Not medical advice: The small, round, yellow pill with the imprint "DAN 5619" is "Diazepam 5 mg." The full imprint is actually "DAN 5619 5," so when searching for info on it online the "5" must be included at the end.
Diazepam is a sedative and anticonvulsant in the class of drugs known as Benzodiazepines. It's known more commonly by its brand name Valium.
The main usages of Diazepam are to treat anxiety, insomnia, and symptoms of acute alcohol withdrawal. It can be used to treat seizures and seizure disorders, such as epilepsy, but it's considered more of a short-term seizure medication. It's produced by the drug company Hoffmann-La Roche, also known as Roche.