Ativan for catatonia

What is the maximum daily dose of ativan you have used for treatment of catatonia? I currently have an inpatient responding to 4 mg QID, with catatonia 2/2 depressive illness. He persists with residual catatonic symptoms, word finding difficulties, latent responses, at times appearing to get locked up in his thoughts when asked a questions. Not sedated at all from this dose.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums