#TDM for #HCQ warns of #toxic #levels in #CRF v low GFR <30, <60, <90, >90   400mg/d all in low GFR toxic   200mg/d 25% in low GFR toxic   6mg/kg/d – low GFR is too ⬆️ adjust HCQ dose for pts with CRF POS0987 #EULAR2025 @RheumNow @eular_org https://t.co/vg2b87LuiE