Tentatively schedule antibiotic I left out (in different places) (6,2)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

PEN [i] CIL [l] IN (an antibiotic), with the first I taken out, and (in a different place) an L (abbreviation for left) also taken out. To put something into a diary with the understanding that it might get taken out again if plans change.