Two people suffering from symptoms of COVID-19 long after the typical disease time frame, have reported an almost full recovery after taking daily doses of over-the-counter antihistamines.
Antihistamines, drugs commonly used to treat allergies like influenza, common cold, etc., were taken by the individuals to treat “long COVID,” also known as post-acute sequelae SARS-CoV-2 infection (PASC), a condition that affects millions worldwide and has no established treatment protocol.
“PASC is an emerging global health crisis, with an estimated prevalence of 30 percent. PASC is often painful, debilitating, and impairs daily functioning. The United States (US) Centers for Disease Control and Prevention (CDC) reports that two-thirds of patients hospitalized with SARS-CoV-2 develop PASC within 6 months after infection,” according to a study (pdf) published by Science Direct.
Patient One, a white woman in her 40s who is believed to have contracted COVID-19 in January 2020, developed “profound fatigue, malaise, and headache” within 72 hours of exposure. Subsequently, her body began developing rashes, chest pain, night sweats, dry cough, brain fog, etc.
In June, Patient One ate cheese, which triggered an allergy. As a result, she took 50 milligrams of diphenhydramine Hcl, an over-the-counter oral histamine antagonist.
“The following morning, she noted considerable relief of fatigue and improved ability to concentrate. She did not take additional histamine antagonists for the next 72 hours, during which time she experienced a recurrence of the fatigue and cognitive symptoms,” the report states.
Six months later, she began taking 25 mg of hydroxyzine pamoate, another antihistamine, on a daily basis. Patient One experienced partial symptom resolution. When the dosage was raised to 50 mg, she saw an almost complete resolution of symptoms such as brain fog, fatigue, and chest pain.
She has remained on this regime for over nine months, reporting significant decreases in bruises, rashes, and headaches. Patient One has now returned to work, does moderate exercise, and reports achieving roughly 90 percent of her pre-PASC functioning.
Patient Two, another white woman employed as a teacher, developed body aches and a cough 48 hours after being exposed to the virus. She experienced chills, inspiratory chest pain, joint pain, shortness of breath, insomnia, dysgeusia, abdominal pain, and bilateral acrocyanosis in her hands through the next few months. She began taking baby aspirin and saw a decrease in some symptoms after nine months.
Thirteen months after contracting COVID-19, Patient Two began taking antihistamine fexofenadine.
“The following morning, she noted resolution of brain fog and fatigue,” the report states. “She therefore continued the diphenhydramine daily, whereupon she noted marked improvement in brain fog, fatigue, and abdominal pain, and abatement of anosmia and dysgeusia.”
At the time the report was published, the patient was still taking antihistamines, and had reached 95 percent pre-COVID function.
The paper was authored by two nursing scholars at the University of California, Irvine (UCI). Most patients who were approached by the two researchers told them that healthcare providers usually never recommended anything that helped them deal with their condition, Melissa Pinto, one of the authors of the study, told UCI.
“Currently, there is no cure for PASC, only symptom management. A number of options are being tried, with antihistamines being one of them. The possibility that an easy-to-access, over-the-counter medication could ease some of the PASC symptoms should offer hope to the estimated 54 million people worldwide who have been in distress for months or even years,” Pinto said.
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