Patient info

Olmesartan 20 mg film-coated tablets – patient leaflet, side effects, dosage

Updated:
Key facts
Status:
Prescription only (POM)
Medicine strength:
20 mg
Contains active substance:

Patient leaflet - Olmesartan 20 mg film-coated tablets

1. What Olmesartan is and what it is used for

Olmesartan belongs to a group of medicines called angiotensin-II receptor antagonists. They lower blood pressure by relaxing the blood vessels.

Olmesartan is used for the treatment of high blood pressure (also known as ‘hypertension’) in adults and in children and adolescents aged 6 to less than 18 years. High blood pressure can damage blood vessels in organs such as the heart, kidneys, brain and eyes. In some cases this may lead to a heart attack, heart or kidney failure, stroke or blindness. Usually high blood pressure has no symptoms. It is important to have your blood pressure checked to prevent damage occurring.

High blood pressure can be controlled with medicines such as Olmesartan tablets. Your doctor has probably also recommended that you make some changes in your lifestyle to help lower your blood pressure (for example losing weight, giving up smoking, reducing the amount of alcohol you drink and reducing the amount of salt in your diet). Your doctor may also have urged you to take regular exercise, such as walking or swimming. It is important to follow this advice from your doctor.

2. What you need to know before you take Olmesartan

Do not take Olmesartan

  • if you are allergic to olmesartan medoxomil or any of the other ingredients of this medicine (listed in section 6).
  • if you are more than 3 months pregnant. (It is also better

    to avoid Olmesartan in early pregnancy – see pregnancy section.)

    • if you suffer from yellowing of the skin and eyes (jaundice) or problems with drainage of the bile from the gallbladder (biliary obstruction e.g. gallstones).
    • if you have diabetes or impaired kidney function and you are treated with a blood pressure lowering medicine containing aliskiren.

Warnings and precautions

Talk to your doctor or pharmacist before taking Olmesartan.

Tell your doctor if you are taking any of the following medicines used to treat high blood pressure:

  • an ACE-inhibitor (for example enalapril, lisinopril, ramipril), in particular if you have diabetes

    ‑

    related kidney problems.

  • aliskiren.

Your doctor may check your kidney function, blood pressure, and the amount of electrolytes (e.g. potassium) in your blood at regular intervals.

See also information under the heading “Do not take Olmesartan”

Tell your doctor if you have any of the following health problems:

  • Kidney problems
  • Liver disease
  • Heart failure or problems with your heart valves or heart muscle
  • Severe vomiting, diarrhoea, treatment with high doses of water tablets (diuretics) or if you are on a low salt diet
  • Increased levels of potassium in your blood
  • Problems with your adrenal glands

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      If you are taking an ACE-inhibitor or aliskiren (see also information under the headings “Do not take Olmesartan” and “Warnings and precautions”).

      • Potassium supplements, a salt substitute which contains potassium, water tablets (diuretics) or heparin (for thinning the blood). Using these medicines at the same time as Olmesartan may raise the levels of potassium in your blood.
      • Lithium (a medicine used to treat mood swings and some types of depression) used at the same time as Olmesartan may increase the toxicity of lithium. If you have to take lithium, your doctor will measure your lithium blood levels.
      • Non-Steroidal Anti-Inflammatory (NSAIDs) medicines (medicines used to relieve pain, swelling and other symptoms of inflammation, including arthritis) used at the same time as Olmesartan may increase the risk of kidney failure and the effect of Olmesartan can be decreased by NSAIDs.
      • Colesevelam hydrochloride, a drug that lowers the level of cholesterol in your blood, as the effect of Olmesartan may be decreased. Your doctor may advise you to take Olmesartan at least 4 hours before.
      • Certain antacids (indigestion remedies), as the effect of Olmesartan can be slightly decreased.

Older people

Black patients

As with other similar drugs the blood pressure lowering effect of Olmesartan is somewhat less in black patients. Olmesartan with food and drink

Olmesartan can be taken with or without food. Pregnancy and breast-feeding

If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine. Pregnancy

You must tell your doctor if you think that you are (or might become) pregnant. Your doctor will normally advise you to stop taking Olmesartan before you become pregnant or as soon as you know you are pregnant and will advise you to take another medicine instead of Olmesartan. Olmesartan is not recommended in early pregnancy, and must not be taken when more than 3 months of pregnant, as it may cause serious harm to your baby if used after the third month of pregnancy.

