Each Losec capsule contains omeprazole 10, 20 or 40 mg as the active ingredient; plus, Mannitol (E421), hydroxypropyl cellulose, microcrystalline cellulose (E 460), lactose-anhydrous, sodium lauryl sulphate, sodium phosphate - dibasic dehydrate, as enteric-coated granules in bottles of 30 capsules. The enteric coating is hypromellose, macrogol 400 and methacrylic acid copolymer. The gelatine (E441) capsule is coloured with red iron oxide (E 172) and titanium dioxide (E 171). Losec does not contain gluten.

The dose of Losec is usually 20 mg a day, but may vary from 10 mg to 40 mg a day depending on what condition you are being treated for and how severe it is. 

Tell your doctor or pharmacist as soon as possible if you do not feel well while you are taking Losec. Losec helps most people with stomach or duodenal ulcers or reflux disease, but it may have unwanted side effects in a few people. All medicines can have side effects. Sometimes they are serious, most of the time they are not. You may need medical treatment if you get some of the side effects. Ask your doctor or pharmacist to answer any questions you may have. Tell your doctor if you notice any of the following and they worry you:  constipation  nausea or vomiting  diarrhoea and wind (flatulence)  headache  stomach pain These are all mild side effects of Losec.