Risdon
Cheaper & Alternative Brands
Same generic (Risperidone), same form (Oral Solution)
Clinical Prescribing Information
Medical monograph and safety information for healthcare professionals & patients.Indications & Clinical Uses
Frenia tablet is indicated for the treatment of-
Acute and chronic psychoses
Mania
Schizophrenia
Dosage & Administration
Psychoses
:
2 mg in 1-2 divided doses on 1
st
day then 4 mg in 1-2 divided doses on second day (Slower titration appropriate in some patients);
Usual dose range 4-6 mg daily; doses above 10 mg daily only if benefit considered to outweigh risk (max. 16 mg daily).
Elderly (or in hepatic or renal impairment) initially 1 mg daily in two divided doses increased in steps of 1-2 mg twice daily.
Child under 15 years not recommended.
Mania
:
Initially, 2 mg once daily increased if necessary in step of 1 mg daily; usual dose range 1-6 mg daily;
Elderly (or in hepatic or renal impairment) initially 1 mg daily in two divided doses increased in steps of 1-2 mg twice daily.
Schizophrenia
:
Risperidone should be generally administered at 1 mg BID initially, with increases in increments of 1 mg BID on the second and third day, as tolerated, to a target dose of 3 mg BID by the third day.
Further dosage adjustments, if indicated, should generally occur at intervals of not less than 1 week. When dosage adjustments are necessary, small dose increments/decrements of 1-2 mg are recommended.
Contraindications
Risperidone is contraindicated in patients with a known hypersensitivity to the product.
Side Effects & Adverse Reactions
Insomnia, agitation, anxiety, headache, less commonly drowsiness, impaired concentration, fatigue, blurred vision, constipation, nausea and vomiting, dyspepsia, abdominal pain, hyperprolactinaemia, urine incontinence, tachycardia, hypertension, edema, rash, rhinitis, cerebrovascular accident, neurtropenia and thrombocytopenia have been reported.
Warnings & Precautions
Special precaution should be taken in case of preexisting cardiovascular diseases, discontinue use if signs and symptoms of tardive dyskinesia occur, renal and hepatic impairment, elderly epilepsy, Parkinson's disease and in pregnancy.
Pharmacology & Mechanism of Action
Risperidone is a selective monoaminergic antagonist having a high affinity for serotoninergic 5-HT
2
and dopaminergic D
2
receptors. Risperidone binds also to alpha
1
adrenergic receptors and with lower affinity, to H
1
histamine and alpha
2
adrenergic receptors. Risperidone has no affinity for 8 cholinergic receptors. Risperidone, as a potent D
2
antagonist, improves the positive symptoms of schizophrenia but causes less depression of motor activity. Balanced central serotonin and dopamine antagonism may reduce extrapyramidal side effect liability and extend the therapeutic activity to the negative and affective symptoms of schizophrenia.