What is quinapril? What is quinapril used for?
Quinapril belongs in a class of drugs called angiotensin converting enzyme (ACE) inhibitors. ACE inhibitors are used for treating high blood pressure and heart failure and for preventing kidney failure due to high blood pressure and diabetes.
Other drugs in this class are enalapril (Vasotec), ramipril (Altace), captopril (Capoten), fosinopril (Monopril), benazepril (Lotensin), lisinopril (Zestril, Prinivil), moexipril (Univasc) and trandolapril (Mavik). ACE is important because it produces angiotensin II. Angiotensin II contracts the muscles of the arteries in the heart and the rest of the body, narrowing the arteries and thereby elevating blood pressure. In the kidney, the narrowing caused by angiotensin II decreases blood flow and increases the arterial filtration pressure in the kidney. ACE inhibitors such as quinapril lower blood pressure by inhibiting the formation of angiotensin II, thereby relaxing the arterial muscles and enlarging the arteries. This increases the flow of blood and oxygen to the heart so that it can pump blood more efficiently.
The enlargement of the arteries elsewhere in the body also makes it easier for the heart to pump blood. This is particularly beneficial when there is heart failure. In the kidneys ACE inhibitors increase blood flow and reduce the filtration pressure in the kidneys.
Quinapril was approved by the FDA in November 1991.
What brand names are available for quinapril?
Is quinapril available as a generic drug?
Do I need a prescription for quinapril?
What are the side effects of quinapril?
Quinapril is generally well tolerated, and side effects are
usually mild and transient. A dry, persistent cough has been reported with the
use of quinapril and other ACE inhibitors. Coughing resolves after discontinuing
Other side effects include:
- abdominal pain,
- loss of taste,
- loss of appetite,
- nausea, vomiting,
- fainting, and
- numbness or
tingling in the hands or
Quinapril and other ACE inhibitors
may also cause kidney failure and increased levels of potassium in the blood.
The most serious but very rare side effects are
liver failure and angioedema
(swelling of lips and throat).
Salt and sodium are the same.
What is the dosage for quinapril?
The recommended dose for treating high blood pressure is 10-80 mg a
day as a single dose or in two doses every 12 hours. Start at 5 to 20 mg daily.
The initial dose for heart failure is 5 mg every 12 hours and the maintenance
dose is 20 to 40 mg a day as a single dose or in two divided doses every 12 hours. Quinapril should be taken on an empty stomach because food reduces its
Which drugs or supplements interact with quinapril?
: The use of ACE inhibitors with potassium supplements, salt
substitutes or diuretics (for example,
[Aldactone]) that increase potassium in the blood may lead to excessive
potassium levels in the body. Potassium levels should be closely monitored
whenever ace inhibitors are use in combination with these drugs.
Patients receiving diuretics or are dehydrated or have low blood sodium may
experience excessive reduction in blood pressure when quinapril is started.
Stopping the diuretic or increasing salt intake prior to taking quinapril may
prevent this excessive reduction in blood pressure.
There have been reports that aspirin and other
Combining quinapril or other ACE inhibitors with non-steroidal
anti-inflammatory drugs (NSAIDs) in patients who are elderly, volume-depleted
(including those on diuretic therapy), or with poor kidney function may result
in reduced kidney function, including kidney failure. These effects usually are
Nitritoid reactions (symptoms include facial flushing, nausea, vomiting and
hypotension) may occur when injectable gold (sodium aurothiomalate), used in the
treatment of rheumatoid arthritis, is combined with ACE inhibitors, including
Quinapril should not be combined with aliskiren (Tekturna) because the
combination of both drugs increases blockade of angiotensin leading to low blood
pressure, increased blood potassium, and possible kidney damage.
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Is quinapril safe to take if I’m pregnant or breastfeeding?
Angiotensin converting enzyme inhibitors, including quinapril, are
very harmful to the fetus and, therefore, should not be used
What else should I know about quinapril?
What preparations of quinapril are available?
Tablets: 5, 10, 20 and 40 mg
How should I keep quinapril stored?
Tablets and solutions should be stored at room temperature 15 C to 30 C (59 F to 86 F).