Long-term side effects?
Long-term side effects are unknown. The study duration of ROBIN and SKYLARK was 45 days.
Breastfeeding?
Use in lactation has not yet been studied. Continued research is needed.
Can it be used in mood changes related to other reproductive changes or diagnoses like premenstrual dysphoric disorder and perimenopause?
The mechanism by which zuranolone is thought to work – that is, during changes in reproductive hormones – is implicated in other reproductive transitions such as premenstrual dysphoric disorder and perimenopause when reproductive hormones are fluctuating, though at lower levels than in pregnancy. Research will be required to assess efficacy and safety; however, the mechanistic reasons is worth pursuing. Additionally, zuranolone has not been studied in postpartum psychosis.
Can zuranolone be used to treat other affective conditions besides postpartum depression? Bipolar disorder?
Whether it may be beneficial for patients with a depressive episode that is part of an underlying bipolar disorder or other psychiatric illness is not yet known.
Anxiety?
Along with depressive symptoms, women who received zuranolone in the clinical trials also had improvements in anxiety symptoms. These findings provide some hope that zuranolone may eventually be beneficial in patients with anxiety.
However, to date zuranolone has not been directly studied as a treatment for anxiety disorders (such as generalized anxiety disorder, panic disorder, etc.), so its efficacy for these illnesses is currently unknown.
Insomnia?
In a study of 153 postpartum women, randomized to placebo or zuranolone, scale questions for insomnia were improved in the group receiving zuranolone. This provides some hope that, if zuranolone is appropriate, concurrent polypharmacy with a sleep aid can be avoided. Additionally, future evaluation of use in insomnia outside of PPD may be warranted.
How is it different from brexanolone?
The two are slightly different molecules. Brexanolone is synthetically identical to allopregnanolone and zuranolone has been altered to be active and orally bioavailable.
Brexanolone is a 60-hour infusion that requires hospital admission at an approved health care site. Zuranolone is an oral at-home once-daily dosing treatment for 14 days. Zuranolone does not require enrollment in a risk evaluation and mitigation strategy for risk of excessive sedation and sudden loss of consciousness.
When would you consider zuranolone vs. brexanolone vs. other antidepressants?
Zuranolone and brexanolone are rapid-acting antidepressants with a response within 14 days or 60 hours, respectively. Antidepressants such as SSRIs/SNRIs are still available, well studied, and work, although take longer to reach clinical efficacy and are accompanied by potentially troubling side effects (for example, weight gain, sexual dysfunction).
Dr. Samantha Meltzer-Brody
Time to treatment effect should be considered when assessing severity of symptoms and functional impairment of the mother and the overall family unit. Brexanolone requires continuous monitoring which may be beneficial for women who are severely impaired and may benefit from frequent clinical monitoring. Brexanolone does not require a dose reduction with hepatic impairment, however, should be avoided in end-stage renal disease because of the potential accumulation of the solubilizing agent.