Product image of Isoptin (Verapamil Hydrochloride) supplied by GNH India

Isoptin

Active Ingredient:
Verapamil Hydrochloride
Origin:
EU

Isoptin (Verapamil Hydrochloride)

Verapamil, the active ingredient in Isoptin, is a calcium channel blocker presented as an oral dosage form for systemic use. It is employed to manage high blood pressure, relieve chest pain from angina, and control certain rapid heart rhythms in adult patients.
GNH India supplies Isoptin as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Viatris Healthcare Limited

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Indications & Clinical Uses

Isoptin (verapamil) acts on the cardiovascular system to modify calcium influx, which influences blood pressure and cardiac rhythm.

  • Hypertension: lowers systemic blood pressure by causing peripheral vasodilation.
  • Angina pectoris: reduces myocardial oxygen demand by decreasing heart rate and contractility, relieving chest pain.
  • Supraventricular tachyarrhythmias: slows atrioventricular‑node conduction, helping to restore normal heart rhythm in conditions such as atrial fibrillation or flutter.

How It Works

  • Verapamil blocks L‑type calcium channels in cardiac myocytes and vascular smooth muscle, decreasing intracellular calcium concentrations. This results in reduced myocardial contractility, slowed conduction through the atrioventricular node, and relaxation of arterial smooth muscle, producing antihypertensive, anti‑anginal, and antiarrhythmic effects.

Side Effects

Verapamil may cause a range of adverse reactions, from mild to severe.

Common Side Effects

  • Constipation: reduced gastrointestinal motility.
  • Dizziness or light‑headedness: related to blood pressure lowering.
  • Headache: often transient during initiation.
  • Peripheral edema: fluid accumulation in lower limbs.

Serious or Rare Side Effects

  • Bradycardia: markedly slowed heart rate requiring medical attention.
  • Hypotension: significant drop in blood pressure that can cause fainting.
  • AV‑block or other conduction disturbances: may necessitate discontinuation or pacing.

Precautions & Warnings

Before initiating verapamil therapy, clinicians should consider several safety measures.

  • Monitor blood pressure: ensure adequate control without excessive hypotension.
  • Assess cardiac function: evaluate for existing heart block or severe heart failure.
  • Use caution in patients with hepatic impairment: dose adjustments may be needed.
  • Avoid abrupt discontinuation: taper to prevent rebound hypertension or tachycardia.
  • Review concomitant medications: check for interactions that could amplify cardiac effects.
  • Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Avoid Interactions

Verapamil interacts with several drug classes, requiring careful management.

Major Interactions (Avoid)

  • Beta‑blockers: combined use can cause profound bradycardia or AV‑block.
  • Digoxin: verapamil raises digoxin serum levels, increasing toxicity risk.
  • Strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin): may markedly increase verapamil exposure.

Moderate Interactions (Monitor Closely)

  • CYP3A4 inducers (e.g., rifampin, carbamazepine): can reduce therapeutic effect.
  • Other antihypertensives (e.g., ACE inhibitors, diuretics): additive blood‑pressure lowering.
  • Lithium: verapamil may raise lithium concentrations, necessitating serum level monitoring.

Frequently Asked Questions

Isoptin, containing verapamil, is prescribed for high blood pressure, angina pectoris, and certain supraventricular tachyarrhythmias such as atrial fibrillation or flutter. It helps lower blood pressure, relieve chest pain, and control abnormal rapid heart rhythms by acting on calcium channels in the heart and blood vessels.

Verapamil blocks L‑type calcium channels in cardiac muscle and vascular smooth muscle. This reduces calcium entry into cells, leading to decreased heart muscle contractility, slowed conduction through the atrioventricular node, and relaxation of arterial walls, which together lower blood pressure, reduce heart workload, and stabilize heart rhythm.

The specific dose of Isoptin is determined by the prescribing clinician based on the individual’s medical condition, response to therapy, and other factors. Healthcare professionals tailor the dosage to achieve optimal blood‑pressure control, angina relief, or rhythm management while monitoring for safety.

Safety data for verapamil in pregnancy and lactation are limited. The medication should only be used if the potential benefit justifies any possible risk to the fetus or infant. Women who are pregnant, planning pregnancy, or breastfeeding should discuss alternatives and risks with their healthcare provider.

To place an order, submit an enquiry on the Isoptin product page at gnhindia.com, indicating the required quantity. GNH India works with hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details (including any cold‑chain requirements), and necessary import documentation.

Isoptin (verapamil) is a non‑dihydropyridine calcium‑channel blocker, distinguished by its pronounced effects on cardiac conduction and contractility. Compared with dihydropyridine agents such as amlodipine, verapamil more strongly reduces heart rate and AV‑node conduction, making it useful for rhythm control, whereas dihydropyridines primarily cause vasodilation with less impact on heart rate.

Isoptin should be stored at room temperature, below 25 °C. Keep the product in its original packaging, protect it from moisture and direct sunlight, and ensure the container is tightly closed to maintain stability throughout its shelf life.

Isoptin is taken orally, usually as a tablet, with or without food as directed by the prescriber. Patients should swallow the tablet whole with a full glass of water and follow the dosing schedule provided by their healthcare professional.

Serious risks include marked bradycardia, severe hypotension, and conduction disturbances such as AV‑block. These events may require immediate medical attention, dose adjustment, or discontinuation of therapy. Patients should be monitored for signs of these complications, especially during treatment initiation or dosage changes.

Isoptin is contraindicated in patients with severe sinus bradycardia, second‑ or third‑degree AV‑block without a pacemaker, sick sinus syndrome, or uncontrolled heart failure. Individuals with known hypersensitivity to verapamil or any component of the formulation should also avoid its use.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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