Here is a quick and easy guide to improve your understanding of the five most common drugs, used by the majority of patients.
- The most commonly used drug is hydrochlorothiazide or HCTZ (which is used by 22 percent of hypertension patients, according to QuintilesIMS). It’s a diuretic, which causes the kidneys to increase urination. This results in a lower volume of fluid in the bloodstream, which reduces blood pressure. It or its cousin drug, chlorthalidone, are preferred first drugs because they work well for most patients.
- Equally common is lisinopril, a drug in the angiotensin converting enzyme inhibitor (ACEI) family (most end in “-pril”). It interferes with a chemical signal in the body that would otherwise increase blood pressure.
- Amlodipine, which is used by 17 percent of hypertension patients, is a calcium channel blocker. It lowers blood pressure by partially preventing calcium from traveling into cells, which prevents blood vessels from narrowing and raising blood pressure.
- A drug class closely related to ACEIs are angiotensin receptor blockers or ARBs, which interfere with the same chain of reactions as ACEIs. The most commonly used ARB, losartan, is taken by 10 percent of patients. Usually, ACEIs are prescribed first because of their well-established record, but are replaced by ARBs if side effects occur.
- Unlike the other classes, beta blockers are not a great blood pressure drug for everyone. They work best for people with heart disease because they slow the heart rate and reduce blood pressure. Metoprolol, used by 8 percent of hypertension patients, is the leading beta-blocker (most end in “-olol”).
Let’s revisit Margaret, who was introduced in a previous post: She is a 53-year-old with high blood pressure. When first treated, she was prescribed the drug lisinopril, which blocks the tightening of blood vessels. Even with gradual dosage increases, her blood pressure remained too high. Her increasing weight made her hypertension harder to treat. Her physician then added a second medication, amlodipine, which relaxes blood vessels. Her blood pressure was controlled for a time, although she had some side effects, including ankle swelling. At her last visit, Margaret’s blood pressure was up again and her doctor was considering adding a third, new drug, hydrochlorothiazide (HCTZ).