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Calan Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Calan (verapamil hydrochloride) is a calcium channel blocker used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders. Calan is available in generic form. Common side effects of Calan include dizziness, slow heartbeat, constipation, nausea, headache, tiredness, skin rash or itching, or warmth, itching, redness, or tingly feeling under your skin.
The usual dose of Calan to treat angina is 80 mg to 120 mg three times a day. The dosage to treat arrhythmias ranges from 240 to 480 mg/day divided into three or four daily doses. The usual initial dosage to treat hypertension is 80 mg three times a day (240 mg/day). Calan may interact with other blood pressure medications, buspirone, carbamazepine, cimetidine, cyclosporine, digoxin, lithium, lovastatin, phenobarbital, rifampin, theophylline, sedatives, antibiotics, antifungals, beta-blockers, heart rhythm medications, or HIV/AIDS medicine. Tell your doctor all medications you use. During pregnancy Calan should be used only when prescribed. This medication passes into breast milk but it is unlikely to harm a nursing infant. Consult your doctor before breast-feeding.
Our Calan (verapamil hydrochloride) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Calan in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- fast or slow heartbeats;
- feeling like you might pass out;
- fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;
- restless muscle movements in your eyes, tongue, jaw, or neck;
- feeling short of breath, even with mild exertion;
- swelling, rapid weight gain; or
- nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Less serious side effects may include:
- constipation, nausea;
- skin rash or itching;
- dizziness, headache, tired feeling; or
- warmth, itching, redness, or tingly feeling under your skin.
Read the entire detailed patient monograph for Calan (Verapamil HCl)
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Calan Overview - Patient Information: Side Effects
To lower your risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious side effects occur: swelling ankles/feet, shortness of breath, unusual tiredness, unexplained/sudden weight gain, severe dizziness, fainting, very slow heartbeat.
Tell your doctor immediately if any of these rare but very serious side effects occur: severe stomach/abdominal pain, dark urine, yellowing eyes/skin, persistent nausea/vomiting.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Calan (Verapamil HCl)
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Calan FDA Prescribing Information: Side Effects
Serious adverse reactions are uncommon when CALAN therapy is initiated with upward dose titration within the recommended single and total daily dose. See WARNINGS for discussion of heart failure, hypotension, elevated liver enzymes, AV block, and rapid ventricular response. Reversible (upon discontinuation of verapamil) non-obstructive, paralytic ileus has been infrequently reported in association with the use of verapamil. The following reactions to orally administered verapamil occurred at rates greater than 1.0% or occurred at lower rates but appeared clearly drug-related in clinical trials in 4,954 patients:
|CHF, Pulmonary edema||1.8%|
|Bradycardia (HR < 50/min)||1.4%|
|AV block total (1°, 2°, 3°)||1.2%|
|2° and 3°||0.8%|
|Elevated liver enzymes (see WARNINGS)|
In clinical trials related to the control of ventricular response in digitalized patients who had atrial fibrillation or flutter, ventricular rates below 50 at rest occurred in 15% of patients and asymptomatic hypotension occurred in 5% of patients.
The following reactions, reported in 1.0% or less of patients, occurred under conditions (open trials, marketing experience) where a causal relationship is uncertain; they are listed to alert the physician to a possible relationship:
Hemic and lymphatic: ecchymosis or bruising.
Special senses: blurred vision, tinnitus.
Treatment Of Acute Cardiovascular Adverse Reactions
The frequency of cardiovascular adverse reactions that require therapy is rare; hence, experience with their treatment is limited. Whenever severe hypotension or complete AV block occurs following oral administration of verapamil, the appropriate emergency measures should be applied immediately; eg, intravenously administered norepinephrine bitartrate, atropine sulfate, isoproterenol HCl (all in the usual doses), or calcium gluconate (10% solution). In patients with hypertrophic cardiomyopathy (IHSS), alpha-adrenergic agents (phenylephrine HCl, metaraminol bitartrate, or methoxamine HCl) should be used to maintain blood pressure, and isoproterenol and norepinephrine should be avoided. If further support is necessary, dopamine HCl or dobutamine HCl may be administered. Actual treatment and dosage should depend on the severity of the clinical situation and the judgment and experience of the treating physician.
Read the entire FDA prescribing information for Calan (Verapamil HCl)
Additional Calan Information
Calan - User Reviews
Calan User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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