According to Brown, it appears the hoarders include doctors and dentists who are writing prescriptions for themselves or family members.

“Pharmacists are seeing an increase in requests and prescriptions for them in instances where it’s not clear why the patient needs it at this time,” he says.

Brown is suggesting that pharmacists restrict prescription quantities and fill prescriptions only for patients with an active need for hydroxychloroquine.

In a statement, CVS Health said the company is “monitoring the global pharmaceutical manufacturing environment and working with our suppliers to ensure we can continue filling prescriptions for our pharmacy patients and plan members.”

CVS says it has an adequate supply of hydroxychloroquine and is taking steps to make sure the supply remains stable. Some data show hospitals stocking up on the drug as well.