What happens if a normal person take sulpiride?

Maybe nothing: Generally one would expect to be a bit sedated, , relief of anxiety and depression if present , possibly some extrapyrimidal effects, like a muscle cramp or abnormal movement of mouth , tongue or limbs. One dose is likely to do nothing as most medications require several doses to actually build up in the body to a therapeutic level. One should never take medications not prescribed for them

Dogmatil/ Sulpiride: There is potential for rare side effects such as tardive dyskinesia, neuroleptic malignant syndrome, blood dyscrasias, seizures & abnormal cardiac rhythms, as well as more common side effects such as weight gain, dry mouth, constipation, blurred vision, tremor, increased blood sugar, dsystonia, insomnia, akathisia, somnolence etc.