Historical clue formulations

• You may find it hard to swallow — 2025-04-25
• *Pill form — 2020-04-03
• Pill type — 2016-01-10
• It's easy to swallow — 2014-09-05
• Pill variety — 2006-09-20
• It's hard, to swallow — 2004-02-29
• Modern pill — 1999-05-16
• Pill popper's pop — 1998-07-19
• Pill variety — 1997-08-16