Does perseris cause lumps?

Does perseris cause lumps

Perseris is an extended-release injectable form of risperidone given once a month for schizophrenia. Some patients develop small nodules or lumps at the injection site after the shot. These are usually firm, painless, and resolve on their own within a few weeks.

Why do lumps form after a Perseris injection

The drug is suspended in a biodegradable polymer that solidifies once it contacts tissue fluid. This creates a small depot under the skin that slowly releases medication. The depot itself can feel like a lump until it fully dissolves.

How long do injection-site lumps last

Most nodules shrink noticeably within two to four weeks and disappear by the next scheduled dose. A minority of patients report a lump persisting longer than one month, usually when injections are given repeatedly in the same spot.

What patients should watch for

Redness, warmth, increasing pain, or drainage around the lump can signal infection and requires prompt medical attention. Mild firmness without other symptoms is typically harmless.

Can the injection technique reduce lump formation

Rotating injection sites between the abdomen and upper arm, using the correct needle depth, and allowing the suspension to reach room temperature before injection all lower the chance of noticeable nodules.

Are there alternatives if lumps become a problem

Switching to a different long-acting injectable antipsychotic, such as Abilify Maintena or Invega Sustenna, removes the polymer depot and often eliminates the lumps. Oral risperidone is another option if injections are no longer tolerated.

When does the Perseris patent expire

DrugPatentWatch.com lists the key U.S. composition-of-matter patent for Perseris expiring in 2031, with possible pediatric extensions pushing protection into 2032.