Isoptin SR

Generic Name: Verapamil

  • What is Isoptin SR?

    Isoptin SR belongs to a class of medications called calcium channel blockers; it is used to treat high blood pressure.

  • What is the most important information I should know about Isoptin SR?

    It is important to let your doctor know if you have any heart conditions or heartbeat irregularities before starting this medication.

    Be sure to follow up with your doctor regularly to monitor your liver function. If you already have liver problems, tell your doctor so he or she may determine if the dose of Isoptin SR is appropriate for you.

  • Who should not take Isoptin SR?

    Do not take Isoptin SR if you have low blood pressure; sick sinus syndrome (abnormal heart rhythm) or a heart block (unless you have a pacemaker); or other abnormal heart rhythms.

    Do not take Isoptin SR if you are allergic to it or any of its ingredients.

  • What should I tell my doctor before I take the first dose of Isoptin SR?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Isoptin SR. Also, talk to your doctor about your complete medical history, especially if you have low blood pressure, heart problems, kidney disease, liver disease, myasthenia gravis (loss of muscular control), or Duchenne's muscular dystrophy (inherited disorder that causes muscle weakness).

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Adults: The usual starting dose is 180 milligrams (mg) once a day in the morning. Your doctor will adjust your dose as needed until the desired effect is achieved.

  • How should I take Isoptin SR?

    Take Isoptin SR exactly as prescribed by your doctor. Take this medication with food.

  • What should I avoid while taking Isoptin SR?

    Do not drink alcohol while you are taking Isoptin SR. This medication may increase the effects of alcohol.

    Do not breastfeed while you are taking Isoptin SR.

  • What are possible food and drug interactions associated with Isoptin SR?

    If Isoptin SR is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Isoptin SR with the following: alcohol, aspirin, blood pressure medications (such as lisinopril or metoprolol), carbamazepine, cimetidine, clonidine, cyclosporine, digoxin, erythromycin, grapefruit juice, lithium, medications for life-threatening irregular heartbeats (such as disopyramide), nitrates (such as nitroglycerin), phenobarbital, rifampin, ritonavir, telithromycin, or theophylline.

  • What are the possible side effects of Isoptin SR?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Side effects may include: constipation, difficulty breathing, dizziness, headache, heart problems, low blood pressure, nausea, rash, slow heart rate, swelling, tiredness

  • Can I receive Isoptin SR if I am pregnant or breastfeeding?

    The effects of Isoptin SR during pregnancy are unknown. Isoptin SR may cause harm to your baby if you use it during breastfeeding. Do not breastfeed while you are taking Isoptin SR. Tell your doctor immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Isoptin SR?

    If you miss a dose of Isoptin SR, take it as soon as you remember. However, if it is almost time for your next dose, skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

  • How should I store Isoptin SR?

    Store at room temperature.