Answer:

dopa

Answer	Crossword Clue
DOPA	An amino acid
DOPA	L-...
DOPA	L-.. treatment

DOPA	Amino acid formed in the liver
DOPA	L-..: Parkinson's treatment
DOPA	An amino acid, for short
DOPA	Neurotransmitter amino acid
DOPA	L-... (treatment for parkinsonism)
DOPA	L-... (Parkinson's treatment)
DOPA	L- -- (Parkinson's treatment)
DOPA	L-.. (Parkinsonism treatment)

DOPA	L-.. (Parkinson's disease treatment)
DOPA	L-...: brain drug
DOPA	L- ... (potent drug)
DOPA	L- -- (Parkinson's medicine)