Two patients receiving large doses of phenothiazines developed symptoms of postural hypotension while sitting. Because they were without symptoms when walking and because the hypotensive state closely resembled sleep, recognition of the true nature of the situation was delayed.
Both cases are presented in order to emphasize an unusual and potentially hazardous manifestation of a common side effect of phenothiazine therapy.
Jefferson JW. Atypical Manifestations of Postural Hypotension. Arch Gen Psychiatry. 1972;27(2):250-251. doi:10.1001/archpsyc.1972.01750260092014