Fosinopril: ACE Inhibitor for Blood Pressure and Heart Health

What is Fosinopril?

Fosinopril is a prescription medication belonging to a class of drugs called ACE inhibitors (angiotensin-converting enzyme inhibitors). It is primarily used to treat high blood pressure and heart failure by helping blood vessels relax and reducing the workload on the heart. Fosinopril is unique among ACE inhibitors because it is eliminated by both the kidneys and liver, making it suitable for patients with kidney problems.

Uses

Fosinopril has several FDA-approved medical uses:

• High blood pressure (hypertension): Used alone or in combination with other medications to lower blood pressure and reduce the risk of stroke, heart attack, and kidney problems
• Heart failure: Helps improve symptoms and survival in patients with heart failure by reducing the heart’s workload
• Diabetic kidney disease: May help slow the progression of kidney damage in people with diabetes
• Post-heart attack protection: Sometimes prescribed after a heart attack to improve survival and prevent future cardiovascular events
• Chronic kidney disease: Used to help protect kidney function and slow disease progression in certain patients

How it works

Fosinopril works by blocking the action of angiotensin-converting enzyme (ACE), which normally converts angiotensin I to angiotensin II, a powerful substance that causes blood vessels to narrow. By inhibiting this enzyme, fosinopril prevents the formation of angiotensin II, allowing blood vessels to relax and widen. This reduces blood pressure and decreases the amount of work the heart must do to pump blood throughout the body.

Side effects

Common side effects include:

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• Dry cough (occurs in 10-15% of patients)
• Dizziness or lightheadedness
• Fatigue or weakness
• Headache
• Nausea
• Diarrhea
• Muscle cramps
• Skin rash

Serious side effects that require immediate medical attention:

• Angioedema (swelling of face, lips, tongue, or throat)
• Severe allergic reactions
• Kidney problems or kidney failure
• Dangerously high potassium levels
• Severe drop in blood pressure

Warnings and precautions

• Pregnancy: Fosinopril can cause serious harm to an unborn baby and should not be used during pregnancy, especially in the second and third trimesters
• Kidney disease: While fosinopril can be used in patients with mild to moderate kidney impairment, kidney function should be monitored regularly
• Liver disease: Patients with severe liver problems may need dosage adjustments or alternative treatments
• Angioedema history: Patients who have previously experienced angioedema with any ACE inhibitor should not use fosinopril
• Electrolyte monitoring: Regular blood tests are needed to monitor potassium levels and kidney function

Interactions

Fosinopril can interact with several medications and supplements:

• Potassium supplements and salt substitutes: Can cause dangerously high potassium levels
• Diuretics: May cause excessive blood pressure lowering, especially when starting treatment
• NSAIDs (ibuprofen, naproxen): Can reduce fosinopril’s effectiveness and increase kidney damage risk
• Lithium: Fosinopril can increase lithium levels, leading to toxicity
• Diabetes medications: ACE inhibitors may enhance blood sugar-lowering effects
• Aliskiren: Should not be used together in patients with diabetes or kidney disease
• ARBs (losartan, valsartan): Combining with fosinopril increases risk of kidney problems and high potassium
• Gold injections: Rare reports of serious reactions when used with ACE inhibitors

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Dosage

Typical adult dosages for fosinopril vary based on the condition being treated:

• High blood pressure: Initial dose is usually 10 mg once daily, which may be increased to 20-40 mg once daily as needed
• Heart failure: Starting dose is typically 10 mg once daily, gradually increased to 20-40 mg once daily as tolerated
• Maximum dose: Generally should not exceed 40 mg daily

Dosage should always be individualized and determined by a healthcare provider based on the patient’s condition, response to treatment, and other factors. Regular monitoring is essential to ensure safe and effective treatment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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