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diltiazem hydrochloride

Adizem (UK), Angitil (UK), Apo-Diltiaz (CA), Apo-Diltiazem (CA), Calcicard (UK), Cardizem, Cardizem CD, Cardizem LA, Cartia XT, Dilacor-XR, Dilcardia (UK), Dilt-CD, Dilt-XR, Diltia XT, Diltzac, Dilzem (UK), Disogram (UK), Gen-Diltiazem (CA), Med-Diltiazem (CA), Novo-Diltazem (CA), Nu-Diltiaz (CA), Optil (UK), Ratio-Diltiazem (CA), Sandoz Diltiazem (CA), Slozem (UK), Taztia XT, Tiazac, Tildiem (UK), Viazem (UK), Zemtard (UK)

Pharmacologic class: Calcium channel blocker

Therapeutic class: Antianginal, antiarrhythmic (class IV), antihypertensive

Pregnancy risk category C


Inhibits calcium from entering myocardial and vascular smooth-muscle cells, thereby depressing myocardial and smooth-muscle contraction and decreasing impulse formation and conduction velocity. As a result, systolic and diastolic pressures decrease.


Capsules (extended-release, sustained-release): 60 mg, 90 mg, 120 mg, 180 mg, 240 mg, 300 mg, 360 mg, 420 mg

Injection: 5 mg/ml in 10-ml vials, 100-mg Monovial

Tablets: 30 mg, 60 mg, 90 mg, 120 mg

Indications and dosages

Angina pectoris and vasospastic (Prinzmetal's) angina; hypertension; supraventricular tachyarrhythmias; atrial flutter or fibrillation

Adults: 30 to 90 mg P.O. three to four times daily (tablets), or 60 to 120 mg P.O. b.i.d. (sustained-release), or 180 to 240 mg P.O. once daily (extended-release), adjusted after 14 days as needed, up to a total daily dosage of 360 mg. Or 0.25 mg/kg by I.V. bolus over 2 minutes; if response is inadequate after 15 minutes, may give 0.35 mg/kg over 2 minutes; may follow with continuous I.V. infusion at 10 mg/hour (at a range of 5 to 15 mg/hour) for up to 24 hours.

Dosage adjustment

• Severe hepatic or renal impairment

• Elderly patients

Off-label uses

• Unstable angina, coronary artery bypass graft surgery

• Tardive dyskinesia

• Migraine

• Hyperthyroidism

• Raynaud's phenomenon


• Hypersensitivity to drug

• Atrial flutter or fibrillation associated with shortened refractory period (Wolff-Parkinson-White syndrome, with I.V. use)

• Recent myocardial infarction or pulmonary congestion

• Cardiogenic shock, concurrent I.V. beta-blocker therapy, ventricular tachycardia, neonates (with I.V. use, because of benzyl alcohol in syringe formulation)

• Sick sinus syndrome, second- or third-degree atrioventricular block (except in patients with ventricular pacemakers)

• Hypotension (systolic pressure below 90 mm Hg)


Use cautiously in:

• severe hepatic or renal impairment, heart failure

• history of serious ventricular arrhythmias

• concurrent use of I.V. diltiazem and I.V. beta blockers

• elderly patients

• pregnant or breastfeeding patients

• children (safety not established).


• When giving I.V., dilute in dextrose 5% in water or normal saline solution.

• Give I.V. bolus dose over 2 minutes; a second bolus may be given after 15 minutes.

• Administer continuous I.V. infusion at a rate of 5 to 15 mg/hour.

When giving by continuous I.V. infusion, make sure emergency equipment is available and that patient has continuous ECG monitoring with frequent blood pressure monitoring.

• Don't crush tablets or sustained-release capsules; they must be swallowed whole.

• Withhold dose if systolic blood pressure falls below 90 mm Hg, diastolic pressure is below 60 mm Hg, or apical pulse is slower than 60 beats/minute.

