ACE inhibitors and ARBs are two closely related blood pressure medication classes that affect the renin-angiotensin-aldosterone system. You will see them often in retail and hospital pharmacy practice, so knowing their suffixes, risks, and monitoring needs is essential.
What Are ACE Inhibitors and ARBs?
ACE inhibitors end in -pril—lisinopril, enalapril, ramipril—and block angiotensin-converting enzyme, reducing angiotensin II formation. ARBs end in -sartan—losartan, valsartan, candesartan—and block angiotensin II at AT1 receptors. Both lower blood pressure and are used in heart failure, chronic kidney disease with proteinuria, and post-MI care. Key counseling points include pregnancy avoidance, hyperkalemia, hypotension, and renal function changes. ACE inhibitors can cause dry cough and angioedema; ARBs have less cough but still carry angioedema and pregnancy warnings. Neither class is a DEA-controlled substance.
Why ACE Inhibitors and ARBs Matter for Pharmacy Technicians
For the PTCB exam, you need to recognize generics by suffix, match common adverse effects, and understand monitoring. In practice, you help catch duplicate therapy, verify allergies, and relay pharmacist counseling. Both classes require potassium and serum creatinine monitoring, especially after initiation or dose changes. Pregnancy is a major safety issue: patients should notify the prescriber if pregnant or planning pregnancy.
Practical Application With ACE Inhibitors and ARBs
A patient on lisinopril 10 mg daily calls about a persistent dry cough. You should not tell them to stop or switch; document the concern and notify the pharmacist. The prescriber may change to an ARB such as losartan, but that is a prescriber decision—not an automatic technician substitution. Also check for potassium supplements, salt substitutes, NSAIDs, and duplicate RAAS therapy.
Common Mistake and Pro Tip for ACE Inhibitors and ARBs
⚠️ A common mistake is assuming an ARB is interchangeable with an ACE inhibitor or that using both together is routine. 💡 Pro tip: use the suffixes -pril and -sartan for quick recognition, and always flag potassium or creatinine concerns to the pharmacist.
Quick Reference: ACE Inhibitors and ARBs
- ACE inhibitors: generic suffix -pril (lisinopril, enalapril)
- ARBs: generic suffix -sartan (losartan, valsartan)
- Shared risks: hyperkalemia, hypotension, renal changes, pregnancy risk
- ACE inhibitor-specific: dry cough, angioedema
- Technician action: verify, document, and refer clinical questions
Related Concepts
Review Renin-Angiotensin-Aldosterone System (RAAS), Hyperkalemia, and Angioedema to strengthen medication safety knowledge.