Lisinopril Drug Review: PTCB Exam Flashcard Guide

Lisinopril Overview for Pharmacy Technicians

Lisinopril is one of the most commonly prescribed medications in the United States and a staple on the PTCB exam. As a pharmacy technician, you will encounter lisinopril daily in both retail and hospital settings. This drug review covers everything you need to know for the Pharmacy Technician Certification Exam, which consists of 90 questions administered over 2 hours at Pearson VUE testing centers.

Brand Name and Classification

Lisinopril is sold under the brand names Prinivil and Zestril. It belongs to the ACE inhibitor (angiotensin-converting enzyme inhibitor) drug class. ACE inhibitors are identified by the suffix -pril, which is a high-yield PTCB exam tip. Other drugs in this class include enalapril (Vasotec), benazepril (Lotensin), and ramipril (Altace).

Mechanism of Action

Lisinopril works by blocking the angiotensin-converting enzyme, which prevents the conversion of angiotensin I to angiotensin II. Angiotensin II is a potent vasoconstrictor, so blocking its production leads to vasodilation and reduced blood pressure. ACE inhibitors also decrease aldosterone secretion, which reduces sodium and water retention.

Common Indications

Hypertension: First-line treatment for high blood pressure
Heart failure: Reduces mortality and hospitalizations
Diabetic nephropathy: Protects kidney function in diabetic patients
Post-myocardial infarction: Improves survival after heart attack

Dosing Information

Lisinopril is available in oral tablet form in strengths of 2.5 mg, 5 mg, 10 mg, 20 mg, 30 mg, and 40 mg. The typical starting dose for hypertension is 10 mg once daily, with a maximum dose of 80 mg daily. For heart failure, the starting dose is usually 2.5 to 5 mg once daily. Lisinopril is taken once daily regardless of meals, making it convenient for patients.

Side Effects to Know

The most commonly tested side effect of ACE inhibitors on the PTCB exam is a persistent dry cough. This occurs in approximately 10-15% of patients and is caused by the accumulation of bradykinin. Other important side effects include:

Hyperkalemia: Elevated potassium levels due to decreased aldosterone
Angioedema: Swelling of the face, lips, tongue, or throat, which is a medical emergency
Dizziness and hypotension: Especially with the first dose
Elevated serum creatinine: Monitor renal function

Drug Interactions

Key interactions that may appear on the PTCB exam include:

Potassium supplements and potassium-sparing diuretics: Risk of hyperkalemia
NSAIDs: May reduce the antihypertensive effect and increase renal risk
Lithium: ACE inhibitors can increase lithium levels
Aliskiren: Contraindicated combination in diabetic patients

PTCB Exam Tips

Remember these high-yield facts for exam day: ACE inhibitors end in -pril, the hallmark side effect is a dry cough, they are contraindicated in pregnancy (Category D), and patients should avoid potassium supplements unless directed by a physician. If a patient cannot tolerate the cough, they are typically switched to an ARB (angiotensin receptor blocker) such as losartan.

Ready to test your knowledge? Review our Top 200 Drugs flashcards or take a mini practice exam to reinforce what you have learned.