Skip to main content
The Globe and Mail
Support Quality Journalism
The Globe and Mail
First Access to Latest
Investment News
Collection of curated
e-books and guides
Inform your decisions via
Globe Investor Tools
Just$1.99
per week
for first 24 weeks

Enjoy unlimited digital access
Enjoy Unlimited Digital Access
Get full access to globeandmail.com
Just $1.99 per week for the first 24 weeks
Just $1.99 per week for the first 24 weeks
var select={root:".js-sub-pencil",control:".js-sub-pencil-control",open:"o-sub-pencil--open",closed:"o-sub-pencil--closed"},dom={},allowExpand=!0;function pencilInit(o){var e=arguments.length>1&&void 0!==arguments[1]&&arguments[1];select.root=o,dom.root=document.querySelector(select.root),dom.root&&(dom.control=document.querySelector(select.control),dom.control.addEventListener("click",onToggleClicked),setPanelState(e),window.addEventListener("scroll",onWindowScroll),dom.root.removeAttribute("hidden"))}function isPanelOpen(){return dom.root.classList.contains(select.open)}function setPanelState(o){dom.root.classList[o?"add":"remove"](select.open),dom.root.classList[o?"remove":"add"](select.closed),dom.control.setAttribute("aria-expanded",o)}function onToggleClicked(){var l=!isPanelOpen();setPanelState(l)}function onWindowScroll(){window.requestAnimationFrame(function() {var l=isPanelOpen(),n=0===(document.body.scrollTop||document.documentElement.scrollTop);n||l||!allowExpand?n&&l&&(allowExpand=!0,setPanelState(!1)):(allowExpand=!1,setPanelState(!0))});}pencilInit(".js-sub-pencil",!1); // via darwin-bg var slideIndex = 0; carousel(); function carousel() { var i; var x = document.getElementsByClassName("subs_valueprop"); for (i = 0; i < x.length; i++) { x[i].style.display = "none"; } slideIndex++; if (slideIndex> x.length) { slideIndex = 1; } x[slideIndex - 1].style.display = "block"; setTimeout(carousel, 2500); }
Coronavirus information
Coronavirus information
The Zero Canada Project provides resources to help you make the most of staying home.
Visit the hub

This Monday, April 6, 2020, file photo shows an arrangement of Hydroxychloroquine pills in Las Vegas.

John Locher/The Associated Press

The U.S. Food and Drug Administration on Friday warned doctors against prescribing a malaria drug touted by President Donald Trump for treating the new coronavirus except in hospitals and research studies.

In an alert, regulators flagged reports of sometimes fatal heart side effects among coronavirus patients taking hydroxychloroquine or the related drug chloroquine. The decades-old drugs, also prescribed for lupus and rheumatoid arthritis, can cause a number of side effects, including heart rhythm problems, severely low blood pressure and muscle or nerve damage.

The warning comes as doctors at a New York hospital published a report that heart rhythm abnormalities developed in most of 84 coronavirus patients treated with hydroxychloroquine and the antibiotic azithromycin, a combo Trump has promoted.

Story continues below advertisement

Both drugs are known to sometimes alter the heartbeat in dangerous ways, and their safety or ability to help people with COVID-19 is unknown. A National Institutes of Health experts panel earlier this week recommended against taking that drug combo except in a formal study because of the side effects potential.

Last month, the FDA authorized limited use of the malaria drugs for hospitalized patients with COVID-19 who aren’t enrolled in ongoing research. The FDA said the drugs’ risks are manageable when patients are carefully screened and monitored by doctors. A number of studies are testing hydroxychloroquine as a treatment or for prevention of COVID-19.

Regulators said they are now investigating dangerous side effects and deaths reported with the malaria drugs to poison control centres and other health authorities.

“It is important that health care providers are aware of the risks of serious and potentially life-threatening heart rhythm problems that can occur with these drugs,” the FDA said in a statement. The agency did not specify the number of reports it has received of side effects or deaths.

Calls to U.S. poison control centres about the malaria drugs increased last month to 79, compared to 52 in March 2019, according to Dr. Christopher Hoyte of the Rocky Mountain Poison Center in Denver, Colorado. The problems reported include abnormal heart rhythms, seizures, nausea and vomiting, Hoyte said.

Trump has repeatedly touted hydroxychloroquine during his regular coronavirus briefings, suggesting its skeptics would be proven wrong. He has offered patient testimonials that the drug is a lifesaver.

But a number of early coronavirus studies have suggested problems or no benefit.

Story continues below advertisement

In Friday’s report in the journal Nature Medicine, doctors at New York University and NYU Langone Health found a significant prolonging of what’s called the heart’s QT interval two to five days after coronavirus patients were given usual doses of hydroxychloroquine and azithromycin. The drugs can alter the QT interval, or the time it takes the heart to charge between beats. When that time is too long, it can trigger a rhythm problem that can lead to sudden death.

Nine of the 84 patients had severe prolongation of this interval. Four patients died from organ failure but there was no evidence heart problems contributed. Severe disease or other health problems may play a role in whether the heartbeat abnormality develops, the researchers speculated.

The results show how important it is that these drugs only be used in a study where patients are closely tracked, said one independent expert, Dr. Rais Vohra, an emergency medicine specialist at the Fresno branch of the University of California, San Francisco.

“That combination really sets you up for having a problem with the heart,” he said. “My colleagues and I are concerned. People are self-medicating and coming down with very predictable side effects on the heart.”

Another recent analysis involving 368 patients in U.S. veterans hospitals found no benefit from hydroxychloroquine — and more deaths. The report was not a rigorous test of the drug and results have not yet been reviewed by other scientists but are the largest so far of its use in COVID-19 patients.

Last month, the federal government accepted more than 30 million doses of hydroxychloroquine and chloroquine donated to the strategic national stockpile by drugmakers Sandoz and Bayer. The Federal Emergency Management Agency said Friday it has sent out more than 14 million doses of hydroxychloroquine to state and local health officials. Earlier this month the agency reported that it had sent 19 million doses. The agency didn’t explain the discrepancy between the two figures.

Story continues below advertisement

Accepting the donation required sign off by both the FDA and the Biomedical Advanced Research and Development Authority, or BARDA, a unit of HHS tasked with procuring treatments to combat bioterrorism and infectious diseases.

Earlier this week, former BARDA director, Rick Bright, said he was demoted from his job leading the agency because he resisted political pressure to allow widespread use of hydroxychloroquine. He has called for a federal investigation and reinstatement to his original job.

Report an error
Due to technical reasons, we have temporarily removed commenting from our articles. We hope to have this fixed soon. Thank you for your patience. If you are looking to give feedback on our new site, please send it along to feedback@globeandmail.com. If you want to write a letter to the editor, please forward to letters@globeandmail.com.

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff.

We aim to create a safe and valuable space for discussion and debate. That means:

  • Treat others as you wish to be treated
  • Criticize ideas, not people
  • Stay on topic
  • Avoid the use of toxic and offensive language
  • Flag bad behaviour

Comments that violate our community guidelines will be removed.

Read our community guidelines here

Discussion loading ...

To view this site properly, enable cookies in your browser. Read our privacy policy to learn more.
How to enable cookies