• Provides long-lasting relief from acid reflux and indigestion
  • Helps heal and protect the stomach and oesophagus from acid damage
  • Trusted branded version of omeprazole with a proven safety record

How it works?

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Overview

When heartburn or acid reflux keep coming back, it can feel like you’re fighting a losing battle with your own body. Losec Capsules — the original branded form of omeprazole — are a trusted solution that calm excess stomach acid at its source. By easing burning pain, soothing indigestion, and protecting your oesophagus from further irritation, Losec helps you enjoy meals, sleep soundly, and get back to living life without constant discomfort.

At SwiftMedi, your suitability for Losec will always be reviewed by a UK-registered prescriber following a secure online consultation, with discreet delivery to your door.


What are Losec capsules


Losec capsules contain omeprazole, one of the most widely used proton pump inhibitors (PPIs) in the UK. PPIs work by reducing the amount of acid produced in the stomach, providing long-lasting relief from reflux while allowing the oesophagus and stomach lining to heal from irritation and damage.

Losec is commonly prescribed for frequent heartburn and acid reflux, gastro-oesophageal reflux disease (GORD), and for both the treatment and prevention of stomach or duodenal ulcers. It is also used to help protect against ulcers in patients taking NSAIDs long-term.

As a trusted branded version of omeprazole, Losec has built a strong reputation for safety, effectiveness, and reliable relief, making it a recognised first-choice treatment for many patients.

Directions

  • Standard adult dose: 10mg to 40mg once daily, depending on the condition being treated.
  • Take in the morning, ideally before food.
  • Swallow capsules whole with water — do not crush or chew.
  • Duration of treatment ranges from 2–4 weeks for short-term symptoms, to longer-term treatment for conditions like GORD.


Follow your prescriber’s instructions carefully.

Side Effects

Like all medicines, Losec (omeprazole) can cause side effects, although not everyone will experience them. Most are mild, short-lived, and improve as your body adjusts to treatment.

Common (may affect up to 1 in 10 people):

  • Headache – usually mild and temporary.
  • Stomach pain, diarrhoea, constipation, or nausea – digestive problems are the most common side effects but are generally mild.
  • Wind (flatulence) – some people may experience bloating or excess gas.


Uncommon (may affect up to 1 in 100 people):

  • Dizziness, tiredness, or sleep disturbance – these may affect alertness; avoid driving if you feel unwell.
  • Taste changes or dry mouth – usually mild and temporary.
  • Skin rash or itching – typically mild, but seek advice if persistent.


Rare but serious (seek urgent medical advice):

  • Severe allergic reaction (anaphylaxis) – symptoms include swelling of the face, lips, tongue, or throat, difficulty breathing, or a sudden rash.
  • Severe abdominal pain or vomiting blood – may indicate stomach bleeding or ulcer complications.
  • Yellowing of the skin or eyes (jaundice) – a possible sign of liver problems.


Most people tolerate Losec well, and side effects (if they do occur) are generally mild. If you are concerned about any symptoms, or they do not improve, speak to your doctor, pharmacist, or prescriber.

Disclaimer: This is not a complete list of side effects. Always read the patient information leaflet provided with your medicine for full details. If you experience severe or worrying symptoms, seek medical advice straight away. In an emergency, call 999 or go to A&E.

Warnings

Losec may not be suitable if you:

  • Are allergic to omeprazole or other PPIs
  • Have liver problems
  • Take medicines such as warfarin, phenytoin, clopidogrel, methotrexate, or HIV medicines
  • Are pregnant or breastfeeding — seek advice before starting
  • Need long-term treatment — monitoring may be required for vitamin B12, magnesium, or bone health
Frequently asked questions
  • What are Losec capsules and how do they work?

    Losec capsules contain omeprazole, a proton pump inhibitor that reduces stomach acid. They are used for acid reflux, heartburn, indigestion and stomach ulcers. By turning off acid-producing pumps, they help ease burning discomfort and protect the stomach lining during healing.

  • How long do Losec capsules take to relieve reflux or heartburn?

    Some people notice early improvement within a few hours, but full relief usually appears after two to four days of consistent use. The capsules work best for frequent or ongoing symptoms rather than instant relief. Antacids can be used alongside during the first few days if needed.

  • How should I take Losec capsules for best results?

    Swallow Losec capsules whole with water, at least 30 minutes before eating. Taking them first thing in the morning helps improve absorption. Avoid crushing or chewing the granules as this damages their protective coating. Consistent timing each day gives stronger symptom control.

  • What side effects can Losec capsules cause?

    Side effects may include headache, stomach pain, bloating, nausea and changes in bowel habits. Most are mild and settle as your body adjusts. Rare effects include dizziness or low magnesium levels. Speak to a clinician if symptoms persist or worsen.

  • Are Losec capsules safe for long-term use?

    Many people take Losec long term, but regular reviews are recommended. Extended use can affect magnesium, calcium or vitamin B12 levels in some people, so clinicians aim to keep you on the lowest effective dose. Lifestyle adjustments also help reduce reliance.

  • Who should avoid Losec capsules?

    Losec capsules may be unsuitable for people with severe liver disease, unexplained weight loss, difficulty swallowing or symptoms of stomach bleeding. They may also interact with certain medicines, so assessment is important before starting.

  • Can Losec capsules interact with other medicines?

    Yes. Losec may interact with clopidogrel, digoxin, warfarin, some antifungals and medications that rely on stomach acidity for absorption. Tell your clinician about all medicines you take so they can check for safety.

  • Are Losec capsules stronger than generic omeprazole?

    No. Losec is a branded version of omeprazole, but the active ingredient and strength are the same as generics. Some people prefer branded versions due to familiarity or confidence in consistency, but effectiveness is equivalent when taken correctly.

  • Can I open Losec capsules and mix the granules with food?

    If you cannot swallow capsules, you may open them and mix the granules with a small amount of soft food such as applesauce. The granules must not be crushed or chewed, as this damages their coating. Always swallow them whole.

  • Can Losec capsules help with night-time reflux?

    Yes. Although usually taken in the morning, some people benefit from night-time dosing if symptoms worsen when lying down. It should still be taken on an empty stomach for best absorption. Bed elevation and earlier meals also help improve night-time control.

  • Can I take Losec capsules with antacids or Gaviscon?

    Yes. Antacids and alginates such as Gaviscon can offer quick relief while Losec works longer term. Leave a two-hour gap between products to avoid affecting absorption. This combination is helpful during flare-ups.

  • Do Losec capsules help prevent reflux triggered by spicy or acidic foods?

    They can reduce acid levels and ease irritation triggered by spicy, acidic or fatty foods. However, avoiding known triggers, reducing portion sizes and eating earlier in the evening often improves results further. Combining both approaches works best.

  • Are Losec capsules suitable during pregnancy or breastfeeding?

    Losec may be used during pregnancy if symptoms are significant and other treatments haven’t helped. Omeprazole is usually considered safe while breastfeeding. Always confirm suitability during a consultation.

  • How long should I take Losec capsules before reducing the dose?

    Most people use Losec for two to eight weeks before stepping down gradually. Stopping suddenly may cause acid rebound, so a slow taper or switch to H2 blockers can help. A clinician can guide you through this safely.

  • What should I do if Losec capsules stop working as well as before?

    Sometimes a dose adjustment, timing change or switch to another PPI is needed. Persistent symptoms may also relate to diet, alcohol or late meals. If reflux continues despite treatment, assessment is recommended to rule out other causes.