Corzide Side Effects Center

Last updated on RxList: 11/9/2021
Corzide Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

What Is Corzide?

Corzide (nadolol and bendroflumethiazide) is a combination beta-blocker and diuretic used to treat high blood pressure (hypertension). Corzide is available in generic form.

What Are Side Effects of Corzide?

Common side effects of Corzide include:

  • dizziness
  • spinning sensation
  • lightheadedness
  • slow heartbeat
  • tiredness
  • nausea
  • vomiting
  • diarrhea
  • constipation
  • upset stomach
  • blurred vision
  • depression
  • ringing in your ears, and
  • decreased sexual ability

Dosage for Corzide

Dosing of Corzide is individualized. The initial dose of Corzide may be 40 mg/5 mg tablet once daily.

What Drugs, Substances, or Supplements Interact with Corzide?

Corzide may interact with narcotics, barbiturates, amphotericin B, blood thinners, calcium supplements, colestipol, cholestyramine, diazoxide, digoxin, gout medications, insulin or oral diabetes medicines, lithium, MAO inhibitors, steroids, other heart or blood pressure medications, or NSAIDs (nonsteroidal anti-inflammatory drugs). Tell your doctor all medications and supplements you use.

Corzide During Pregnancy or Breastfeeding

During pregnancy, Corzide should be used only if prescribed. It may harm a fetus. This medication passes into breast milk. Nadolol may have undesirable effects on a nursing infant. Consult your doctor before breastfeeding.

Additional Information

Our Corzide (nadolol and bendroflumethiazide) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • fast, slow, or uneven heartbeat;
  • numbness or cold feeling in your hands and feet;
  • a light-headed feeling, like you might pass out;
  • little or no urination; or
  • signs of an electrolyte imbalance--dry mouth, increased thirst, mood changes, confusion, vomiting, muscle pain or weakness, lack of energy, fast heartbeats, little or no urine.

Common side effects may include:

  • dizziness; or
  • feeling tired.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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Corzide Professional Information



Most adverse effects have been mild and transient and have rarely required withdrawal of therapy.

Cardiovascular - Bradycardia with heart rates of less than 60 beats per minute occurs commonly, and heart rates below 40 beats per minute and/or symptomatic bradycardia were seen in about 2 of 100 patients. Symptoms of peripheral vascular insufficiency, usually of the Raynaud type, have occurred in approximately 2 of 100 patients. Cardiac failure, hypotension, and rhythm/conduction disturbances have each occurred in about 1 of 100 patients. Single instances of first degree and third degree heart block have been reported; intensification of AV block is a known effect of beta-blockers (see also CONTRAINDICATIONS, WARNINGS AND PRECAUTIONS).

Central Nervous System - Dizziness or fatigue has been reported in approximately 2 of 100 patients; paresthesias, sedation, and change in behavior have each been reported in approximately 6 of 1000 patients.

Respiratory - Bronchospasm has been reported in approximately 1 of 1000 patients (see CONTRAINDICATIONS and WARNINGS).

Gastrointestinal - Nausea, diarrhea, abdominal discomfort, constipation, vomiting, indigestion, anorexia, bloating, and flatulence have been reported in 1 to 5 of 1000 patients.

Miscellaneous - Each of the following has been reported in 1 to 5 of 1000 patients: rash; pruritus; headache; dry mouth, eyes, or skin; impotence or decreased libido; facial swelling; weight gain; slurred speech; cough; nasal stuffiness; sweating; tinnitus; blurred vision. Reversible alopecia has been reported infrequently.

The following adverse reactions have been reported in patients taking nadolol and/or other beta adrenergic blocking agents, but no causal relationship to nadolol has been established.

Central Nervous System - Reversible mental depression progressing to catatonia; visual disturbances; hallucinations; an acute reversible syndrome characterized by disorientation for time and place, short-term memory loss, emotional lability with slightly clouded sensorium, and decreased performance on neuropsychometrics.

Gastrointestinal - Mesenteric arterial thrombosis; ischemic colitis; elevated liver enzymes.

Hematologic - Agranulocytosis; thrombocytopenic or nonthrombocytopenic purpura.

Allergic - Fever combined with aching and sore throat; laryngospasm; respiratory distress.

Miscellaneous - Pemphigoid rash; hypertensive reaction in patients with pheochromocytoma; sleep disturbances; Peyronie's disease.

The oculomucocutaneous syndrome associated with the beta-blocker practolol has not been reported with nadolol.


Gastrointestinal - Nausea, vomiting, cramping and anorexia are not uncommon; diarrhea, constipation, gastric irritation, abdominal bloating, jaundice (intrahepatic cholestatic jaundice), hepatitis, and sialadenitis occasionally occur; and pancreatitis has been reported.

Central Nervous System - Dizziness, vertigo, paresthesia, headache, and xanthopsia occasionally occur.

Hematologic - Leukopenia, agranulocytosis, thrombocytopenia, hemolytic anemia, and aplastic anemia have been reported.

Dermatologic-Hypersensitivity - Purpura, exfoliative dermatitis, pruritus, ecchymosis, urticaria, necrotizing angiitis (vasculitis, cutaneous vasculitis), respiratory distress including pneumonitis, fever, and anaphylactic reactions occasionally occur; photosensitivity and rash have been reported.

