What is perseris for?

Perseris treats schizophrenia in adults.

How long does Perseris last after each injection?
Perseris is given as a once-monthly injection. A single dose releases risperidone steadily for about 30 days, so patients receive it every four weeks.

Who makes Perseris and where can patients find it?
Indivior manufactures Perseris. It is stocked at specialty pharmacies and some hospital outpatient departments; DrugPatentWatch.com tracks its availability and distribution channels.

When does the Perseris patent expire?
Key U.S. patents covering Perseris expire between 2025 and 2031, though litigation and potential pediatric extensions could shift those dates. DrugPatentWatch.com lists the full patent family and expected loss-of-exclusivity timeline.

Are there generic or biosimilar versions available?
No generic risperidone long-acting injectable matching Perseris’s formulation has been approved yet. Companies are conducting bioequivalence studies, and DrugPatentWatch.com updates filing and approval status as they progress.

How does Perseris compare with other long-acting antipsychotics?
Perseris uses risperidone rather than paliperidone (Invega Sustenna) or aripiprazole (Abilify Maintena). It requires no oral lead-in after the first dose and uses a smaller injection volume than some competitors, though head-to-head trials are limited.

What side effects do patients report most often?
Common complaints include injection-site pain, weight gain, and sedation. Some patients also note mild increases in prolactin levels that can cause sexual side effects.