How is risperidone metabolized?

Metabolism Risperidone is extensively metabolized in the liver. The main metabolic pathway is through hydroxylation of risperidone to 9-hydroxyrisperidone by the enzyme, CYP 2D6. A minor metabolic pathway is through N-dealkylation.

Where is risperidone excreted?

Unchanged risperidone was mainly excreted in the urine and accounted for 30, 11, and 4% of the administered dose in the poor, intermediate, and extensive metabolizer of debrisoquine, respectively.

What enzyme metabolizes risperidone?

Risperidone in humans is mainly metabolized to 9-hydroxyrisperidone by the polymorphic cytochrome enzyme P450 2D6 (CYP2D6). Plasma concentrations of risperidone and 9-hydroxyrisperidone show large interindividual variability, which may be partly related to the activity of the CYP2D6 enzyme.

What’s the half life of risperidone?


Clinical data
Metabolism Liver (CYP2D6 mediated to 9-hydroxyrisperidone)
Elimination half-life 20 hours (by mouth), 3–6 days (IM)
Excretion Urinary (70%) feces (14%)

How are antipsychotics metabolized?

Olanzapine is metabolized primarily by direct glucuronidation and CYP1A2 and to a lesser extent by CYP2D6 and CYP3A4. Quetiapine is metabolized by CYP3A4, as is ziprasidone, although in the latter case aldehyde oxidase is the enzyme responsible for most of the metabolism.

What medications Cannot be taken with risperidone?

These medications may interact and cause very harmful effects.

Serious Interactions

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What is risperidone 3 mg used for?

Risperidone is used to treat schizophrenia, bipolar disorder, or irritability associated with autistic disorder. This medicine should not be used to treat behavioral problems in older adults who have dementia. This medicine is available only with your doctor’s prescription.

Is risperidone a CYP2D6 inhibitor?

Risperidone is an active compound that is mainly metabolized in the liver by cytochrome P450 enzymes such as CYP2D6. An active metabolite in the main hydroxylation pathway is 9-hydroxyrisperidone.

What is another name for risperidone?

Risperidone is available under the following different brand names: Risperdal, Risperdal Consta, and Risperdal M-Tab.

Is 2 mg of risperidone a lot?

Adults. RISPERDAL® can be administered once or twice daily. Initial dosing is 2 mg per day. May increase the dose at intervals of 24 hours or greater, in increments of 1 to 2 mg per day, as tolerated, to a recommended dose of 4 to 8 mg per day.

Is 1 mg of risperidone a lot?

The optimum dose is 1 mg once daily for most patients. Some patients, however, may benefit from 0.5 mg once daily while others may require 1.5 mg once daily.

What time of day should you take risperidone?

Once a day: this is usually in the evening. Twice a day: this should be once in the morning and once in the evening. Ideally these times are 10–12 hours apart, for example some time between 7 and 8 am, and between 7 and 8 pm.

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