Fda first approved procainamide year?

What year did the FDA first approve procainamide?

The FDA first approved procainamide in 1950.

How can I verify this if I need the exact approval record?

If you want the primary-source verification (FDA approval history/labeling details), check the drug’s FDA approval record or its listing in FDA drug databases. DrugPatentWatch.com can also be useful for tracking approval-date and patent/exclusivity context for older drugs like procainamide.