The FDA has approved a fixed-dose combination of the angiotensin receptor blocker (ARB) azilsartan and the thiazide-like diuretic chlorthalidone as Edarbyclor (Takeda) for treatment of hypertension

Effective treatment of hypertension can prevent organ damage and death. The choice of drugs for initial treatment continues to be controversial.

The angiotensin receptor blocker (ARB) azilsartan medoxomil (Edarbi – Takeda) was recently approved by the FDA for oral treatment of hypertension, either alone or combined with other drugs. It is the eighth ARB approved for this indication.

The importance of adequate control of hypertension in preventing organ damage and death is well established, but the choice of drugs is still controversial. Three recent drug trials, one supporting initial therapy with a diuretic, the second favoring an angiotensin converting enzyme (ACE) inhibitor, and the third showing equivalence between a calcium-channel blocker and an angiotensin-receptor blocker (ARB) have intensified the debate.

The FDA has required the addition of information about an increased risk of nonmelanoma skin cancer (basal cell carcinoma [BCC] and squamous cell carcinoma [SCC]) to the labels of products containing the diuretic hydrochlorothiazide.

The FDA has approved Byvalson (Allergan), a fixed-dose combination of the beta blocker nebivolol (Bystolic) and the angiotensin receptor blocker (ARB) valsartan (Diovan, and generics), for treatment of hypertension. It is the only combination product that contains nebivolol, and the first to combine a beta blocker with an ARB.

Recent advertisements for indapamide (Lozol - Rorer), an oral antihypertensive/diuretic (Medical Letter, 26:17, 1984), claim that the drug, unlike thiazide diuretics, does not significantly increase serum cholesterol and has a minimal impact on potassium. Indapamide has no thiazide ring but, like chlorthalidone (Hygroton; and others) and hydrochlorothiazide (HydroDiuril; and others), it does have a sulfamoyl benzamide moiety, which is probably responsible for its natriuretic and diuretic effects. Unlike the thiazides, it also has a methylindoline moiety, which apparently decreases...

Breaking drug tablets in half is a common practice. Since our last article on this subject, some new data have become available.

American College of Cardiology/American Heart Association (ACC/AHA) guidelines for treatment of hypertension were last published in 2018. Treatment of hypertensive urgencies and emergencies is not discussed here.

Microx (Pennwalt), a new low-dosage formulation of the thiazide-type diuretic metolazone (Zaroxolyn; Diulo), was recently marketed in the USA. The manufacturer claims that the low dose of controls hypertension with less potassium loss, making it safer than other diuretics and as effective as combination drugs, such as Dyazide, that include both a thiazide and a potassium-sparing diuretic. Medical Letter consultants generally do not recommend Dyazide or other fixed-dose combinations for treatment of hypertension.