Levomepromazine is a lipophilic compound (psych. drug), it has a tertiair amino-group
(dimethyl- and isobutyl-ated) which is weakly basic.
This assumption is made on pure 'chemical-structural' interpretation (pKb constant couldn't be found though). There are no acidic groups in it.
Based on its lipophilic character it is not ionized in body fluid
IUPAC name:
(2R)-3-(2-Methoxyphenothiazine-10-yl-)-N,N,2-trimethylpropanamine