Historical clue formulations

• "The little blue pill" — 2026-07-27
• Cialis alternative — 2025-08-17
• Cialis alternative — 2025-02-16
• Pfizer drug — 2019-03-30
• Pfizer product — 2019-02-08
• The "little blue pill" — 2015-06-07
• Product touted by Hugh Hefner — 2014-11-12
• Alternative to Cialis — 2010-07-25
• Product once pitched by Pelé — 2008-10-23
• Sex therapist's suggestion — 2007-08-11
• Medical breakthrough of 1998 — 2005-02-06
• Sildenafil citrate, commonly — 2003-07-11
• Marketing sensation of 1998 — 1999-07-31