructions carefully, taking the lowest effective dose for the shortest duration necessary.


  • Before taking Omeprazole, inform your doctor or pharmacist if you have any allergies to this medication or similar drugs like esOmeprazole, lansoprazole, or pantoprazole. Also, this medication may contain inactive ingredients that can cause allergic reactions or other issues, so it’s important to discuss this with your pharmacist.
  • Make sure to tell your doctor about all the medications you are taking, including prescription and non-prescription drugs, before any surgery.
  • Using proton pump inhibitors like Omeprazole for a longer period, especially at high doses, can increase the risk of bone fractures, particularly in older adults. Talk to your doctor or pharmacist about ways to prevent bone loss and fractures, such as taking calcium (like calcium citrate) and vitamin D supplements.

Other Important Precautions

  • Older adults may be more sensitive to the side effects of this drug, especially bone loss and fractures, as well as C. difficile infection.
  • Children may also be more sensitive to the side effects of this drug, particularly fever, cough, and infections of the nose, throat, and airways.
  • Use this medication during pregnancy only when needed. Discuss the risks and benefits with your doctor.
  • Omeprazole can pass into breast milk, but its effects on a nursing infant are not well understood. Consult your doctor before breastfeeding.

Missed Dose

  • If you normally take your medication once a day and you miss a dose, take it as soon as you remember. However, if there are 12 hours or less until your next scheduled dose, skip the missed dose.
  • If you usually take your medication twice a day and you miss a dose, take it as soon as you remember. But if there are 4 hours or less until your next scheduled dose, skip the missed dose.
  • Do not take two doses simultaneously to make up for a missed dose.
  • If you often forget to take your medication, setting an alarm as a reminder may be helpful. You can also talk to your pharmacist for other suggestions on how to remember to take your medication.

[Note: If you have missed a dose of your medication and are unsure about when to take the next one, immediately consult your doctor or pharmacist.]


If you accidentally take 1 or 2 extra doses, it’s unlikely to cause serious issues. However, if you take more than your prescribed dose and experience any of the following symptoms, contact your doctor immediately:

  • Blurred vision
  • Increased sweating
  • Dryness of the mouth
  • Confusion
  • Headache
  • Flushing

[Note: If you consumed more than recommended dose, get medical help right away, or call the Poison Help line at 1-800-222-1222.]


  • Store Omeprazole capsules in a cool, dry place at room temperature (15-30°C or 59-86°F).
  • Protect it from excessive heat, moisture, and direct sunlight. 
  • Avoid storing it in the bathroom. 
  • Keep the medication out of reach of children. 
  • Proper storage helps maintain the effectiveness of Omeprazole over the counter, ensuring its stability for safe and reliable use.

[Note: Discuss with your healthcare professional about the proper disposal of any unused medicine and any questions you may have regarding its storage.]

Omeprazole Interactions

Don’t take this medication with the following drugs:

  • Citalopram
  • Medications for anxiety, panic, and sleep disorders, such as diazepam
  • Dasatinib
  • Diuretics (water pills)
  • Digoxin
  • Antifungal medications such as itraconazole, ketoconazole, and voriconazole
  • Medications that prevent or treat blood clots, like warfarin
  • Clopidogrel
  • Rilpivirine
  • Cyclosporine
  • Disulfiram
  • Nelfinavir
  • Erlotinib
  • Iron supplements
  • Medicines for seizures, like carbamazepine, phenobarbital, and phenytoin
  • Methotrexate
  • Mycophenolate mofetil
  • Nilotinib
  • Rifampin
  • St. John’s wort
  • Tacrolimus
  • Vitamin B12
  • Certain antiviral medications used to treat HIV or hepatitis
  • Atazanavir
  • Cilostazol

This list might not include all possible interactions. It’s crucial to inform your healthcare provider about all the medicines, herbs, non-prescription drugs, or dietary supplements you’re using. Also, let them know if you smoke, drink alcohol, or use illegal drugs, as some substances may interact with your medication.

[Note: This isn’t a complete list, and there could be other drugs that interact with Omeprazole. Make sure to tell your doctor any prescription, over-the-counter medicines, and herbal products you’re taking.]

Omeprazole Alternatives

  • Protonix (pantoprazole)
  • Tums (calcium carbonate)
  • Prevacid (lansoprazole)
  • Zantac 360 Maximum Strength (ranitidine)
  • Pepcid AC Maximum Strength (famotidine)
  • Mylanta Maximum Strength (aluminum hydroxide-magnesium hydroxide-simethicone)
  • Dexilant (dexlansoprazole)
  • Rolaids Extra Strength (calcium carbonate-magnesium hydroxide)
  • Carafate (sucralfate)
  • Nexium (esOmeprazole)
  • Gaviscon (aluminum hydroxide-magnesium carbonate)
  • Aciphex (rabeprazole)
  • Zegerid (Omeprazole/sodium bicarbonate)
  • Tagamet HB 200 (cimetidine)
  • Nizatidine

[Note: Your doctor will choose what’s best for you. Don’t use any of these alternative medications without consulting your healthcare provider. Taking them by yourself may cause serious side effects.] 

Frequently Asked Questions

What to avoid when taking Omeprazole?

It’s best to avoid foods that can slow down your digestive system and cause discomfort when you take Omeprazole. These include greasy or fatty foods such as french fries, pizza, and deep-fried chicken, which can lead to indigestion, heartburn, and nausea. Additionally, certain foods like coffee, garlic, peppermint, chocolate, onions, and some spices may increase gastric symptoms.

Can I use Omeprazole for heartburn relief?

Yes, you can use Omeprazole for heartburn relief. It helps by reducing the amount of acid your stomach produces, easing the discomfort of heartburn. It’s available over-the-counter, and you can follow the recommended dosage on the packaging. If you have questions or if heartburn persists, consult with a healthcare professional for personalized advice on managing your symptoms effectively.

Is it safe to use Omeprazole for acid reflux long-term?

Using Omeprazole for acid reflux long-term should be done under your healthcare provider’s guidance. While it’s effective for short-term relief, prolonged use may have potential risks. Discuss your symptoms and treatment plan with your healthcare provider, who can help determine the safest and most effective approach to managing acid reflux over an extended period, considering your individual health needs.

How long does it take for Omeprazole to work?

Omeprazole typically starts working within a few days, but it may take up to a week for full relief of symptoms like heartburn. Remember to take it regularly as prescribed, usually before a meal. If you don’t feel better after a week or if your symptoms persist, check with your healthcare provider for advice on adjusting your treatment plan.

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