Apothecarrow

This arrow's tip is a razor sharp head full of restorative ointments and herbs

A creature hit by this arrow regains 6d4 hit points (after taking the initial weapon damage)

If the creature is blinded, charmed, deafened, frightened or poisoned it can immediately repeat the saving throw of one of them (against the original DC). 

If the creature is diseased it has advantage on the next saving throw it makes against it in the next 24 hours