You're only old once!

I have just acquired this book after seeing it in class. It is subtitled 'a book for obsolete children' and takes a man through the medical tests that are imposed upon him and then the "pillifcation" that he is left with. Here is the beginning of the two pages:

For your pill drill you'll go to room Six Sixty three,
where a voice will instruct you "Repeat after me
This small white pill is what I munch
at breakfast and right after lunch
I take the pill that's Kelley green
before each meal and in between.
These loganberry-colored pills
I take for early morning chills.
I take the pills with zebra stripes
to cure my early evening gripes......
finishing with
This long flat one is what I take
if I should die before I wake
A highly entertaining book for those being treated as old before their time