Fosinopril

Keeping blood pressure under control is one of the most effective ways to reduce the long-term risk of heart attack, stroke, and kidney problems. Fosinopril tablets are a licensed prescription medicine belonging to the ACE inhibitor class of antihypertensive medication. They are used in adults to treat hypertension and, in combination with other medicines, to manage heart failure. A prescription can only be issued following a clinical consultation.

Fosinopril tablets are an oral prescription medicine containing fosinopril sodium as the active ingredient. Fosinopril is a prodrug: after you take it, the body converts it to fosinoprilat, the active form that exerts the therapeutic effect. Fosinopril belongs to the angiotensin-converting enzyme (ACE) inhibitor class of medicines.

Fosinopril is licensed in the UK for two indications. First, it is used to treat hypertension (high blood pressure) in adults. Second, it is used as an adjunctive treatment in adult patients with heart failure, alongside diuretics and, where appropriate, cardiac glycosides such as digoxin.

Fosinopril is available as a generic medicine. The 10 mg tablet is the strength available through this service. Because fosinopril is eliminated via both the kidneys and the liver, it may be suitable for some patients who cannot tolerate other ACE inhibitors at standard doses, though any prescribing decision rests with your prescriber following clinical assessment.

Fosinopril works by acting on the renin-angiotensin system, a key hormonal pathway that regulates blood pressure and fluid balance in the body.

The Renin-Angiotensin System

The renin-angiotensin system plays a central role in blood pressure regulation. The kidneys release an enzyme called renin when blood pressure falls or when sodium levels are low. Renin triggers a chain reaction that ultimately produces a hormone called angiotensin II. Angiotensin II causes blood vessels to narrow and signals the adrenal glands to release aldosterone, a hormone that causes the kidneys to retain sodium and water. Both effects raise blood pressure.

ACE Inhibition

Angiotensin-converting enzyme (ACE) is the enzyme responsible for converting angiotensin I into the active angiotensin II. Fosinoprilat, the active form of fosinopril, blocks this enzyme. By inhibiting ACE, fosinopril prevents the production of angiotensin II. Blood vessels remain relaxed and widened, sodium and water retention is reduced, and blood pressure falls as a result.

This same mechanism reduces the workload on the heart, which is why ACE inhibitors are also used in heart failure as part of cardiovascular therapy. Fosinopril does not cure hypertension or heart failure, but helps to manage these conditions when taken consistently and as part of an overall treatment plan agreed with your prescriber.

Always take fosinopril exactly as your prescriber instructs. The following summarises the key points from the current UK SmPC. Read the Patient Information Leaflet included with your medicine before you start treatment.

• Take fosinopril once daily, at approximately the same time each day.
• Fosinopril can be taken with or without food.
• Swallow the tablet whole with a sufficient amount of water.
• If you miss a dose, take it as soon as you remember on the same day. If you only remember the following day, skip the missed dose and continue with your normal schedule. Do not take two doses on the same day to make up for a missed one.
• Do not stop taking fosinopril without speaking to your prescriber first, even if you feel well. Blood pressure and heart failure both require ongoing management.
• Your prescriber may start you on fosinopril at a lower dose, particularly if you are also taking a diuretic, and increase the dose gradually based on your blood pressure response and tolerability. Attend all follow-up appointments so that your blood pressure, kidney function, and electrolyte levels can be monitored as recommended.

Fosinopril 10 mg Tablets

Fosinopril 10 mg is the strength available through this service. For hypertension, the usual starting dose is 10 mg once daily. The prescriber may increase the dose to 20 mg once daily after four weeks if blood pressure is not adequately controlled, and further to a maximum of 40 mg once daily in some patients. For heart failure, the starting dose is usually lower, often 10 mg once daily, with gradual titration based on clinical response and tolerability.

Dose selection and adjustment are clinical decisions. Your prescriber will determine the appropriate dose for you based on your blood pressure readings, kidney function, other medicines you are taking, and your overall health status. Do not change your dose without medical advice.

If you are currently taking a diuretic (water tablet), your prescriber may ask you to stop it two to three days before starting fosinopril, or may start you on a lower dose, to reduce the risk of a sudden fall in blood pressure with the first dose. Your prescriber will advise you on this.

Like all medicines, fosinopril can cause side effects, although not everyone experiences them. The information below is based on the current UK SmPC. Refer to the Patient Information Leaflet for the full list of side effects.

Common Side Effects (may affect up to 1 in 10 people)

• Dry, persistent cough. This is a well-known class effect of ACE inhibitors and is one of the most frequently reported reasons patients switch to an alternative antihypertensive medication. If a troublesome cough develops, speak to your prescriber.
• Dizziness or lightheadedness, particularly on standing up quickly. This may be more noticeable at the start of treatment or after a dose increase.
• Headache
• Fatigue

Uncommon Side Effects (may affect up to 1 in 100 people)

• Nausea or vomiting
• Diarrhoea or abdominal discomfort
• Raised potassium levels in the blood (hyperkalaemia). This is why regular blood tests may be recommended during treatment.
• Impaired kidney function, particularly in patients with pre-existing kidney disease or narrowing of the arteries supplying the kidneys
• Skin rash

Serious Side Effects: Seek Urgent Medical Attention

Go to your nearest accident and emergency department or call 999 immediately if you experience any of the following:

• Angioedema: sudden swelling of the face, lips, tongue, throat, hands, or feet. This is a rare but potentially life-threatening reaction associated with ACE inhibitors. It can occur at any point during treatment, including at the start. If swelling of the throat occurs, breathing may become difficult. Seek emergency medical help immediately.
• Severe low blood pressure causing collapse or loss of consciousness
• Signs of significantly reduced kidney function such as markedly reduced urine output
• Signs of a serious blood disorder such as unusual bruising, persistent infection, or extreme fatigue

Report any suspected side effect to your prescriber, pharmacist, or via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk.

