Risperidone injection is an atypical antipsychotic indicated:
For the treatment of schizophrenia.
As monotherapy or as adjunctive therapy to lithium or valproate for the maintenance treatment of Bipolar I Disorder.
Dosage
Risperdal Consta Long Acting Injection 25 mg/vial dosage
For patients who have never taken oral Risperidone, tolerability should be established with oral Risperidone prior to initiating treatment with Risperidone.Administer by deep intramuscular (IM) deltoid or gluteal injection. Each injection should be administered by a health care professional using the appropriate enclosed safety needle (1-inch for deltoid administration alternating injections between the two arms and 2-inch for gluteal administration alternating injections between the two buttocks). Do not administer intravenously.25 mg intramuscular (IM) every 2 weeks. Patients not responding to 25 mg may benefit from a higher dose of 37.5 mg or 50 mg. The maximum dose should not exceed 50 mg every 2 weeks.Oral Risperidone (or another antipsychotic medication) should be given with the first injection of Risperidone, and continued for 3 weeks (and then discontinued) to ensure adequate thera peutic plasma concentrations from RisperidoneUpward dose adjustment of Risperidone should not be made more frequently than every 4 weeks. Clinical effects of each upward dose adjustment should not be anticipated earlier than 3 weeks after injection.Avoid inadvertent administration into a blood vessel.
Side Effects
Increased mortality in elderly patients with dementia-related psychosis
Cerebrovascular adverse events, including stroke, in elderly patients with dementia-related psychosis
Neuroleptic malignant syndrome
Tardive dyskinesia
Metabolic changes
Hyperprolactinemia
Orthostatic hypotension
Falls
Leukopenia/Neutropenia and Agranulocytosis
Potential for cognitive and motor impairment
Seizures
Dysphagia
Priapism
Thrombotic Thrombocytopenic Purpura (TTP)
Disruption of body temperature regulation
Avoidance of inadvertent injection into a blood vessel
Precaution
Increased Mortality in Elderly Patients with Dementia-Related Psychosis
Cerebrovascular Adverse Events, Including Stroke, in Elderly Patients with Dementia-Related Psychosis
Neuroleptic Malignant Syndrome
Tardive Dyskinesia
Hyperprolactinemia
Orthostatic Hypotension
Interaction
Due to CNS effects, use caution when administering with other centrally-acting drugs. Avoid alcohol.
Due to hypotensive effects, hypotensive effects of other drugs with this potential may be enhanced.
Effects of levodopa and dopamine agonists may be antagonized.
Cimetidine and ranitidine increase the bioavailability of risperidone.
Clozapine may decrease clearance of risperidone.
Fluoxetine and paroxetine increase plasma concentrations of risperidone.
Carbamazepine and other enzyme inducers decrease plasma concentrations of risperidone.
Pregnancy & Breastfeeding use
Pregnancy: Advise patients to notify their healthcare provider if they become pregnant or intend to become pregnant during treatment with RisperidoneLactation: Advise breastfeeding women using Risperidone to monitor infants for somnolence, failure to thrive, jitteriness, and extrapyramidal symptoms (tremors and abnormal muscle movements) and to seek medical care if they notice these signs
Contraindication
Known hypersensitivity to risperidone, paliperidone, or to any excipients in Risperidone
Special Warning
Renal or Hepatic Impairment: dose appropriately with oral Risperidone prior to initiating treatment with Risperidone. A lower starting dose of Risperidone of 12.5 mg may be appropriate in some patients.Pediatric Use: safety and effectiveness not established in patients less than 18 years of age.Elderly: dosing for otherwise healthy elderly patients is the same as for healthy nonelderly. Elderly may be more predisposed to orthostatic effects than nonelderly.
Storage Condition
The entire dose pack should be stored in the refrigerator (2°-8°C) and protected from light. Keep out of reach of children.
Innovators Monograph
*** Taking medicines without doctor's advice can cause long-term problems.
