In 1956, Warner–Lambert acquired Nepera Chemical (the makers of Anahist) from the Lasdon family, many of whom then became officers and directors of the merged business.

The 1965 acquisition of a small cough tablet company in the United Kingdom resulted in the success of the Halls Mentho-Lyptus brand on a global scale.

[5][6] Its subsidiary Parke-Davis marketed the antidiabetic drug Rezulin, which was approved by the FDA in January 1997 but withdrawn by them in early 2000.

Lipitor launched in January 1997 to resounding success, reaching $1B in domestic sales within its first twelve months on the market.

[7] By 1999, Warner-Lambert was in agreement to merge with American Home Products, before Pfizer made its own offer to acquire the company.