Siris S G, Rifkin A, Reardon G T, November M
Am J Psychiatry. 1983 Aug;140(8):1069-71. doi: 10.1176/ajp.140.8.1069.
Patients receiving fluphenazine decanoate who were switched from adjunctive benztropine to imipramine in a double-blind trial experienced marked exacerbations of extrapyramidal side effects. No substantial increase in anticholinergic side effects occurred, however, when imipramine was added to fluphenazine decanoate and benztropine.