Some Vicodin pills are not as strong as others. One of the ways you can check is by looking at the markings on the Vicodin. An oval-shaped, white tablet with M357 imprinted on one side contains 5 mg of hydrocodone and 500 mg of APAP. You can find more information here: http://www.drugs.com/imprints.php?action=search&imprint=m357&color=&shape=
