Overview
Calan is a prescription drug approved by the Food and Drug Administration (FDA) to treat hypertension, angina, and arrhythmias. Calan may be prescribed off-label to prevent migraines. Calan is also known by its drug name, Verapamil.

Calan is 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 do I take it?
Calan is generally taken three or four times a day.

Calan comes in tablet form.

Side effects
The FDA-approved label for Calan lists common side effects including headache, dizziness, fatigue, rash, itching, tingling sensation under the skin, nausea, and constipation.... read more

Rare but serious side effects listed for Calan include heart failure, liver damage, low blood pressure, and bradycardia (slowed heartbeat).

For more details about this treatment, visit:
Calan – RxList
http://www.rxlist.com/calan-drug.htm

Calcium Channel Blockers to prevent migraine headaches – Migraine.com
https://migraine.com/migraine-treatment/calcium...

Calan (Verapamil) Questions

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