Zestril is the brand name for the antihypertensive medication lisinopril. It belongs to the class of angiotensin converting enzyme inhibitors. The drug works by blocking the enzyme that converts angiotensin i to angiotensin ii, a potent vasoconstrictor. By reducing angiotensin ii levels the medication promotes relaxation of blood vessel walls. This vasodilation lowers peripheral resistance and decreases arterial blood pressure. The resulting reduction in afterload also improves cardiac output in patients with heart failure. The physiological effect is a sustained decrease in systemic vascular resistance and blood pressure.

Zestril is the commercial name for the drug lisinopril which belongs to the class of angiotensin converting enzyme inhibitors. This medication is primarily prescribed to manage hypertension and to improve survival in patients with heart failure. The pharmacological action of lisinopril involves blocking the conversion of angiotensin i to angiotensin ii thereby reducing vasoconstriction. By inhibiting this enzyme the drug decreases the production of a hormone that normally raises blood pressure. The resulting relaxation of blood vessels leads to a lowering of systemic vascular resistance and a reduction in arterial pressure. In addition to its effect on blood vessels lisinopril dampens the activation of the renin angiotensin aldosterone system which further contributes to its antihypertensive effect. The modulation of hormonal pathways also helps to protect the kidneys from damage associated with chronic hypertension. Overall the medication's ability to interfere with angiotensin ii formation creates a balanced physiological response that supports cardiovascular health.

The most common side effects often include headache, nausea, and mild fatigue. These reactions are typically short-lived and vary by individual. They are generally linked to dosage and personal sensitivity. Headache frequency tends to decrease after the first few days. Nausea may be mitigated by taking the medication with food. Mild fatigue is reported more often in the early stages of treatment. Most individuals experience these effects without serious complications.

The most common side effects often include mild drowsiness. Some people may experience a temporary headache as the body adjusts. Nausea can occur, especially when the medication is taken on an empty stomach. A dry sensation in the mouth is frequently reported by users. Occasional mild fever may accompany the treatment in a small number of cases. Feelings of fatigue are commonly noted during the first few days. Muscle aches sometimes appear, reflecting the body's response to the medication. Mild gastrointestinal discomfort can also be observed in certain individuals.