What pill is dark blue on one end and light blue on the other end, symbols L and 6 imprinted?

Diphenhydramine 25mg - Acetaminophen 500mg
The combination of acetaminophen and diphenhydramine is used to treat runny nose, sneezing, watery eyes, and pain or fever caused by allergies, the common cold, or the flu. This medication is also used to treat night time pain and help you sleep.