I accidentally used Beconase Hayfever Relief Nasal Spray 2 days before my PRP Treatment. Will this affect my treatment?

Corticosteroids such as Beclometasone Dipropionate can inhibit the release of growth factors from PRP. However, a local nasal spray most likely will not deliver enough steroid to produce a systemic response. In summary, it should not affect your PRP. Find a PRP expert.
Jeff Rapaport MD FAAD
Realself Hall of Fame

Thank you for your question. The active ingredient described in that nasal spray only lasts a few hours, so the use in one single episode, two days before your treatment session is unlikely to have a significant impact on your treatment. Hope you were able to discuss this specific concern with your doctor before your treatment and have found a hair restoration treatment plan that works for you.
The results for PRP treatments are individual and vary. An effective, individual treatment plan would take into account your medication and underlying diagnosis into account. The preparation for PRP treatment also varies between clinics. However, Like most things to do with hair, consistency and time help produce results. So consistency in engaging with good treatment practice will help produce good results. So I wouldn't worry just discuss all your current medication, concerns and treatment goals with your doctor.