From the digestive system: transient intestinal spasms.
From the nervous system: extrapyramidal disorders (in children and people with increased permeability of the blood-brain barrier).
Mental disorders: very rarely - agitation, nervousness, cramps, drowsiness.
Allergic reactions: skin rash, hives.
Other: hyperprolactinemia (galactorrhea, gynecomastia).
Such side effects as convulsions, drowsiness and agitation are very rare and occur mainly in children and newborns.