We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |

Calcium blockers for heart disease: two approved, more to come

JAMA. 1982;247(14):1911-1917. doi:10.1001/jama.1982.03320390005003.
Text Size: A A A
Published online


Calcium-entry blockers, a class of drugs that increase the heart's blood supply by reducing the spontaneous constriction of cardiac and arterial muscle cells, are finally becoming available for the struggle against heart disease.

The Food and Drug Administration has now approved two of these agents, nifedipine and verapamil, for use orally in the treatment of angina pectoris. One other, diltiazem hydrochloride, is expected to receive FDA approval soon for the same purpose. All three drugs have been used for years in other countries (JAMA [MEDICAL NEWS] 1981;245:807/X 816). The intravenous (IV) form of verapamil was approved in August 1981 for the treatment of some arrhythmias.

Calcium-entry blockers interfere with the mechanism of smooth muscle contraction in the arterial walls. This contraction process is triggered by the entrance of extracellular calcium ions into the muscle cells. The drugs thus can be expected to prevent angina attacks in which arterial spasm plays


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?




Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.