Abilify Does Not Cause Penile Shrinkage
Abilify (aripiprazole) does not cause penile shrinkage. In fact, the evidence demonstrates that aripiprazole actually improves sexual function, including erectile function, in patients experiencing sexual dysfunction from other antipsychotics.
The Evidence Shows Improvement, Not Harm
The concern about penile shrinkage with antipsychotics is unfounded for aripiprazole. While many antipsychotics can cause sexual dysfunction through mechanisms like hyperprolactinemia (elevated prolactin levels that suppress testosterone and impair erectile function) 1, aripiprazole has the opposite effect.
What the Research Actually Shows
Multiple studies demonstrate that switching to or adding aripiprazole improves erectile function:
A 2021 systematic review found that aripiprazole effectively improved penile erectile function in schizophrenia patients with erectile dysfunction, whether used as add-on therapy or by switching from other antipsychotics 2
A 2017 study of 75 male patients showed significant improvement in erectile function scores after switching to aripiprazole from risperidone or amisulpride, with restoration of sexual function to baseline levels within 8 weeks 3
A 2012 prospective study demonstrated significant improvement in "penile erection" as measured by validated scales after switching to aripiprazole, with significant decreases in prolactin levels 4
A 2008 study found that both erectile and ejaculatory difficulties were significantly reduced in males after switching to aripiprazole (P = 0.04 and P = 0.017, respectively) 5
Why Aripiprazole Is Different
Aripiprazole's unique pharmacological profile explains these beneficial effects:
- It lowers prolactin levels rather than raising them like many other antipsychotics 6, 4
- It has partial dopamine agonist activity, which helps maintain normal sexual function
- When combined with other antipsychotics that cause sexual side effects, aripiprazole can reduce hyperprolactinemia and sexual dysfunction 6
Clinical Bottom Line
If a patient reports concerns about penile changes or sexual dysfunction:
- Reassure them that aripiprazole does not cause penile shrinkage
- If they're experiencing sexual dysfunction from another antipsychotic, consider switching to or adding aripiprazole, which may actually improve their symptoms
- Monitor prolactin levels if sexual dysfunction is present—elevated prolactin from other medications may be the culprit
- Be aware that psychotropic drugs in general can affect sexual function through direct effects or by altering prolactin/testosterone levels 1, but aripiprazole is among the least likely to cause these problems
The FDA label for Abilify lists sexual dysfunction as a potential side effect in the context of antipsychotic polypharmacy 7, but this reflects the general class effect of antipsychotics, not a specific problem with aripiprazole monotherapy—which the research shows actually treats rather than causes sexual dysfunction.