Lisinopril


Lisinopril is a medication of the angiotensin-converting enzyme inhibitor class used to treat high blood pressure, heart failure, and after heart attacks. For high blood pressure it is usually a first line treatment, although in black people calcium-channel blockers or thiazide diuretics work better. It is also used to prevent kidney problems in people with diabetes. Lisinopril is taken by mouth. Full effect may take up to four weeks to occur.
Common side effects include headache, dizziness, feeling tired, cough, nausea, and rash. Serious side effects may include low blood pressure, liver problems, high blood potassium, and angioedema. Use is not recommended during the entire duration of pregnancy as it may harm the baby. Lisinopril works by inhibiting the renin–angiotensin–aldosterone system.
Lisinopril was patented in 1978, and approved for medical use in the United States in 1987. It is available as a generic medication. In the United States the wholesale cost per month was less than US$0.70 as of 2018. In the United Kingdom it cost the NHS about ₤10 per month as of 2018. In 2017, it was the most commonly prescribed medication in the United States, with more than 104 million prescriptions.

Medical uses

Lisinopril is typically used for the treatment of high blood pressure, congestive heart failure, acute myocardial infarction, and diabetic nephropathy.
A review concluded that lisinopril was effective for treatment of proteinuric kidney disease, including diabetic proteinuria.

Kidney problems

The dose must be adjusted in those with poor kidney function. Dose adjustments may be required when creatinine clearance is less than or equal to 30mL/min. Since lisinopril is removed by dialysis, dosing changes must also be considered for people on dialysis.

Pregnancy and breastfeeding

Lisinopril has been assigned to pregnancy category D by the FDA. Animal and human data have revealed evidence of lethal harm to the embryo and teratogenicity associated with ACE inhibitors. No controlled data in human pregnancy are available. Birth defects have been associated with use of lisinopril in any trimester. However, there have been reports of death and increased toxicity to the fetus and newly born child with the use of lisinopril in the second and third trimesters. The label states, "When pregnancy is detected, discontinue Zestril as soon as possible." The manufacturer recommends mothers should not breastfeed while taking this medication because of the current lack of safety data.

Contraindications

Lisinopril is contraindicated in people who have a history of angioedema or who have diabetes and are taking aliskiren.

Adverse effects

The incidence of adverse effects varies according to which disease state the patient is being treated for.
People taking lisinopril for the treatment of hypertension may experience the following side effects:
People taking lisinopril for the treatment of myocardial infarction may experience the following side effects:
People taking lisinopril for the treatment of heart failure may experience the following side effects:

Overdose

In one reported overdose, the half-life of lisinopril was prolonged to 14.9 hours. The case report of the event estimates that the individual consumed between 420 and 500 mg of lisinopril and survived. In cases of overdosage, it can be removed from circulation by dialysis.

Interactions

Dental care

ACE-inhibitors like lisinopril are considered to be generally safe for people undergoing routine dental care, though the use of lisinopril prior to dental surgery is more controversial, with some dentists recommending discontinuation the morning of the procedure. People may present to dental care suspicious of an infected tooth, but the swelling around the mouth may be due to lisinopril-induced angioedema, prompting emergency, and medical referral.

Pharmacology

Lisinopril is the lysine-analog of enalapril. Unlike other ACE inhibitors, it is not a prodrug, is not metabolized by the liver, and is excreted unchanged in the urine.

Mechanism of action

Lisinopril is an ACE inhibitor, meaning it blocks the actions of angiotensin-converting enzyme in the renin–angiotensin–aldosterone system, preventing angiotensin I from being converted to angiotensin II. Angiotensin II is a potent direct vasoconstrictor and a stimulator of aldosterone release. Reduction in the amount of angiotensin II results in relaxation of the arterioles. Reduction in the amount of angiotensin II also reduces the release of aldosterone from the adrenal cortex, which allows the kidney to excrete sodium along with water into the urine, and increases retention of potassium ions. Specifically, this process occurs in the peritubular capillaries of the kidneys in response to a change in Starling forces. The inhibition of the RAAS system causes an overall decrease in blood pressure.

Pharmacokinetics

Absorption

Lisinopril has a poor bioavailability of ~25%. Its time to peak concentration is 7 hours. The peak effect of lisinopril is about 4 to 8 hours after administration. Food does not affect its absorption.

Distribution

Lisinopril does not bind to proteins in the blood. It does not distribute as well in people with NYHA Class II–IV heart failure.

Metabolism

Lisinopril is the only water-soluble member of the ACE inhibitor class, with no metabolism by the liver.

Elimination

Lisinopril leaves the body completely unchanged in the urine. The half-life of lisinopril is 12 hours, and is increased in people with kidney problems. While the plasma half-life of lisinopril has been estimated between 12–13 hours, the elimination half-life is much longer, at around 30 hours. The full duration of action is between 24 and 30 hours.

Chemistry

Pure lisinopril powder is white to off white in color. Lisinopril is soluble in water, less soluble in methanol, and virtually insoluble in ethanol.

History

, the first ACE inhibitor, is a functional and structural analog of a peptide derived from the venom of the jararaca, a Brazilian pit viper. Enalapril is a derivative, designed by scientists at Merck to overcome the rash and bad taste caused by captopril.
Enalapril is actually a prodrug; the active metabolite is enalaprilat.
Lisinopril is a synthetic peptide derivative of captopril. Scientists at Merck created lisinopril by systematically altering each structural unit of enalaprilat, substituting various amino acids. Adding lysine at one end of the drug turned out to have strong activity and had adequate bioavailability when given orally; analogs of that compound resulted in lisinopril, which takes its name from the discovery with lysine. Merck conducted clinical trials, and the drug was approved for hypertension in 1987 and congestive heart failure in 1993.
The discovery posed a problem, since sales of enalapril were strong for Merck, and the company did not want to diminish those sales. Merck ended up entering into an agreement with Zeneca under which Zeneca received the right to co-market lisinopril, and Merck received the exclusive rights to an earlier stage aldose reductase inhibitor drug candidate, a potential treatment for diabetes. Zeneca's marketing and brand name, "Zestril", turned out to be stronger than Merck's effort. The drug became a blockbuster for Astrazeneca, with annual sales in 1999 of $1.2B.
The US patents expired in 2002. Since then, lisinopril has been available under many brand names worldwide; some formulations include the diuretic hydrochlorothiazide.