What is Verapamil?
Verapamil is a type of medication known as a calcium channel blocker. It comes under many brand names, such as Calan, Covera-HS and Isoptin. Because of the calcium blocking function, blood vessels are dilated, reducing blood pressure and the amount of oxygen your heart uses. It also reduces the risk of spasm in blood vessels. As you may guess, verapamil is commonly used to treat issues like high blood pressure and some other heart and circulatory related problems.
There are many types of calcium channel blockers used in the treatment of migraine. Verapamil is just one type. Verapamil is used as a preventative medication.
Many people are concerned about what calcium is being blocked by verapamil. This is calcium in the heart and smooth muscles. It has no impact on blood calcium or the calcium in your bones. So you don’t need to supplement your calcium specifically because you’re taking this medication. (In fact, taking calcium could interfere with verapamil – talk to your doctor)
Another concern people have is that verapamil will lower their blood pressure too low if they don’t already have high blood pressure. If your blood pressure is already normal or low, you usually don’t have to worry. However, do make sure your doctor is aware of your medical history, and if you start feeling very lightheaded when you stand up, that could be a sign that you should have your blood pressure checked.
Who takes Verapamil?
Verapamil actually has become an increasingly common medication for migraine of all classes. However, there are some conditions it’s more likely to be used:
- Cluster Headache (both chronic and episodic)
- Hemiplegic Migraine, including both sporadic hemiplegic migraine and familial hemiplegic migraine
- Migraineurs who already have high blood pressure
- Migraineurs who can’t take beta blockers (ie because of asthma)
- Menstrual Migraine
- Migraine induced by orgasm or exercise
- Types of migraine with prolonged aura
Verapamil has also been used successfully to treat children and adolescents with migraine.
Verapamil is a favourite in the class of calcium channel blockers, partly because it’s less likely to cause side effects. However, as with any medication, some people do experience some. Most commonly:
- Swelling of the feet, ankles or legs
- Slowing of the heart rate
- Tiredness or heaviness
- Light headedness (see above)
There are others, though these tend to be the most common – please talk to your doctor if you notice any side effects.
Though certainly not for everyone, verapamil continues to help some people with migraine and cluster as a preventative medication after many years of use.
Read more general information about Verapamil here.