The QT interval is a section of the electrocardiogram (ECG or EKG), and having a QT interval that is too long can be dangerous. If you already have a long QT interval (if you have long QT syndrome), you probably need to avoid medications that prolong the QT interval.

There are drugs which are documented to increase the risk of long QT syndrome which should be avoided. We prospectively assessed whether intravenous ciprofloxacin prolongs the QT interval in patients with additional co-morbidities and risk factors. List of Drugs to be Avoided by Patients with Congenital Long QT Syndrome (LQTS)* updated July 2013 *This list is not comprehensive but is meant to be a practical list for those clinicians managing patients with LQTS in Canada. Website and information provided and produced  by Cardiac Risk in the Young– a charity that supports people that have suffered a loss from young sudden cardiac death & also young people who have been diagnosed with a condition.For people with LQTS there are specific medications that can have a serious effect by further prolonging the QT interval. This condition may be acquired or genetic. Screening for potential drug interactions and electrolyte abnormalities may also help …

However, in a … Long QT intervals are recognized to be either congenital or acquired, in the latter case frequently associated with drug administration.

Generic Name Brand Name. Drugs that have QT-prolonging effects should not exceed recommended dosing range, as drug-induced arrhythmia is often a result of high drug concentrations. If medication is causing long QT syndrome, your medication will be reviewed and an alternative may be prescribed. There is a problem in the ion regulation in the heart which leads to arrhythmia. (See Etiology, Prognosis, Presentation, and Workup. Select one or more newsletters to continue. Our articles are resourced from reputable online pages. In addition, these medications should be prescribed with caution in patients who have underlying risk factors, such as cardiac disorders. There are certain medications which interfere with the ion regulation and promote arrhythmia and increase the incidences of long QT syndrome.

A similar list can also be found by Neither of these lists should be considered exhaustive, and you should always check with your GP and pharmacist if your doctor prescribes any new drugs for you, as these lists may not be complete. This article may contains scientific references.

Thus, the patients who are at risk should consult with the medical professional before initiation any therapy.long QT syndrome may be genetic i.e. Antihistamines – terfenadine and astemizole have been withdrawn from the market because of this risk. Long QT Syndrome (LQTS) is an abnormal cardiac condition in which there is prolonged QT interval as compared to normal interval. About Long QT Syndrome: Long QT Syndrome is a rare heart rhythm disorder that may lead to palpitations, fainting, seizures or sudden death.This disorder is characterized by a prolongation of the QT interval on electrocardiogram which increases the risk of ventricular tachycardia. The patients who have the high risk for developing LQTS should refrain from using these medications and should not initiate any therapy before consulting the medical professional.This article on has been reviewed by a medical professional, as well as checked for facts, to assure the readers the best possible accuracy.We follow a strict editorial policy and we have a zero-tolerance policy regarding any level of plagiarism.

We comply with the HONcode standard for trustworthy health information - In severe cases and prolonged arrhythmia, the probability of death is too high. Thus, the patients at risk should take advice from the healthcare professionals even while taking over-the-counter drugs.The patients with long QT syndrome should be very careful about the drugs being administered as there are various drugs which carry the risk of causing or aggravating long QT syndrome. In most instances, however, the stimulus cannot be identified. Therefore, all forms of sympathetic provocation should be avoided. Intravenous administration of ciprofloxacin in patients with additional risks may elevate the risk of QTc interval prolongation. Available for Android and iOS devices. If you already have a long QT interval (if you have long QT syndrome), you probably need to avoid medications that prolong the QT interval. Telithromycin should also be avoided in patients with congenital long QT syndrome. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records.