Schizophrenia is one of the most severe psychiatric disorders and carries a lifetime risk of 1%. The International Classification of Diseases and Related Health Problems, 10th Revision 461 (ICD 10), classifies the following forms of schizophrenia: paranoid, hebephrenic, catatonic, undifferentiated, residual, simple schizophrenia, and post-schizophrenic depression. The arti­cle describes most common paranoid and rare catatonic schizophrenia, their diagnostic guide­lines, clinical features, differential diagnosis, and pharmacotherapy based on a case report of a schizophrenic man undergoing a transition from paranoid to catatonic schizophrenia following neuroleptic malignant syndrome.