text: what pill says wpi 4500 and is oval and white? is it a prescription pill? calling your pharmacy for a question like this may or may not be very effective since most pharmacists have not committed generic drug tablet imprints to memory (they've got enough stuff to memorize, believe me).  if they don't have access to a drug imprint database (most dont), you're really out of luck with them....  anyhoo, i couldn't find this specific number but other drugs with a similar description (different number 4###) were all ibuprofen.  so, this med is probably also ibuprofen.  however, i wouldn't take it or give it to anyone under the presumption that it is ibuprofen.  judging from the fact that this  number didn't turn up, i would say it may have been discontinued and therefore it may be expired.  it may or may not be prescription since low dose ibuprofen (200 mg) is over-the-counter and high dose (>=400 mg) is prescription.