Calan Sr is a calcium channel blocker which is used to treat high blood pressure (hypertension), to prevent chest pain (angina), and to control heart rate.
Calan Sr is called a calcium channel blocker. It works by relaxing blood vessels so blood can flow more easily. It is used with or without other medications to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Calan Sr is also used to prevent chest pain (angina). It is also used to control your heart rate if you have a fast or irregular heartbeat (such as atrial fibrillation).
Take Calan Sr exactly as prescribed by your doctor. The recommended starting dose for treating high blood pressure (hypertension) is 180 mg once daily in the morning. If necessary, your doctor may increase your dose to control your blood pressure. Up to 240 mg can be taken in a single dose once a day in the morning; higher doses should be split up and taken twice a day. The recommended starting dose for certain people (such as elderly people, or those with liver or kidney problems) is lower, 120 mg once daily in the morning. If you are being treated for high blood pressure, keep using this medication even if you feel fine. Take it at the same times each day.
Before taking Calan Sr you should talk with your doctor if you have kidney disease, kidney failure, liver disease, liver failure, cirrhosis, congestive heart failure, Duchenne's muscular dystrophy, Myasthenia gravis, low blood pressure, sick sinus syndrome, heart disease. This drug may make you dizzy. Do not drive or perform tasks that require alertness. Limit alcoholic beverages. Avoid eating grapefruit or drinking grapefruit juice while using this medication.
You should not take Calan Sr if you are allergic to it, verapamil hydrochloride, or any of the inactive components of the drug, are pregnant or breastfeeding, or if you have severe left ventricular dysfunction, sick sinus syndrome, heart block, low blood pressure (hypotension), Wolff-Parkinson-White syndrome, Lown-Ganong-Levine syndrome, heart attack, fluid in your lungs.
Possible side effect
Get emergency medical help if you have fast or slow heartbeats, nausea, fever, sore throat, headache, peeling, dizziness, stomach pain, red skin rash, rapid weight gain, difficulty breathing, loss of appetite, feeling short of breath, dark urine, yellowing of the skin or eyes (jaundice), constipation, itching, hives, swelling of your face, lips, tongue. If you notice other effects not listed above, contact your doctor.
Tell your doctor about all other medications you use, especially: carbamazepine, lithium, HIV or AIDS medicine (indinavir, atazanavir, fosamprenavir, ritonavir), phenobarbital, heart rhythm medications (quinidine, disopyramide, amiodarone), rifampin, beta-blockers (propranolol, bisoprolol, metoprolol, atenolol), digoxin, cyclosporine, antifungal medications (voriconazole, itraconazole, fluconazole, ketoconazole), antibiotics (clarithromycin, telithromycin, erythromycin), cimetidine, lovastatin, sedatives (triazolam, midazolam), theophylline, buspirone. Interaction between two medications does not always mean that you must stop taking one of them. Tell your doctor or prescriber about all prescription, over-the-counter, and herbal medications you are taking.
Take the missed dose as soon as possible. Skip the missed dose if it is time for your next scheduled dose. Don't take extra medicine to make up the missed dose.
If you think you have overdosed the medicine seek emergency medical help at once. The overdose symptoms are slow heartbeat, fainting, severe dizziness.
Store the medicine at room temperature between 59-77 degrees F (15-25 degrees C) away from light and moisture. Store it in a tight container. Keep all drugs away from reach of children and pets.
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