Cardiovascular - Orthostatic hypotension may occur and may be potentiated by coadministration with certain other drugs (e.g., alcohol, barbiturates, narcotics, other antihypertensive medications, etc.; see PRECAUTIONS, DRUG INTERACTIONS).

Other - Muscle spasm, weakness, or restlessness is not uncommon; hyperglycemia, glycosuria, metabolic acidosis in diabetic patients, hyperuricemia, allergic glomerulonephritis, and transient blurred vision occasionally occur.

Whenever adverse reactions are moderate or severe, thiazide dosage should be reduced or therapy withdrawn.



When administered concurrently the following drugs may interact with beta-adrenergic receptor blocking agents:

Anesthetics, general - exaggeration of the hypotension induced by general anesthetics (see WARNINGS, Nadolol, Major Surgery).

Antidiabetic drugs (oral agents and insulin) - hypoglycemia or hyperglycemia; adjust dosage of antidiabetic drug accordingly (see WARNINGS, Nadolol, Diabetes and Hypoglycemia).

Catecholamine-depleting drugs (e.g., reserpine) - additive effect; monitor closely for evidence of hypotension and/or excessive bradycardia (e.g., vertigo, syncope, postural hypotension).

Digitalis glycosides - Both digitalis glycosides and beta-blockers slow atrioventricular conduction and decrease heart rate. Concomitant use can increase the risk of bradycardia.

Response to Treatment for Anaphylactic Reaction - While taking beta-blockers, patients with a history of severe anaphylactic reaction to a variety of allergens may be more reactive to repeated challenge, either accidental, diagnostic, or therapeutic. Such patients may be unresponsive to the usual doses of epinephrine used to treat allergic reaction.


When administered concurrently the following drugs may interact with thiazide diuretics:

Alcohol, barbiturates, or narcotics - potentiation of orthostatic hypotension may occur.

Amphotericin B, corticosteroids, or corticotropin (ACTH) - may intensify electrolyte imbalance, particularly hypokalemia. Monitor potassium levels; use potassium replacements if necessary.

Anticoagulants (oral) - dosage adjustments of anticoagulant medication may be necessary since bendroflumethiazide may decrease their effects.

Antigout medications - dosage adjustments of antigout medication may be necessary since bendroflumethiazide may raise the level of blood uric acid.

Other antihypertensive medications (e.g., ganglionic or peripheral adrenergic blocking agents) - dosage adjustments may be necessary since bendroflumethiazide may potentiate their effects.

Antidiabetic drugs (oral agents and insulin) - since thiazides may elevate blood glucose levels, dosage adjustments of antidiabetic agents may be necessary.

Calcium salts - increased serum calcium levels due to decreased excretion may occur. If calcium must be prescribed monitor serum calcium levels and adjust calcium dosage accordingly.

Cardiac glycosides - enhanced possibility of digitalis toxicity associated with hypokalemia. Monitor potassium levels; use potassium replacement if necessary.

Cholestyramine resin and colestipol HCl - may delay or decrease absorption of bendroflumethiazide. Sulfonamide diuretics should be taken at least one hour before or four to six hours after these medications.

Diazoxide - enhanced hyperglycemic, hyperuricemic, and antihypertensive effects. Be cognizant of possible interaction; monitor blood glucose and serum uric acid levels.

Lithium salts - may enhance lithium toxicity due to reduced renal clearance. Avoid concurrent use; if lithium must be prescribed monitor serum lithium levels and adjust lithium dosage accordingly. (See WARNINGS.)

MAO inhibitors - dosage adjustments of one or both agents may be necessary since hypotensive effects are enhanced.

Nondepolarizing muscle relaxants, preanesthetics and anesthetics used in surgery (e.g., tubocurarine chloride and gallamine triethiodide) - effects of these agents may be potentiated; dosage adjustments may be required. Monitor and correct any fluid and electrolyte imbalances prior to surgery if feasible.

Nonsteroidal anti-inflammatory agents - in some patients, the administration of a nonsteroidal anti-inflammatory agent can reduce the diuretic, natriuretic, and antihypertensive effect of loop, potassium-sparing or thiazide diuretics. Therefore, when bendroflumethiazide and nonsteroidal anti-inflammatory agents are used concomitantly, the patient should be observed closely to determine if the desired effect of the diuretic is obtained.

Methenamine - possible decreased effectiveness due to alkalinization of the urine. Pressor amines (e.g., norepinephrine) - decreased arterial responsiveness, but not sufficient to preclude effectiveness of the pressor agent for therapeutic use. Use caution in patients taking both medications who undergo surgery. Administer preanesthetic and anesthetic agents in reduced dosage, and if possible, discontinue bendroflumethiazide one week prior to surgery.

Probenecid or sulfinpyrazone - increased dosage of these agents may be necessary since bendroflumethiazide may have hyperuricemic effects.

Drug/Laboratory Test Interactions

Bendroflumethiazide may produce false-negative results with the phentolamine and tyramine tests; may interfere with the phenolsulfonphthalein test due to decreased excretion; and it may cause diagnostic interference of serum electrolyte levels, blood and urine glucose levels, and a decrease in serum PBI levels without signs of thyroid disturbance.

Read the entire FDA prescribing information for Corzide (Nadolol and Bendroflumethiazide)

© Corzide Patient Information is supplied by Cerner Multum, Inc. and Corzide Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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