I am trying to search data with the drug name Hydroxychloroquine from the URL here from OpenFDA API


There are 2918 relative results, but I found that only 2637 (2207 are male, 430 are female, 0 are unknown) patients with 'patientsex' feature. Could I know why does that happen? Will some results repeated or a supplemental of a result that has already existed in the database?

1 Answer 1


Reporting a patient's sex is voluntary, which is why some adverse event records do not have that information.

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