Lithium and lecithin in tardive dyskinesia: an update.

Psychiatric inpatients with tardive dyskinesia (TD) were treated with either lithium alone (n = 9) or with a combination of lithium and lecithin (n = 9) for 5 weeks in a double-blind, placebo-controlled experiment. A statistically significant but clinically unimportant improvement of TD occurred during both treatments. The addition of lecithin to lithium had no effect.