Breastfeeding

Tell your doctor if you are breast-feeding or about to start breast-feeding. Olmesartan is not recommended for mothers who are breast-feeding, and your doctor may choose another treatment for you if you wish to breast-feed, especially if your baby is newborn, or was born prematurely.

Driving and using machines

You may feel sleepy or dizzy while being treated for your high blood pressure. If this happens, do not drive or use machines until the symptoms wear off. Ask your doctor for advice.

Olmesartan contains lactose

If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.

3. How to take Olmesartan

Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

Adults

The recommended starting dose is one 10 mg tablet once a day. However, if your blood pressure is not controlled, your doctor may decide to change your dose up to 20 or 40 mg once a day, or prescribe additional medicines. Children and adolescents from 6 to less than 18 years of age

The recommended starting dose is 10 mg once daily. If the patient’s blood pressure is not adequately controlled, the doctor may decide to change the dose up to 20 or 40 mg once a day. In children who weigh less than 35 kg, the dose will not be higher than 20 mg once a day. In patients with mild to moderate kidney disease, your dose will not be higher than 20 mg once a day. The tablets can be taken with or without food. Swallow the tablets with a sufficient amount of water (e.g. one glass). If possible, take your daily dose at the same time each day, for example at breakfast time.

If you take more Olmesartan than you should

If you take more tablets than you should or if a child accidentally swallows some, go to your doctor or nearest emergency department immediately and take your medicine pack with you.

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If you forget to take Olmesartan

If you forget a dose, take your normal dose on the following day as usual. Do not take a double dose to make up for a forgotten dose.

If you stop taking Olmesartan

It is important to continue to take Olmesartan unless your doctor tells you to stop.

If you have any further questions on the use of this medicine, ask your doctor or pharmacist.

4. Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them. If they do occur, they are often mild and do not require treatment to be stopped. Although not many people may get them, the following side effects can be serious:

On rare occasions (may affect up to 1 in 1,000 people) the following allergic reactions, that may affect the whole body have been reported:

Swelling of the face, mouth and/or larynx (voice box) together with itching and rash may occur during treatment with Olmesartan. If this happens stop taking Olmesartan and contact your doctor immediately.

Rarely (but slightly more often in older people) Olmesartan can cause the blood pressure to fall too low in susceptible individuals or as the result of an allergic reaction. This could cause severe light-headedness or fainting. If this occurs stop taking Olmesartan, contact your doctor immediately and lie down flat.

Frequency not known: If you experience yellowing of the whites of the eyes, dark urine, itching of the skin, even if you started therapy with Olmesartan longer time ago, contact your doctor immediately who will evaluate your symptoms and decide on how to continue your blood pressure medication.

These are the other side effects known about so far with Olmesartan:

Common side effects (may affect up to 1 in 10 people): Dizziness, headache, nausea, indigestion, diarrhoea, stomach ache, gastroenteritis, tiredness, sore throat, runny or stuffy nose, bronchitis, flu-like symptoms, cough, pain, pain in the chest, back, bones or joints, infection of the urinary tract, swelling of ankles, feet, legs, hands or arms, blood in the urine.

Some changes in blood test results have also been seen and include the following:

Increased fat levels (hypertriglyceridaemia), increased uric acid levels (hyperuricaemia), rise in blood urea, increases in tests of liver and muscle function.

Uncommon side effects (may affect up to 1 in 100 people): Quick allergic reactions that may affect the whole body and may cause breathing problems as well as a rapid fall of blood pressure that may even lead to fainting (anaphylactic reactions), vertigo, vomiting, weakness, feeling unwell, muscular pain, skin rash, allergic skin rash, itching, exanthema (skin eruption), skin lumps (wheals), angina (pain or uncomfortable feeling in the chest).

In blood tests a reduction of the numbers of a type of blood cell, known as platelets has been seen

(thrombocytopenia).

Rare side effects (may affect up to 1 in 1,000 people): Lack of energy, muscle cramps, impaired kidney function, kidney failure, intestinal angioedema: a swelling in the gut presenting with symptoms like abdominal pain, nausea, vomiting and diarrhoea.

Some changes in blood test results have also been seen. These include increased potassium levels (hyperkalaemia) and increased levels of compounds related to kidney function.

Children and adolescents

In children, side effects are similar to those reported in adults. However, dizziness and headache are seen more often in children, and nose bleeding is a common side effect seen in children only.

Reporting of side effects

If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via Yellow Card Scheme, or search for MHRA Yellow Card in the Google Play or Apple App Store.Website: yellowcard.mhra.gov.uk.

