Safe but ‘not benign’
Nilanjana Bose, MD, MBA, a rheumatologist at the Rheumatology Center of Houston, said she uses hydroxychloroquine “all the time” in clinical practice to treat patients with rheumatic conditions.
“I cannot comment on whether it [hydroxychloroquine or chloroquine] is a potential prophylactic or treatment for COVID-19, but I can say that, from a safety point of view, as a rheumatologist who uses hydroxychloroquine at a dose of 400 mg/day, I do not think we need to worry about serious [psychiatric] side effects,” Dr. Bose said in an interview.
Because clinicians are trying all types of possible treatments for COVID-19, “if this medication has possible efficacy, it is a great medicine from a rheumatologic perspective and is safe,” she added.
Nevertheless, the drug is “not benign, and regular side effects will be there, and of course, higher doses will cause more side effects,” said Dr. Bose, who was not involved in authoring the letter.
She counsels patients about potential psychiatric side effects of hydroxychloroquine because some of her patients have complained about irritability, worsening anxiety and depression, and difficulty sleeping.
Be wary
James “Jimmy” Potash, MD, MPH, Henry Phipps Professor of Psychiatry and Behavioral Sciences, Johns Hopkins Medicine, Baltimore, said in an interview that the “take-home message of this letter is that serious psychiatric effects, psychotic illness in particular,” can occur in individuals who take chloroquine and hydroxychloroquine.
In addition, “these are potentially very concerning side effects that psychiatrists should be aware of,” noted Dr. Potash, department director and psychiatrist-in-chief at Johns Hopkins.
He said that one of his patients who had been “completely psychiatrically healthy” took chloroquine prophylactically prior to traveling overseas. After she began taking the drug, she had an episode of mania that resolved once she discontinued the medication and received treatment for the mania.
“If you add potential psychiatric side effects to the other side effects that can result from these medications, that adds up to a pretty important reason to be wary of taking them, particularly for the indication of COVID-19, where the level of evidence that it helps in any way is still quite weak,” Dr. Potash said.
In an interview, Remington Nevin, MD, MPH, DrPH, executive director at the Quinism Foundation, White River Junction, Vt., a nonprofit organization that supports and promotes education and research on disorders caused by poisoning by quinoline drugs; and faculty associate in the department of mental health at Johns Hopkins Bloomberg School of Public Health, said that the authors of the letter “are to be commended for their efforts in raising awareness of the potentially lasting and disabling psychiatric effects of chloroquine and hydroxychloroquine, which, as with similar effects from other synthetic quinoline antimalarials, have occasionally been overlooked or misattributed to other conditions.”
He added: “I have proposed that the chronic neuropsychiatric effects of this class of drug are best considered not as side effects but as signs and symptoms of a disorder known as chronic quinoline encephalopathy caused by poisoning of the central nervous system.”
Dr. Gressier and the other letter authors, Dr. Bose, and Dr. Potash have reported no relevant financial relationships. Dr. Nevin has been retained as a consultant and expert witness in legal cases involving claims of adverse effects from quinoline antimalarial drugs.
A version of this article originally appeared on Medscape.com.