Losec Capsules

From: £29.49

Losec is a branded medication containing the active ingredient Omeprazole. It is available as a 20mg capsule which is taken once daily and works to control symptoms of acid reflux for up to 24 hours. You can buy Losec here from our online pharmacy in complete confidence.

Is this the best treatment for you?

Complete an online consultation (can be completed in 60 seconds!) to determine a suitable treatment.

Go to treatments to start a consultation

FREE Royal Mail
1st Class Delivery

You will need to complete an online consultation for us to determine a suitable treatment.

Go to treatments to start a consultation
Commonly bought add-ons...

    What is Losec?

    Losec contains the active ingredient Omeprazole which belongs to a group of medications called proton pump inhibitors (PPI), which are licensed for the treatment of acid reflux.

    How does Losec work?

    Losec works to control symptoms of acid reflux by reducing acid production in the stomach directly. It does this by blocking an enzyme called a ‘proton pump’, which is involved in the final step of stomach acid formation. Losec works rapidly to control acidity and is effective for up to 24 hours. In some cases it may take up to 4 days to exert its full effect.

    How do I take Losec?

    One Losec 20mg capsule daily should be taken in the morning at least one hour before food for best absorption. The capsules are enteric coated to ensure they do not break down in the stomach before the medication can produce its desired effect, for this reason omeprazole capsules should be swallowed whole with water and they should not be crushed or chewed. 

    For those individuals who have difficulty swallowing medication, the omeprazole capsules can be split open and the contents mixed with water or juice before drinking immediately. If there is no improvement in symptoms after 14 days of taking this medication or symptoms are still present after 28 days of treatment, you should see your GP to discuss alternate options.

    What are the cautions associated with Losec use?

    Although Losec is a commonly prescribed medication in the UK, it is still important to check if the medication is suitable for you. Losec should not be used by people suffering with certain conditions or those using certain medications. You should always read the patient information leaflet (PIL) for Losec before taking this medication to ensure it is safe for you to use.

    Use of Losec and Antacids
    In some patients antacids (Gaviscon, Rennie) may be used in combination with PPIs such as Omeprazole to provide optimal symptom relief. When this combination is used there should be a gap of at least 2 hours between taking the two medications.

    What are the side effects of Losec?

    Losec like all medications can be associated with certain side effects although not all patients would experience these. We recommend seeking medical advice promptly if you experience any signs of an allergic reaction.

    The common full list of side effects of Losec include:

    • Abdominal Pain & Flatulence
    • Diarrhoea
    • Constipation
    • Headache
    • Nausea and Vomiting
    • Liver Problems

    Once you buy Losec, you will receive a patient information leaflet in the pack. For more information about the side effects associated with this medication, please see the patient information leaflet (PIL).


    How do I store Losec Capsules?

    • Keep this medicine out of the sight and reach of children
    • Do not store above 30°C and keep in its original package (blister) to protect from moisture
    • Do not use after the expiry date stated on the product packaging. The expiry date refers to the last day of that month
    • Do not dispose of any medicines via wastewater or household waste. Ask your pharmacist how to safely dispose of any medicines you no longer use

    Where can I find more information about Acid Reflux and Losec?

    Please refer to the patient information leaflet (PIL) for Losec for further information about this medication or consult your doctor. You can find more information about Acid Reflux on the Conditions category page.

Although all of our content is written and reviewed by healthcare professionals, it should not be substituted for or used as medical advice. If you have any questions about your health, please speak to your doctor.

Authored Dec 02, 2015 by Joseph Issac, MPharm
Reviewed May 04, 2022 by Prabjeet Saundh, MPharm

Registered Service

National Pharmacy Association Logo
Registered Pharmacy 9010203
General Pharmaceutical logo
MHRA logo
Fully Registered
Confidential & discreet
Free Delivery
Low Price Gurantee

Contact Us

Call: 020 8894 6080

Office Hours:
9am-5pm Weekdays
9am-12pm Saturday

*We are closed on Bank Holidays


PostMyMeds Ltd.
VAT Number: 219 8747 65

Visit us

132 High Street Whitton

Click here for a map

Trustpilot Reviews

COPYRIGHT © 2021 - PostMyMeds Ltd

Secure and safe

  • Sign of online payment method
  • Thumbnail of mastercard
  • label of  sage payment method
  • Image of registered pharmacy
  • Comodo Trusted Site Seal
  • PayPal