Pink/Blue Capsule 310 over 25

[kma365]

Looking to find out what type of medication this is. It is a pink and blue capsule with 310 written over 25. There is also a symbol like some type of B on it. Unable to locate using identifier. Anyone have suggestions? I have about 6 of these and not sure what they are exactly.

[kirby]

The capsule is doxepin 25 mg, an antidepressant. This imprint is discontinued.