Answer: dopamine

AnswerCrossword Clue
DOPAMINEEssential neurotransmitter
DOPAMINENeurotransmitter of note
DOPAMINEPleasure-associated neurotransmitter
DOPAMINE'Feel-good brain chemical'
dopaminecatecholamine neurotransmitter in the central nervous system, retina, and sympathetic ganglia, acting within the brain to help regulate movement and emotion: its depletion may cause Parkinson's disease
dopaminea form of dopa used to stimulate the heart
dopaminedopamine preparation used to increase the force of contraction of the heart in the treatment of shock