By reporting side effects you can help provide more information on the safety of this medicine.

5. How to store Olmesartan

Keep this medicine out of the sight and reach of children. Do not use this medicine after the expiry date which is stated on the packaging after EXP. The expiry date refers to the last day of that month.

This medicinal product does not require any special storage conditions.

Do not throw away any medic household waste. Ask your ph medicines you no longer use. protect the environment.

6. Contents of the pa information

What Olmesartan contains

  • The active substance is olm Each Olmesartan 10 mg film 10 mg olmesartan medoxom Each Olmesartan 20 mg film 20 mg olmesartan medoxom Each Olmesartan 40 mg film 40 mg olmesartan medoxom
  • The other ingredients are ce lactose monohydrate, low-s hydroxypropylcellulose and tablet core and, titanium dio poly(vinyl alcohol) in the film
  • See section 2 “Olmesartan What Olmesartan looks like

Film-coated tablets of 10 mg biconvex film-coated tablets, one side of the tablet; tablet d 2.4 mm – 3.4 mm.

Film-coated tablets of 20 mg biconvex film-coated tablets, one side of the tablet; tablet d 3.4 mm – 4.5 mm.

ines via wastewater or armacist how to throw away These measures will help

ck and other

esartan medoxomil.

-coated tablet contains il.

-coated tablet contains il.

-coated tablet contains il.

llulose microcrystalline, ubstituted

magnesium stearate in the xide, talc, macrogol 3000 and coating.

contains lactose”.

and contents of the pack

are white, round, slightly engraved with a mark S1 on iameter: 6.5 mm, thickness

are white, round, slightly engraved with a mark S2 on iameter: 8 mm, thickness

Film-coated tablets of 40 mg are white, oval, biconvex film-coated tablets, engraved with a mark S3 on one side of the tablet; tablet dimensions: 13 x 8 mm, thickness 4.3 mm – 5.5 mm.

Olmesartan 10 mg, 20 mg and 40 mg film-coated tablets are available in boxes of 10, 14, 28, 30, 56, 60, 84, 90, 98 and 100 film-coated tablets in blisters and in tablet containers of 100 film-coated tablets.

Not all pack sizes may be marketed.

Marketing Authorisation Holder

KRKA, d.d., Novo mesto, Šmarješka cesta 6, 8501 Novo mesto, Slovenia

Manufacturer

KRKA, d.d., Novo mesto, Šmarješka cesta 6, 8501 Novo mesto, Slovenia

TAD Pharma GmbH, Heinz-Lohmann-Straße 5, 27472 Cuxhaven, Germany

This leaflet was last revised in March 2025.

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About this document

Source: MHRA - Medicines and Healthcare products Regulatory Agency (products.mhra.gov.uk) · Marketing authorisation: PL 01656/0272

Last revision stated in the text: March 2025 · MHRA data as of 13 October 2026

Found a mistake? Tell us on the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Facts about Olmesartan 20 mg film-coated tablets

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Olmesartan
Strength 20 mg
Pharmaceutical form Oral tablet
20 mg: white, round, slightly biconvex film-coated tablets, engraved with a mark S2 on one side of the tablet; tablet diameter: 8 mm, thickness 3.4 mm – 4.5 mm.
How is it taken Oral
Excipients Cellulose, microcrystalline, Lactose monohydrate, Low-substituted hydroxypropylcellulose, Magnesium stearate, Titanium dioxide, Talc, Macrogol 3000, Poly(vinyl alcohol)
Pack sizes 28 tablet
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Shelf life 3 years
Storage This medicinal product does not require any special storage conditions.
Drug group (ATC) Angiotensin II antagonists, plain
  1. C Cardiovascular system drugs
    1. C09 Agents acting on the renin-angiotensin system
      1. C09C Angiotensin II receptor blockers (ARBs), plain
        1. C09CA Angiotensin II receptor blockers (ARBs), plain
          1. C09CA08 olmesartan medoxomil
Marketing authorisation PL 01656/0272 (first authorised 7 February 2021)
Marketing authorisation holder KRKA, d.d., Novo mesto, Šmarješka cesta 6, 8501 Novo mesto, Slovenia
Codes GTIN 3838989763060 · BNF 02050502

Sources: the MHRA product information (products.mhra.gov.uk) and the NHS Dictionary of Medicines and Devices (dm+d), release 10.2.0 of 19 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.