Psyzine

Low dosage: 'Stelazine' is indicated as an adjunct in the short-term management of anxiety states, depressive symptoms secondary to anxiety, and agitation. It is also indicated in the symptomatic treatment of nausea and vomiting.

High dosage: Treatment of symptoms and prevention of relapse in schizophrenia and in other psychoses, especially of the paranoid type, but not in depressive psychoses. It may also be used as an adjunct in the short-term management of severe psychomotor agitation and of dangerously impulsive behaviour in, for example, mental subnormality.

Dosage:

Adults: Low dosage: 2-4 mg a day, given in divided doses, according to the severity of the patient's condition. If necessary, dosage may be increased to 6 mg a day, but above this level extrapyramidal symptoms are more likely to occur in some patients.

High dosage: The recommended starting dose for physically fit adults is 5 mg twice a day; after a week this may be increased to 15 mg a day. If necessary, further increases of 5 mg may be made at three-day intervals, but not more often. When satisfactory control has been achieved, dosage should be reduced gradually until an effective maintenance level has been established.

As with all major tranquillisers clinical improvement may not be evident for several weeks after starting treatment, and there may also be delay before recurrence of symptoms after stopping treatment. Gradual withdrawal from high-dosage treatment is advisable.

Children: Low dosage: For children aged 6-12 years, up to a maximum of 4 mg a day given in divided doses.

High dosage: For children aged under 12 years, the initial oral dosage should not exceed 5mg a day, given in divided doses. Any subsequent increase should be made with caution, at intervals of not less than three days, and taking into account age, body weight and severity of symptoms.

Elderly: The starting dose for elderly or frail patients should be reduced by at least half.

Administration:

Oral

Do not use 'Stelazine' in comatose patients, particularly is associated with other central nervous system depressants. Do not use 'Stelazine' in those patients with existing blood dyscrasias or known liver damage, or in those hypersensitive to Psyzine, related compounds, or any of the excipients. Patients with uncontrolled cardiac decompensation should not be given 'Stelazine'.

'Stelazine' should be discontinued at the first sign of clinical symptoms of tardive dyskinesia and Neuroleptic Malignant Syndrome.

Patients on long-term phenothiazine therapy require regular and careful surveillance with particular attention to tardive dyskinesia and possible eye changes, blood dyscrasias, liver dysfunction and myocardial conduction defects, particularly if other concurrently administered drugs have potential effects in these systems.

Care should be taken when treating elderly patients, and the initial dosage should be reduced. Such patients can be especially sensitive, particularly to extrapyramidal and hypotensive effects. Patients with cardiovascular disease including arrhythmias should also be treated with caution. Because 'Stelazine' may increase activity, care should be taken in patients with angina pectoris. If an increase in pain is noted, the drug should be discontinued. Patients who have demonstrated bone marrow suppression or jaundice with a phenothiazine should not be re-exposed to 'Stelazine (or any Psyzine) unless in the judgement of the physician the potential benefits of treatment outweigh the possible hazard.

In patients with Parkinson's disease, symptoms may be worsened, and the effects of levodopa reversed. Since phenothiazines may lower the convulsive threshold, patients with epilepsy should be treated with caution, and metrizamide avoided. Although 'Stelazine' has minimal anticholinergic activity, this should be borne in mind when treating patients with narrow angle glaucoma, myasthenia gravis or prostatic hypertrophy.

Nausea and vomiting as a sign of organic disease may be masked by the antiemetic action of 'Stelazine'.

An approximately 3-fold increased risk of cerebrovascular adverse events have been seen in randomised placebo controlled clinical trials in the dementia population with some atypical antipsychotics. The mechanism for this increased risk is not known. Stelazine should be used with caution in patients with risk factors for stroke

Caution should be used in patients with cardiovascular disease or family history of QT prolongation. Concomitant use of neuroleptics should be avoided.

Cases of venous thromboembolism (VTE) have been reported with antipsychotic drugs. Since patients treated with antipsychotics often present with acquired risk factors for VTE, all possible risk factors for VTE should be identified before and during treatment with Stelazine and preventive measures undertaken

Acute withdrawal symptoms including nausea, vomiting and insomnia have been described after abrupt cessation of high doses of antipsychotic drugs. Recurrence of psychotic symptoms may also occur, and the emergence of involuntary movement disorders (such as akathisia, dystonia and dyskinesia) has been reported. Therefore, a gradual withdrawal is advisable.

Phenothiazines should be used with care in extremes of temperature since they may affect body temperature control.

Increased Mortality in Elderly people with Dementia

Data from two large observational studies showed that elderly people with dementia who are treated with antipsychotics are at a small increased risk of death compared with those who are not treated. There are insufficient data to give a firm estimate of the precise magnitude of the risk and the cause of the increased risk is not known.

