Fosinopril

What is Fosinopril?

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

Uses

Fosinopril is approved for several cardiovascular conditions:

• 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 chronic heart failure by reducing the strain on the heart
• Diabetic kidney disease: May help protect kidney function in patients with diabetes by reducing protein in the urine
• Post-heart attack protection: Sometimes prescribed after a heart attack to prevent further cardiovascular events and improve heart function
• Chronic kidney disease: Used to slow the progression of kidney disease in certain patients

How it works

Fosinopril works by blocking an enzyme called angiotensin-converting enzyme (ACE), which is responsible for producing a hormone called angiotensin II. Angiotensin II normally causes blood vessels to narrow and promotes the retention of sodium and water, leading to increased blood pressure. By inhibiting ACE, fosinopril allows blood vessels to relax and widen, while also reducing fluid retention, which ultimately lowers blood pressure and reduces the workload on the heart.

Side effects

Common side effects include:

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• Dry, persistent cough
• Dizziness or lightheadedness
• Fatigue or weakness
• Headache
• Nausea or stomach upset
• Elevated potassium levels
• Low blood pressure
• Skin rash

Serious side effects that require immediate medical attention:

• Angioedema (swelling of face, lips, tongue, or throat)
• Severe drop in blood pressure causing fainting
• Kidney problems or decreased urine output
• Severe allergic reactions
• Chest pain or irregular heartbeat

Warnings and precautions

• Pregnancy: Fosinopril is contraindicated during pregnancy, especially in the second and third trimesters, as it can cause serious harm or death to the developing fetus
• Kidney function: While fosinopril may be safer than other ACE inhibitors for patients with mild kidney problems, regular monitoring of kidney function and electrolyte levels is still necessary
• Angioedema risk: Patients with a history of angioedema or hereditary angioedema should not use fosinopril, as they have an increased risk of this potentially life-threatening reaction
• Surgery and anesthesia: Patients should inform their healthcare providers about fosinopril use before any surgical procedures, as it may interact with anesthesia
• Dehydration: Patients who are dehydrated, have low sodium levels, or are taking diuretics may be at increased risk for excessive blood pressure lowering

Interactions

Fosinopril can interact with several medications and supplements:

• Potassium supplements and salt substitutes: May cause dangerously high potassium levels when combined with fosinopril
• Diuretics: Can cause excessive blood pressure lowering, especially when starting treatment
• NSAIDs (ibuprofen, naproxen): May reduce the effectiveness of fosinopril and increase the risk of kidney problems
• Lithium: Fosinopril can increase lithium levels, potentially leading to lithium toxicity
• Diabetes medications: May enhance blood sugar-lowering effects, requiring dose adjustments
• Other blood pressure medications: Can cause additive blood pressure lowering effects
• Aliskiren: Should not be used together in patients with diabetes or kidney disease
• ARBs (angiotensin receptor blockers): Generally should not be combined due to increased risk of kidney problems and low blood pressure

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Dosage

For adults with high blood pressure, the typical starting dose is 10 mg once daily, which may be increased to 20-40 mg daily based on blood pressure response. For heart failure, treatment usually begins with 10 mg once daily, with gradual increases up to 40 mg daily as tolerated. Patients with kidney or liver problems may require lower doses. The medication can be taken with or without food, and it’s important to take it at the same time each day for consistent blood pressure control. Dosage adjustments should always be made under the supervision of a healthcare provider who will monitor blood pressure, kidney function, and electrolyte levels.

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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