No.
Naltrexone is FDA-approved for treating opioid and alcohol addiction, and (in combination with bupropion) for weight management. It is not FDA-approved for PCOS, and clinicians who prescribe Low Dose Naltrexone for PCOS are doing so off-label.
Off-label prescribing is legal and common in medicine — once a medication is FDA-approved for one use, clinicians can prescribe it for other conditions based on their clinical judgment and the available evidence. Many treatments commonly used for PCOS, including some that Oana does offer (like oral minoxidil and spironolactone), are prescribed off-label.
What "off-label" means in practical terms for LDN: there's no large-scale FDA review of LDN specifically for PCOS, and the research base is smaller and earlier than what exists for treatments like metformin, spironolactone, or GLP-1 medications. Clinicians who prescribe LDN for PCOS are working from a smaller evidence base — which doesn't mean it doesn't help, but it does mean expectations should be calibrated accordingly.
Oana doesn't currently prescribe LDN. If you're considering it, this is a conversation worth having with a clinician who has direct experience prescribing it for PCOS.