Yes, DOPAMINES is a Scrabble word!

Letter values in Scrabble US: D 2, O 1, P 3, A 1, M 3, I 1, N 1, E 1, S 1.

Is it a valid word?

DOPAMINES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a monoamine neurotransmitter found in the brain and essential for the normal functioning of the central nervous system; as a drug (trade names Dopastat and Intropin) it is used to treat shock and hypotension

Not playable in Scrabble US: DOPASTAT, INTROPIN.