Everything in a pharmacy is rated. S1 is general stuff on the
floor like toothpaste, or sunscreen ect. S2 is medicine that is
technically supposed to be behind the back counter, or in close
view of it. This is like Panadol, eye drops, cough and cold ect
then there's S3, S4 and S3R which is pharmacist only, or scripts.
Hope this helps :)