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CALCIUM CHANNEL BLOCKER
| The Calan brand name has been discontinued in the U.S. for reasons unrelated to safety or efficacy. Other brand names or generic alternatives may be available. If you’re currently taking this medication, talk to your healthcare provider about safe options for transitioning to a different treatment. |
Overview
Calan was a prescription drug approved by the U.S. Food and Drug Administration (FDA) to treat hypertension, angina, and arrhythmias. Calan was prescribed off-label to prevent migraine attacks. Calan was also known by its drug name, verapamil.
Calan was a calcium channel blocker. Calcium channel blockers are believed to work by suppressing the action of serotonin, which constricts blood vessels in the head and lowers pain tolerance.
How was it taken?
Calan was generally taken three or four times a day. Calan came in tablet form.
Side effects
The FDA-approved label for Calan listed common side effects including headache, dizziness, fatigue, rash, itching, tingling sensation under the skin, nausea, and constipation.
Rare but serious side effects listed for Calan included heart failure, liver damage, low blood pressure, and bradycardia (slowed heartbeat).
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