One of the world records that Guinness no longer tracks is that for "most pills swallowed." But from the late 1970s to the 1990s it consistently awarded this to one C.H.A. Kilner of Malawi (or perhaps Zimbabwe — accounts differ), who apparently took A LOT of pills following a pancreatectomy (removal of his pancreas) on June 9, 1967.
The exact number of pills taken by Kilner progressively increased over time. The 1978 edition of Guinness put it at 280,131 pills. A year later it had reached 311,136. By 1981 it was 359,061. And Kilner finally stopped taking pills on June 19, 1988, having reached a total of 565,939 pills.
Later reports did the math and figured out that this worked out to 73 pills a day, and that "if all the pills he had taken were laid out end to end they would form an unbroken line two miles 186 yards long."
Where exactly was Guinness getting this information from? I have no idea, because they seem to be the only source for it. I can't find any record of this Kilner guy in medical journals.
Guinness Book of Records - 1978 Edition
Detroit Free Press - Dec 4, 1978
Logansport Pharos Tribune - Feb 7, 1982
Guinness Book of Records - 1995 Edition