As far as I remember, the doctor fees are as follows:
Weekdays day time - $120
Weekdays night time - $180 (but not sure)
Sunday / Public holiday day time - $180
Sunday / Public holiday night time - $280
Of course you need to pay additional for the medicine. My daughter just went yesterday afternoon. Total charge is $180. $120 doctor's fee and $60 for medicine. It includes 3 kinds of medicine for 5 days.