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Drug Name:


Generic Name and Formulations:
Losartan potassium, hydrochlorothiazide; 50mg/12.5mg, 100mg/12.5mg, 100mg/25mg; tabs.

Merck & Co., Inc.

e-Prescribe this drug via Surescripts

Therapeutic Use:

Indications for HYZAAR:

Hypertension (not for initial therapy unless HTN is severe). To reduce stroke in hypertensive patients with left ventricular hypertrophy (LVH); this benefit may not apply to black patients.

Adult Dose for HYZAAR:

≥18yrs: One 50–12.5mg tab once daily; may increase after about 3 weeks (2–4 weeks for severe HTN) to two 50–12.5mg tabs once daily or one 100–25mg tab once daily. Titrate components: see full labeling. HTN with LVH: switch from losartan monotherapy (see full labeling). Severe renal impairment (CrCl<30mL/min): not recommended.

Children's Dose for HYZAAR:

<18yrs: not established.

Pharmacological Class:

Angiotensin II receptor blocker + diuretic.


Anuria. Sulfonamide allergy. Concomitant aliskiren in patients with diabetes.


Fetal toxicity; discontinue as soon as pregnancy is detected. Correct salt/volume depletion before starting therapy, or reduce initial dose. Renal impairment: monitor for worsening renal function. Hepatic impairment. Severe CHF. Renal artery stenosis. Asthma. SLE. Gout. Diabetes. Postsympathectomy. Acute myopia. Secondary angle-closure glaucoma. Pregnancy (Cat.C in 1st trimester, Cat.D in 2nd and 3rd trimesters). Nursing mothers: not recommended.


See Contraindications. Hyperkalemia with K+ supplements, K+ sparing diuretics, K+ containing salt substitutes. May be antagonized by, and renal toxicity potentiated by NSAIDs, including selective COX-2 inhibitors (monitor renal function periodically in elderly and/or volume-depleted). Dual inhibition of the renin-angiotensin system with ARBs, ACEIs, or aliskiren may increase risk of hypotension, hyperkalemia, renal function changes; monitor closely. Concomitant aliskiren in renal impairment (CrCl <60mL/min): not recommended. Orthostatic hypotension with alcohol, other CNS depressants. Potentiates other antihypertensives, tubocurarine. Hypokalemia with corticosteroids, ACTH. May antagonize pressor amines (eg, norepinephrine). Adjust antihyperglycemics. May increase digitalis, lithium toxicity (monitor). May interfere with parathyroid tests.

Adverse Reactions:

Dizziness, abdominal pain, palpitations, back pain, sinusitis, cough, upper respiratory infection, rash, hyperkalemia; angioedema, syncope (discontinue if occurs), rhabdomyolysis (rare).


Hepatic (CYP2C9, 3A4).


Fecal, renal.

Generic Availability:


How Supplied:

Tabs—30, 90, 1000

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