Assalamu alaikum Ustadh. A person with istihadah for years starts taking a new medication and she thinks she might continue to be impure past 15 days but she's unsure (As the medicine is new). Should she wait 15 days to be sure,Or do what she did when she had istihadah?

Ustadh AbdulAziz al-Haqqan

But with istihadhah u can still pray u only sit for the period of your haydh like 7 days and the rest are istihadhah so u can make ghusl and pray and u make wudhu for every obligatory salah.