This is hopefully only a localised problem! (My daughter) She is prone to ear infections and picked one up two years ago in San Steph (she spent most of the daylight hours in the pool) and we nearly couldn't fly home. Last year she picked up ANOTHER one. BUT we'd taken some antibiotics "just in case". Our family doctor was very understanding and prescribed them before we left. This meant that when she complained of earache we didn't have to make the suicidal drive in the back of the doctors car to Sidari and then get a taxi back just to pick up some tablets.
A chemist in San Steph could be a nice business venture for any entrepreneurs out there.
In the meantime, take your own medication.
And if someone HAS opened a chemist there in the meantime then... I feel a real twonk.