What pill is white with 40 with a split between the 4 and the 0 and apo on the other side?

The pill you are describing is identified as Amphetamine and Dextroamphetamine 40 mg, which is used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. It is a white, capsule-shaped tablet with "40" on one side and "APO" on the other. Always consult a healthcare professional for proper identification and advice regarding medications.