|Summary sheet: Risperidone|
|Routes of Administration|
Risperidone (also known as Risperdal) is an atypical antipsychotic medication of the benzisoxazole chemical class. Risperidone is prescribed for bipolar disorder, autism, and psychotic disorders, such as in schizophrenia. It is sometimes used as a sedative to reduce the effects of psychedelics like LSD and to induce sleepiness. Benzodiazepines are also used for this purpose.
Risperidone has a complex pharmacology, but its main mechanism of action is as a D2 dopaminergic receptor antagonist. This means that it blocks dopamine from binding to the receptor, meanwhile not activating it. It also blocks most of the serotonin receptors, being an inverse agonist at the 5-HT2A, 5-HT2B, and 5-HT2C serotonin receptors. Risperidone has the strongest affinity to the 5-HT2A receptor. On top of that, it acts as an irreversible antagonist at the 5-HT7 serotonin receptor. Its hypnotic effects come from the blockade of dopamine D2 receptors.
The effects listed below are based upon the subjective effects index and personal experiences of PsychonautWiki contributors. These effects should be taken with a grain of salt and will rarely (if ever) occur all at once, but heavier doses will increase the chances of inducing a full range of effects. Likewise, adverse effects become much more likely on higher doses and may include serious injury or death.
- The general head space of risperidone is often described as one of sleepiness, emptiness, apathy, stupor and catatonia. The specific cognitive effects can be broken down into several components which progressively intensify proportional to dosage. These are described below and generally include:
Toxicity and harm potential
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- United Kingdom: Risperidone is available only through prescription.
- United States: Risperidone is available only through prescription.
- Australia: Risperidone is available only through prescription.
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