Stelazine is not licensed for the treatment of dementia-related behavioural disturbances.

Stelazine may cause side effects including drowsiness, dizziness and visual disturbances which interfere with the ability to drive and operate machinery. Do not drive or use machines when you first start to take this medicine until you are certain that you are not getting these side effects

Lassitude, drowsiness, dizziness, transient restlessness, insomnia, dry mouth, blurred vision, muscular weakness, anorexia, mild postural hypotension, skin reactions including photosensitivity reactions, weight gain, oedema and confusion may occasionally occur. Tachycardia, constipation, urinary hesitancy and retention, and hyperpyrexia have been reported very rarely. Adverse reactions tend to be dose-related and to disappear.

Hyperprolactinaemia may occur at higher dosages with associated effects such as galactorrhoea, amenorrhoea or gynaecomastia; certain hormone-dependent breast neoplasms may be affected. Phenothiazines can produce ECG changes with prolongation of the QT interval and T-wave changes; ventricular arrhythmias( VF,VT(rare)), sudden unexplained deaths; cardiac arrest and Torsades de pointes have been reported. Such effects are rare with 'Stelazine'.

In some patients, especially non-psychotic patients, 'Stelazine' even at low dosage may cause unpleasant symptoms of being dulled or, paradoxically, of being agitated.

Extrapyramidal symptoms are rare at oral daily dosages of 6 mg or less; they are considerably more common at higher dosage levels. These symptoms include parkinsonism; akathisia, with motor restlessness and difficulty in sitting still; and acute dystonia or dyskinesia, which may occur early in treatment and may present with torticollis, facial grimacing, trismus, tongue protrusion and abnormal eye movements including oculogyric crises. These effects are likely to be particularly severe in children. Such reactions may often be controlled by reducing the dosage or by stopping medication. In more severe dystonic reactions, an anticholinergic antiparkinsonism drug should be given.

Tardive dyskinesia of the facial muscles, sometimes with involuntary movements of the extremities, has occurred in some patients on long-term, high-dosage and, more rarely, low-dosage phenothiazine therapy, including 'Stelazine'. Symptoms may appear for the first time either during or after a course of treatment; they may become worse when treatment is stopped. The symptoms may persist for many months or even years, and while they gradually disappear in some patients, they appear to be permanent in others.

Patients have most commonly been elderly, female or with organic brain damage. Particular caution should be observed in treating such patients.

Periodic gradual reduction of dosage to reveal persisting dyskinesia has been suggested, so that treatment may be stopped if necessary.

Anticholinergic antiparkinsonism agents may aggravate the condition. Since the occurrence of tardive dyskinesia may be related to length of treatment and dosage, Psyzine should be given for as short a time and at as low a dosage as possible

The neuroleptic malignant syndrome is a rare but occasionally fatal complication of treatment with neuroleptic drugs, and is characterised by hyperpyrexia, muscle rigidity, altered consciousness and autonomic instability. Intensive symptomatic treatment, following discontinuation of 'Stelazine', should include cooling. Intravenous dantrolene has been suggested for muscle rigidity.

Mild cholestatic jaundice and blood dyscrasias such as agranulocytosis, pancytopenia, leucopenia and thrombocytopenia have been reported very rarely.

Signs of persistent infection should be investigated.

Very rare cases of skin pigmentation and lenticular opacities have been reported with Stelazine'. Withdrawal reactions have been reported in association with antipyschotic drugs(see 4.4)..

Cases of venous thromboembolism, including cases of pulmonary embolism and cases of deep vein thrombosis have been reported with antipsychotic drugs- Frequency unknown.

Pregnancy, puerperium and perinatal conditions-Drug withdrawal syndrome neonatal (see 4.6) -Frequency not known.

Signs and symptoms will be predominantly extrapyramidal; hypotension may occur. Absorption of Psyzine from the 'Spansule' capsule is likely to be prolonged and this should be borne in mind. Treatment consists of gastric lavage together with supportive and symptomatic measures. Do not induce vomiting. Extrapyramidal symptoms may be treated with an anticholinergic antiparkinsonism drug. Treat hypotension with fluid replacement; if severe or persistent, noradrenaline may be considered. Adrenaline is contra-indicated.

'Stelazine' is a Piperazine Phenothiazine tranquiliser with potent anti-psychotic, anxiolytic and antiemetic activity, and a pharmacological profile of moderate sedative and hypotensive properties, and fairly pronounced tendency to cause extrapyramidal reactions.

Psyzine is well absorbed but undergoes extensive first pass metabolism. Distribution is wide and elimination occurs in the bile and urine. Inactive ingredients in the tablets include sucrose.

Not applicable.

None known.

Not applicable