Prescription Icon Prescription Required
IMPORTANT NOTE: A valid Prescription is required to be mailed or faxed to complete this order. I acknowledge that I will need to be contacted to complete a health profile before my order is shipped.


Isoptin SR is an oral tablet made up of a calcium channel blocker called verapamil. We carry this medication in the brand choice and the generic alternative in 120mg, 180mg and 240mg. Isoptin SR is a sustained released medication!

Isoptin SR is a medication used for the treatment of high blood pressure. Blood pressure is the force of the blood against the walls of your blood vessels and when that force is high, it causes your heart to have to work harder which can cause damage. If hypertension goes treated for too long, a person risks health conditions such as heart attack, stroke, and kidney problems. Additionally, this medication may be used to prevent chest pain (angina), which may also help improve your ability to exercise while decreasing the frequency of angina attacks.

Isoptin SR (verapamil) is effective in treating hypertension and preventing angina because it is able to relax the blood vessels so blood can flow more easily while also controlling your heart rate.

Follow directions given to you by your health care professional.

Isoptin SR is most commonly taken 3 or 4 times a day, with or without food, as directed by your doctor. Your dose will be calculated based off your medical condition and response to treatment.

This medication must be used regularly to get the most benefit from it; ensure you do not miss a dose by taking the tablet at the same time every day. You may also use a pillbox to keep yourself from forgetting.

Do not stop taking Isoptin SR without first consulting your doctor. Some conditions may become worse if this medication is stopped suddenly.


Do not use Isoptin SR (verapamil)

You should not use this medication if you currently take colchicine, dofetilide, eliglustat, flibanserin, or lomitapide. Speak with your doctor about other medications that should not be used with Isoptin SR.

If you are allergic to verapamil, you will need to find an alternate medication; do not use Isoptin SR.

You should avoid using this medication until you have gone over all medical conditions you may have with your doctor first.

Dose adjustment or special precautions may be required

You need to tell your doctor before using Isoptin SR if you have heart failure (weak heart); certain types of abnormal heartbeats like heart block, Lown-Ganong-Levine syndrome, sick sinus syndrome, or Wolff-Parkinson-White syndrome; low blood pressure; or a slow heartbeat.


This medication may cause low blood pressure. If you notice signs of low blood pressure (see side effects), contact your doctor right away.

Be aware

This medication should only be used by a pregnant woman if the benefit outweighs the risk; consult your doctor if you are pregnant or plan on becoming pregnant.

This medication passes into breast milk and could harm a nursing infant.

Side Effects

Common side effects of Isoptin SR (verapamil) may include:

  • Dizziness
  • Headache
  • Constipation

The above side effects should not alarm you.

Serious side effects of Isoptin SR (verapamil) may include:

  • Slow heartbeat
  • An abnormal heartbeat that is new or worse
  • Very bad dizziness or passing out
  • Shortness of breath
  • Weight Gain 
  • Swelling in the arms or legs.

If you have any of the above side effects, contact your doctor right away.

Contact your doctor if you notice signs of…

allergic reaction – rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.

liver problems – dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.

low blood pressure – fatigue, lightheadedness, dizziness, nausea, clammy skin, depression, loss of consciousness, or blurry vision.


What not to take with Verapamil SR?


While taking Verapamil SR, you should avoid grapefruit and grapefruit juice as much as possible. As for what medications to avoid, that is possibly something you should bring up with your doctor, since they can give your further details.


What is Verapamil SR used for?


This medication is commonly used with or without other medications to treat high blood pressure. By taking this medication you can prevent the risk of stroke, heart attack, and kidney problems. It goes to work by relaxing the blood vessels so the blood can flow at a much easier pace. It may also be used to treat irregular heartbeats, angina, and other certain conditions where the heart muscle has become enlarged. This medication comes in three different strengths which are 120mg, 180mg, and 240mg. If you have any questions regarding this medication or any inquiries in general, feel free to give us a call at our toll free number 1-877-385-8998. 


How long does it take for Verapamil SR to work?


While this medication is known to be effective, it can take awhile to become fully effective. Once taken, it can take up to two weeks before you begin to receive the full benefit of this medication.


What are the side effects of Verapamil SR?


Some of the most common side effects to Isoptin SR are as follows; Dizziness, slow heartbeat, constipation, nausea, headache, tiredness, skin rash or itching, or flushing. Do keep in mind that these are just some of the side effects listed for this medication. And if any of these side effects persist or worsen, it is best then to speak with your doctor.

Call To Complete

Need Help?
Call Our CareTeam


Our CareTeam Member will guide you to complete your order