Isoptin (Verapamil)

Strength(s): 40 mg ; 120 mg ; 240 mg

Active Ingredient: Verapamil



Isoptin is a medication that is used in the treatment of high blood pressure. This medication can be used with or without other medications. Lowered blood pressure reduces the risk of stroke, kidney problems and heart attacks. This medication belongs to a class called calcium channel blockers. The drug relaxes the blood vessels for easier flow of blood.

This medication is also used in preventing angina (chest pain) and control of the heart rate. Slowing down the heart rate helps in increasing the ability to exercise.

How to use Isoptin

Before taking this medication, read the Patient Information Leaflet that comes with the medication. In case of any questions, consult your doctor or pharmacy. This medication is taken orally by mouth, with or without food, usually 3-4 times daily or as directed by the doctor. The dosage to be taken is dependent on the response to treatment and the medical condition being treated.

When using this medication in the treatment of high blood pressure, you may have to wait for about a week before seeing the benefits. Continue with the medication even after feeling well to complete the dose.

To reduce the risk of side effect, the initial dose is low, and the doctor gradually increases it with time. Be sure to follow all the directions of the doctor. Talk to your doctor about any other medications you are using, including herbal products, prescription and non-prescription medication.

Take the medication as prescribed. This prevents chest pains. Also, this medication should not be used in the treatment of chest pains when they occur. For more details, consult your doctor. Do not stop this medication suddenly without consulting your doctor. Doing so could have adverse effects. Reduce the dose gradually.


Before taking this medication, inform your doctor if you are allergic to it. Also, discuss with your doctor other allergies including medication, food and other substances. This drug may contain inactive ingredients that may result in an allergic reaction or other problems. For more information, talk with your doctor or pharmacist.

Before taking this medication, discuss your medical history with your doctor especially heart failure, liver disease, kidney disease, certain muscle/nerve disorders.

When taking this medication, you may experience drowsiness, dizziness or blurred vision. Do not drive, operate machinery or carry out any activity that requires alertness until you are sure you can safely perform these activities. This medication may make you more sensitive to the sun. Use sunscreen or protective clothing while outdoors.

When pregnant, this medication should only be taken when clearly needed. Discuss the risks with your doctor before taking it. Also, consult your doctor before breastfeeding. This medication is known to pass into breast milk. Consult your doctor for the risks and benefits of this medication during this period.

Side Effects

Side effects of this medication include constipation, headache, tiredness, nausea. If these worsen or persist, seek medical assistance.

Rare but serious side effects include yellowing eyes/skin, severe abdominal pain. Dark urine and persistent vomiting.


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