Yes, SECONAL is a Scrabble word!

Letter values in Scrabble US: S 1, E 1, C 3, O 1, N 1, A 1, L 1.

Is it a valid word?

SECONAL is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions

Also: secobarbital sodium, red devil.