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Related to metolazone: Torsemide


Metenix (UK), Zaroxolyn

Pharmacologic class: Thiazide-like diuretic

Therapeutic class: Diuretic, antihypertensive

Pregnancy risk category B


Inhibits electrolyte reabsorption from ascending loop of Henle and decreases reabsorption of sodium and potassium in distal renal tubules, increasing plasma osmotic pressure and promoting diuresis


Tablets: 2.5 mg, 5 mg, 10 mg

Indications and dosages


Adult: 2.5 to 5 mg P.O. daily.

Edema caused by heart failure or renal disease

Adults: 5 to 20 mg P.O. daily


• Hypersensitivity to drug

• Hepatic coma or precoma

• Anuria


Use cautiously in:

• severe hepatic or renal impairment, gout, hyperparathyroidism, glucose tolerance abnormalities, fluid or electrolyte imbalances, bipolar disorders

• elderly patients

• pregnant or breastfeeding patients

• children (safety not established).


• Give in morning to avoid frequent nighttime urination.

• Discontinue drug before parathyroid function tests are performed.

• Be aware that metolazone is the only thiazide-like diuretic that may cause diuresis in patients with glomerular filtration rates below 20 ml/minute.

Adverse reactions

CNS: drowsiness, lethargy, vertigo, paresthesia, weakness, headache, fatigue

CV: chest pain, hypotension, palpitations, venous thrombosis, arrhythmias

GI: nausea, vomiting, bloating, cramping, anorexia, pancreatitis

GU: polyuria, nocturia, erectile dysfunction, decreased libido

Hematologic: aplastic anemia, leukopenia, agranulocytosis

Hepatic: hepatitis

Metabolic: dehydration, hypercalcemia, hypomagnesemia, hyponatremia, hypophosphatemia, hypovolemia, hyperglycemia, hyperuricemia, hypokalemia, hypochloremic alkalosis

Musculoskeletal: muscle cramps

Skin: photosensitivity, rashes

Other: chills


Drug-drug. Amphotericin B, corticosteroids, mezlocillin, piperacillin, ticarcillin: additive hypokalemia

Antigout drugs: increased uric acid level

Antihypertensives, nitrates: additive hypotension

Digoxin: increased risk of digoxin toxicity

Lithium: decreased lithium excretion, increased risk of lithium toxicity

Drug-diagnostic tests. Bilirubin, calcium, cholesterol, creatinine, low-density lipoproteins, triglycerides, uric acid: increased levels

Blood glucose, urine glucose: increased levels in diabetic patients

Magnesium, potassium, protein-bound iodine, sodium, urinary calcium: decreased levels

Drug-food. Any food: increased metolazone absorption

Drug-herbs. Aloe, cascara sagrada, senna: increased risk of hypokalemia

Drug-behaviors. Sun exposure: increased risk of photosensitivity

Patient monitoring

• Monitor baseline and periodic electrolyte, blood urea nitrogen, glucose, and uric acid levels.

• Evaluate blood pressure regularly.

Watch for signs and symptoms of hypokalemia, which may necessitate potassium supplements, potassium-rich diet, or potassium-sparing diuretic. Hypokalemia is particularly dangerous to patients who are on digitalis or have had ventricular arrhythmias.

• Assess patient for fluid and electrolyte imbalances.

Patient teaching

• Advise patient to take in morning to avoid frequent nighttime urination.

• Tell patient he may take with food or milk to prevent GI upset.

Instruct patient to report muscle pain, weakness, or cramps; nausea; vomiting; diarrhea; dizziness; restlessness; excessive thirst; fatigue; drowsiness; increased pulse; or irregular heart beats.

• Inform patient that drug may cause gout attacks. Advise him to report sudden joint pain.

• Instruct patient to use sunscreen and protective clothing to avoid photosensitivity.

• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, foods, herbs, and behaviors mentioned above.

McGraw-Hill Nurse's Drug Handbook, 7th Ed. Copyright © 2013 by The McGraw-Hill Companies, Inc. All rights reserved


A diuretic drug similar to the thiazide group used to treat high blood pressure (HYPERTENSION). A brand name is Metenix.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
4: Frequency of Individual Anti-Hypertensives Prescribed in Patients with CKD Amlodipine 51 Metoprolol 45 Torsemide 28 Clonidine 24 Clinidipine 18 Prazocin 18 Furosemide 15 Atenolol 13 Metolazone 12 Nifedipine 7 Enalapril 3 Note: Table made from bar graph.
Hospital Day 2: Metolazone, 5mg po BID, was added to the above medications in an attempt to increase diuresis, but was unsuccessful.
Another diuretic, metolazone (Mykrox, Zaroxolyn), may provide an alternative, since it significantly increases diuresis while raising calcium levels, Dr.
His usual medications consisted of metformin 1 g bd, digoxin 0.125 mg od, bisoprolol 2.5 mg od, bumetanide 2 mg bd, Symbicort 2 puffs bd, citalopram 10 mg od and metolazone prn for resistant oedema.
Fifth, two patients in the control group were on low-dose metolazone (a diuretic) possibly influencing the results.
The class of antihypertensive drugs known as thiazides or thiazide-like diuretics include chlorthalidone (Clorpres[R]), chlorothiazide (Diuril[R]), hydrochlorothiazide (HydroDIURIL[R], Microzide[R]), metolazone (Zaroxolyn[R], Mykrox[R]), and polythiazide (Renese[R]).
Patients received 1 or more of the following: furosemide, bumetanide, metolazone, and hydrochlorothiazide.
metolazone (Zaroxolyn) spironolactone (Aldactone) Lowers blood pressure, but holds on to potassium.
Diuretics: chlorthalidone, hydrochlorothiazide, indapamide, metolazone
Some commonly used diuretics are hydrochlorothiazide (Esidrix, Hydro-DIURIL), metolazone (Zaroxolyn, Mykrox), chlorthalidone (Hygroton) and furosemide (Lasix).
If a patient does develop resistance to a high dose of loop diuretic, the addition of a thiazide (hydrochlorothiazide) or thiazide-like (metolazone) diuretic (1 hour before administration of the loop diuretic) often results in a remarkable synergistic effect.
Inadequate diuretic response may indicate the need to increase the dose of the loop diuretic, to add a second diuretic (such as metolazone, chlorothiazide, or spironolactone) to the loop diuretic, or to consider continuous infusion of the loop diuretic.