ACE inhibitor

Some pills help people with heart problems. These pills help the tubes that carry blood. They make the tubes relax and open up. This helps the blood flow more easily.

When these tubes relax, blood pressure goes down. This means the heart does not work as hard. The heart can rest more.

These pills also help the kidneys. They can help people with diabetes. Some people use them after a kidney transplant too.

Some people might get a dry cough. This is a common side effect. Other people might feel dizzy or tired.

Doctors use these pills to keep people healthy. They are a very important tool.

ACE inhibitors are a type of medicine. Doctors use them to treat high blood pressure. They also help people with heart failure.

These drugs work by blocking a special enzyme. An enzyme is a part of the body that helps make changes. This specific enzyme is called ACE. Normally, ACE helps make a substance called angiotensin II. This substance makes blood vessels narrow. Narrow tubes make blood pressure go up. ACE inhibitors stop this from happening. This allows the blood vessels to relax and open wide. When vessels are relaxed, blood flows more easily. This helps the heart work less hard.

These medicines also change how the body handles bradykinin. Bradykinin is a substance that helps blood vessels open up. ACE inhibitors let more bradykinin stay in the body. This helps lower blood pressure even more.

Some people may feel side effects from these drugs. A common side effect is a dry cough. Some people might feel dizzy or tired. These drugs can also change the amount of potassium in the body. Doctors must watch these levels closely. These medicines are very important for kidney health too. They help people with diabetes and kidney disease.

ACE inhibitors are a special group of medicines. Doctors use them to treat high blood pressure and heart failure. They are also used for kidney diseases and heart attacks. Some people use them to help with problems after a kidney transplant. These drugs can even help people with schizophrenia who drink too much water. They work by changing how the body manages its blood pressure system. This system is called the renin-angiotensin-aldosterone system, or RAAS for short.

To understand how they work, we must look at a tiny worker called an enzyme. An enzyme is a part of the body that helps change one thing into another. This specific enzyme is called angiotensin-converting enzyme, or ACE. Normally, ACE turns a substance called angiotensin I into angiotensin II. Angiotensin II is a vasoconstrictor, which means it makes blood vessels narrow. When vessels narrow, blood pressure goes up. ACE inhibitors block this enzyme so that angiotensin II cannot form.

These medicines do more than just stop the narrowing of vessels. They also change how the body handles a substance called bradykinin. Usually, the ACE enzyme breaks bradykinin down. Because the medicine blocks the enzyme, more bradykinin stays in the body. Bradykinin is a vasodilator, which is a word for something that helps vessels open wide. The increase in bradykinin works together with the decrease in angiotensin II. This combination helps lower blood pressure effectively.

There are many different names for these medicines. Some common ones include captopril, enalapril, and lisinopril. Other names you might see are benazepril, zofenopril, perindopril, trandolapril, and ramipril. Doctors often choose these drugs first if a patient has diabetes. In 2012, a study in the BMJ showed these drugs might help reduce the risk of pneumonia. For people who had a stroke, the risk dropped by 54%. For those with heart failure, the risk dropped by 37%.

Even though these drugs help, they can cause side effects. A very common one is a dry cough. Some people might feel dizzy, tired, or have a headache. These drugs can also cause high potassium levels in the blood. This is called hyperkalemia, and it can make muscles feel weak. It is also very important that pregnant women do not take these medicines. They can cause serious health problems for a growing baby.

Angiotensin-converting-enzyme inhibitors, known as ACE inhibitors, are a vital class of medication. They primarily treat high blood pressure, also called hypertension, and heart failure. These drugs are also used for various cardiovascular and kidney diseases. They help manage conditions like acute myocardial infarction, which is a heart attack. They are also helpful for kidney complications caused by diabetes, known as diabetic nephropathy. By lowering blood pressure, they prevent injury to the kidneys.

To understand how these drugs work, we must look at the renin-angiotensin-aldosterone system, or RAAS. This is a major mechanism the body uses to regulate blood pressure. When the body detects low blood pressure or low sodium, the kidneys release an enzyme called renin. Renin acts on a protein from the liver to create angiotensin I. Then, the angiotensin-converting enzyme, or ACE, removes two residues from angiotensin I. This chemical reaction converts it into angiotensin II. Angiotensin II is a potent vasoconstrictor, meaning it causes blood vessels to narrow. This narrowing increases blood pressure and causes the body to retain salt and water.

ACE inhibitors interrupt this specific chemical chain. By blocking the ACE enzyme, these drugs prevent the formation of angiotensin II. This leads to the relaxation of blood vessels, which lowers arteriolar resistance. The drugs also increase the levels of a peptide called bradykinin. Normally, the ACE enzyme breaks down bradykinin. When the enzyme is inhibited, bradykinin levels rise. Bradykinin acts as a vasodilator, which helps blood vessels open wide. This dual action of decreasing a vasoconstrictor and increasing a vasodilator works synergistically to lower blood pressure.

There are several specific types of ACE inhibitors used in medicine. Common examples include captopril, enalapril, lisinopril, and perindopril. Other frequently prescribed versions are benazepril, zofenopril, trandolapril, and ramipril. Doctors often choose these as a first-line treatment, especially for patients with diabetes. In some cases, doctors may prescribe a fixed-dose combination. This might include an ACE inhibitor paired with a thiazide diuretic. These combinations help achieve the desired blood pressure improvements more effectively.

While these medicines are helpful, they can cause various side effects. A very common side effect is a persistent dry cough. This is believed to be linked to the increased levels of bradykinin in the body. Some patients, about 0.7%, may develop angioedema, which is a swelling caused by increased bradykinin. Another serious complication is hyperkalemia, or high potassium levels in the blood. This happens because suppressing angiotensin II also decreases levels of aldosterone. Since aldosterone helps the body excrete potassium, its decrease causes the body to retain it. High potassium can lead to muscle weakness or even cardiac dysfunction.

Medical research has uncovered surprising benefits for these drugs. A 2012 meta-analysis in the BMJ suggested ACE inhibitors might reduce pneumonia risk. For patients who previously had a stroke, the risk reduction was 54%. For those with heart failure, the risk reduction was 37%. In people of Asian descent, the risk reduction was 43% compared to 54% in non-Asian populations. Additionally, enalapril has been shown to help people with schizophrenia. It can decrease excessive water consumption, a condition called psychogenic polydipsia, in 60% of people. They are also used after kidney transplants to manage erythrocytosis, where hematocrit levels stay above 51%.

It is critical to note that ACE inhibitors are dangerous during pregnancy. They are classified as ADEC pregnancy category D. Taking them during the second or third trimester carries a boxed warning in the U.S. because they can cause birth defects. About half of newborns exposed to these drugs are adversely affected. This can include problems like renal dysplasia or pulmonary hypoplasia. Furthermore, patients with certain conditions, such as bilateral renal artery stenosis, should not take them. Doctors must closely monitor kidney function and potassium levels to ensure patient safety.