Calan is a brand featuring verapamil hydrochloride as its active ingredient in tablet form. Verapamil hydrochloride acts as a calcium ion influx inhibitor, also known as a slow-channel blocker or calcium ion antagonist. It is available in oral tablets of 40 mg, 80 mg, or 120 mg strengths. Key inactive ingredients in the tablets include colloidal silicon dioxide, magnesium stearate, and microcrystalline cellulose.

How should I use this medication?

Take this medication by mouth. Take it as directed on the prescription label at the same time every day. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop.

Do not take this medication with grapefruit juice.

Talk to your care team about the use of this medication in children. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

Where should I keep my medication?

Keep out of the reach of children and pets.

Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Protect from light. Throw away any unused medication after the expiration date.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible:

• Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
• Heart failure—shortness of breath, swelling of the ankles, feet, or hands, sudden weight gain, unusual weakness or fatigue
• Slow heartbeat—dizziness, feeling faint or lightheaded, trouble breathing, unusual weakness or fatigue
• Liver injury—right upper belly pain, loss of appetite, nausea, light-colored stool, dark yellow or brown urine, yellowing skin or eyes, unusual weakness or fatigue
• Low blood pressure—dizziness, feeling faint or lightheaded, blurry vision

Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):

• Constipation
• Dizziness
• Headache
• Nausea

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions:

• Duchenne muscular dystrophy
• Heart disease
• Irregular heartbeat or rhythm
• Liver disease
• Low blood pressure
• An unusual or allergic reaction to verapamil, other medications, foods, dyes or preservatives
• Pregnant or trying to get pregnant
• Breast-feeding

What may interact with this medication?

Do not take this medication with any of the following:

• Cisapride
• Disopyramide
• Dofetilide
• Grapefruit juice
• Hawthorn
• Pimozide
• Red yeast rice

This medication may also interact with the following:

• Barbiturates such as phenobarbital
• Cimetidine
• Cyclosporine
• Lithium
• Local anesthetics or general anesthetics
• Medications for heart rhythm problems like amiodarone, digoxin, flecainide, procainamide, quinidine
• Medications for high blood pressure or heart problems
• Medications for seizures like carbamazepine and phenytoin
• Rifampin, rifabutin or rifapentine
• Theophylline or aminophylline

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Visit your care team for regular checks on your progress. Check your blood pressure as directed. Know what your blood pressure should be and when to contact your care team.

Do not treat yourself for coughs, colds, or pain while you are using this medication without asking your care team for advice. Some medications may increase your blood pressure.

This medication may affect your coordination, reaction time, or judgment. Do not drive or operate machinery until you know how this medication affects you. Sit up or stand slowly to reduce the risk of dizzy or fainting spells. Drinking alcohol with this medication can increase the risk of these side effects.