Adverse reactions

CNS: headache, abnormal dreams, anxiety, confusion, dizziness, drowsiness, nervousness, psychiatric disturbances, asthenia, paresthesia, syncope, tremor

CV: peripheral edema, bradycardia, chest pain, hypotension, palpitations, tachycardia, arrhythmias, heart failure

EENT: blurred vision, tinnitus, epistaxis

GI: nausea, vomiting, diarrhea, constipation, dyspepsia, dry mouth

GU: urinary frequency, dysuria, nocturia, polyuria, gynecomastia, sexual dysfunction

Hematologic: anemia, leukopenia, thrombocytopenia

Metabolic: hyperglycemia

Musculoskeletal: joint stiffness, muscle cramps

Respiratory: cough, dyspnea

Skin: rash, dermatitis, flushing, diaphoresis, photosensitivity, pruritus, urticaria, erythema multiforme

Other: unpleasant taste, gingival hyperplasia, weight gain, decreased appetite, Stevens-Johnson syndrome


Drug-drug. Beta-adrenergic blockers, digoxin, disopyramide, phenytoin: bradycardia, conduction defects, heart failure

Carbamazepine, cyclosporine, quinidine: decreased diltiazem metabolism, increased risk of toxicity

Cimetidine, ranitidine: increased blood level and effects of diltiazem

Fentanyl, nitrates, other antihypertensives, quinidine: additive hypotension

HMG-CoA reductase inhibitors, imipramine, sirolimus, tacrolimus: increased blood levels of these drugs

Lithium: decreased lithium blood level, reduced antimanic control

Nonsteroidal anti-inflammatory drugs: decreased antihypertensive effect of diltiazem

Theophylline: increased theophylline effects

Drug-diagnostic tests. Hepatic enzymes: increased levels

Drug-food. Grapefruit juice: increased blood level and effects of diltiazem

Drug-behaviors. Acute alcohol ingestion: additive hypotension

Patient monitoring

• Check blood pressure and ECG before starting therapy, and monitor closely during dosage adjustment period. Withhold dose if systolic pressure is below 90 mm Hg.

Monitor for signs and symptoms of heart failure and worsening arrhythmias.

• Supervise patient during ambulation.

Patient teaching

• Instruct patient to swallow extended-release capsules whole and not to crush or chew them.

• Advise patient to change position slowly to minimize light-headedness and dizziness.

• Caution patient to avoid driving and other hazardous activities until he knows how drug affects concentration and alertness.

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

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


A trademark for the drug diltiazem hydrochloride.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Diltiazem, see there.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The settlement agreement was struck nine days after the FDA gave partial approval to Andrx's ANDA for marking a generic version of Cardizem, (137) with full approval to be given upon the expiration of the thirty-month waiting period or upon a declaration of non-infringement in the Paragraph IV litigation.
However, in both Andrx and Cardizem, the reverse-payment settlements were unusually broad.
products were not available in Canada (e.g., Cardizem CD 360 mg, Dilt-CD), and some Canadian products were not distributed in the United States (e.g., Rhotral, Parsitan).
Watson intends to launch its generic version of Cardizem LA immediately.
would not market its generic version of Cardizem CD until either (1)
Andrx agreed not to market a bioequivalent or generic version of Cardizem (even those not at issue in the litigation) in the United States until it obtained a favorable, unappealable determination that the patent was not infringed.
Q: I am taking Cardizem and Coumadin for atrial fibrillation.
For example, Sismondi describes a US research study by Biovail that paid a fee of $1000 for doctors, plus $150 for office management expenses, for patient data when at least 11 of their patients renewed a prescription to Cardizem, a drug intended for long-term use.
He prescribed Cardizem to lower Lida's blood pressure, and admitted her to the hospital for observation in the cardiac-care unit.
In addition, if combined with Sustiva, the following drugs may require a change in the dose of either Sustiva or the other medicine: Ritadin (ritampin); Sporanox (itraconazole); Nizoral (ketoconazole); calcium-channel blockers (for example, Cardizem, Tiazac, and others); and the cholesterol-lowering medications Lipitor (atorvastatin), Pravachol (pravastatin), and Zocor (simvastatin).
Common calcium channel blockers include: verapamil (Calan, Isoptin), nifedipine (Procardia, Adalat) and diltiazem (Cardizem).