In the column where medications are listed (like lasix) there was a (P) in an entry. What did it mean?
Answer: Supplied by Laurie Ross of Ironmaidens Thoroughbreds:
Which entries are you looking at? Timeform? Racing Post? We normally don't have an L (P) here in the U.S.- only thing I can think of is that the designation shows that a horse such as Tepin previously raced on Lasix. Lasix (Previously).