Fosinopril Tablets May Be Suitable If You:

• Are an adult aged 18 or over with a confirmed diagnosis of hypertension or heart failure
• Require antihypertensive medication as part of an ongoing treatment plan for blood pressure control
• Are already prescribed fosinopril and require a repeat prescription through an online prescribing service

Fosinopril Tablets Are Not Suitable If You:

• Are pregnant or planning to become pregnant. ACE inhibitors are contraindicated in pregnancy and can cause serious harm to the developing baby, particularly in the second and third trimesters. Contact your prescriber immediately if you become pregnant while taking fosinopril.
• Are breastfeeding
• Have a history of angioedema related to previous ACE inhibitor treatment, or hereditary or idiopathic angioedema
• Have severe kidney impairment or are on dialysis
• Have a known allergy or hypersensitivity to fosinopril, any other ACE inhibitor, or any excipient listed in the SmPC
• Are taking aliskiren and have diabetes or moderate to severe kidney impairment
• Are under 18 years of age

Tell your prescriber and pharmacist about all medicines you take, including over-the-counter products, vitamins, and herbal supplements. The following interactions are of particular clinical importance:

• Potassium supplements, potassium-sparing diuretics (such as spironolactone or amiloride), and potassium-containing salt substitutes: these can raise blood potassium levels to dangerous levels when combined with fosinopril.
• Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or naproxen: these can reduce the blood pressure-lowering effect of fosinopril and may increase the risk of kidney problems.
• Lithium: ACE inhibitors can increase lithium blood levels and the risk of lithium toxicity. Close monitoring is required if this combination is used.
• Diuretics (water tablets): the combination can cause an excessive fall in blood pressure, particularly with the first dose. Your prescriber will manage this carefully.
• Aliskiren: the combination of an ACE inhibitor with aliskiren is contraindicated in patients with diabetes or significant kidney impairment.

This is not a complete list of interactions. Your prescriber will review all of your current medicines during the clinical assessment before any prescription is considered.

Fosinopril is a Prescription Only Medicine. The clinical consultation is the necessary first step, and the outcome of that consultation determines whether a prescription is appropriate. A prescription will only be issued if a registered prescriber concludes, based on their individual assessment of your circumstances, that fosinopril is clinically suitable for you.

When you complete a consultation through Pharmacy Planet, a registered prescriber will review the clinical information you provide. This includes your blood pressure history, any diagnosis of heart failure, current medicines, kidney function history, and any other relevant medical conditions. The prescriber will then decide whether fosinopril is appropriate, or whether an alternative medicine would better suit your situation.

Not all consultations will result in a prescription being issued. The prescriber may request additional clinical information, suggest a different dose or medicine, or recommend that you see your GP or specialist before online prescribing is appropriate. This process is in place to protect your safety.

If you are being managed for hypertension or heart failure by your GP or a hospital specialist, please keep them informed of any medicines prescribed through online services. Coordinated care gives you the safest outcome.

• Store below 25°C.
• Store in the original packaging to protect from light and moisture.
• Keep out of the sight and reach of children.
• Do not use after the expiry date printed on the packaging.
• Do not dispose of medicines via household waste or wastewater. Return unused or out-of-date tablets to your pharmacist for safe disposal.
• Full storage instructions are available in the Patient Information Leaflet supplied with your medicine.

The table below compares commonly prescribed ACE inhibitor tablets and capsules available at Pharmacy Planet. All are prescription-only medicines that act on the renin-angiotensin system to lower blood pressure.

Important: This comparison is for general information only and does not replace medical advice. A prescriber will decide which treatment is suitable for you following an online consultation.

Pharmacy Planet is a GPhC-registered online pharmacy. Our service provides access to prescription medicines through a structured, clinically led consultation process conducted by registered prescribers. Every prescription is reviewed and dispensed by qualified healthcare professionals.

We operate in full accordance with GPhC standards, MHRA guidance, and ASA advertising regulations. Our aim is to provide accurate, balanced, patient-centred information that helps you understand your treatment options and make informed decisions about your health.

Our pharmacy team is available to answer questions about fosinopril, other antihypertensive medication, or cardiovascular therapy more broadly. We are committed to transparency and to supporting your ongoing care safely and responsibly.

References

1. Electronic Medicines Compendium (eMC). Fosinopril 10 mg tablets — Summary of Product Characteristics. https://www.medicines.org.uk/emc. Accessed May 2026.
2. National Institute for Health and Care Excellence (NICE). Hypertension in adults: diagnosis and management. NICE guideline NG136. https://www.nice.org.uk/guidance/ng136. Accessed May 2026.
3. NHS. High blood pressure (hypertension). https://www.nhs.uk/conditions/high-blood-pressure-hypertension. Accessed May 2026.
4. Joint Formulary Committee. British National Formulary (BNF). Fosinopril sodium. BMJ Group and Pharmaceutical Press. https://bnf.nice.org.uk. Accessed May 2026.
5. Medicines and Healthcare products Regulatory Agency (MHRA). Yellow Card — report a side effect. https://yellowcard.mhra.gov.uk. Accessed May 2026.