Amperozide (FG 5606, N-ethyl-4-[4',4'-bis(p-fluorophenyl)butyl]-1-piperazine-carboxamide) is an atypical antipsychotic drug which has relatively weak in vitro affinity for striatal dopamine2 (D2) receptors and a strong affinity for the cortical 5-HT2A receptor. It was shown in animal models, that amperozide could attenuate craving for cocaine. In addition, this drug was studied in patients with schizophrenia and was shown, that several patients had improvements as was assessed by the Clinical Global Improvement Scale. However, these studies were discontinued.

Zuclopenthixol is indicated the management of the manifestations of schizophrenia and other mental illnesses with disturbances in thinking, emotional reactions and behaviour. It is also used to treat the manic phase of manic depressive illness. Zuclopenthixol, a thioxanthene derivative, has high affinity for both dopamine D1 receptors and dopamine D2 receptors. Zuclopenthixol also has high affinity for α1-adrenergic and 5-HT2 receptors. Zuclopenthixol (CLOPIXOL®) is avavilable in the form of tablets and solution for intramuscular injections.

Flunarizine is a selective calcium entry blocker with calmodulin binding properties and histamine H1 / dopamine D2 blocking activity. It is not available in the US but marketed in other countries for prophylaxis of a migraine, occlusive peripheral vascular disease, the vertigo of central and peripheral origin, motion sickness and as an adjuvant in the therapy of epilepsy. The drug is also investigated for the treatment of schizophrenia.

Trifluperidol is an antipsychotic butyrophenone derivative. It is a high-affinity sigma receptor blocker and it was strongly selective for NR1a/2B receptors. It exhibit pharmacological effects and a mechanism of action very similar to that of phenothiazines and thioxanthenes in that it blocks dopaminergic receptors. It is more selective with respect to D2 receptors. Trifluperidol is indicated for the treatment of acute and chronic schizophrenia, mania and hypomania, organic psychoses, childhood behavioral disorders, agitation in psychotic illness and motor tics. Trifluperidol has been suspected as a cause of cataract in Japan. Patients receiving trifluperidol treatment may develop a parkinsonian-like syndrome which responds to withdrawal of the drug or concurrent administration of an anti-parkinsonian drug. Acute dystonias and akathisia are other acute extrapyramidal effects; tardive dyskinesia may supervene after longer periods of treatment.

Thioproperazine is a potent neuroleptic with antipsychotic properties. Thioproperazine has a marked cataleptic and antiapomorphine activity associated with relatively slight sedative, hypothermic and spasmolytic effects. It is virtually without antiserotonin and hypotensive action and has no antihistaminic property. It is used for the treatment of all types of acute and chronic schizophrenia, including those which did not respond to the usual neuroleptics; manic syndromes. Overdosage may result in severe extrapyramidal symptoms with dysphagia, marked sialorrhea, persistent and rapidly increasing hyperthermia, pulmonary syndrome, state of shock with pallor and profuse sweating, which may be followed by collapse and coma.