Verapamil (Calan, Isoptin, Verelan) is in a class of drugs known as calcium channel blockers.

It is used to treat high blood pressure, fast heartbeats and to prevent migraine headaches.

It comes as a tablet, capsule, oral liquid, or injection.

  • Give this medicine only as told by the doctor and do not stop unless told to stop by your child's doctor.
  • Non-sustained release tablets can be taken with or without food. Take liquid or tablets with food if it causes an upset stomach.
  • Swallow long-acting products whole with food. Do not chew, break or crush. Sustained release capsules may be opened and sprinkled on soft food prior to taking.
  • Shake the liquid well before each dose.
  • Avoid grapefruit juice while taking this medication. Grapefruit juice could increase the amount of verapamil in your blood.
  • Ask the doctor or pharmacist before giving any other drugs, over-the-counter (OTC) medicines, or herbal medications.
  • Do not use after the expiration date on the bottle.
  • If too much medicine is taken by accident, call the Drug and Poison Information Center (DPIC), 513-636-5111 or 1-800-222-1222, or call your child's doctor right away.
  • Keep this medication out of the reach of children.

For any medication information related to your child's dosing schedule and/or missed doses, contact the healthcare provider who prescribed the medication. 

Call your child's doctor if the following effects continue or are bothersome:

  • Feeling dizzy
  • Feeling tired
  • Constipation
  • Stomach upset

Call your child's doctor immediately if your child has:

  • Severe dizziness or passes out
  • Severe headache
  • Chest pains
  • Any rash

Last Updated 11/2013