The medical examination fee is around 600 yen. The cost of the medicine varies depending on the day.
ご質問ありがとうございます。
"The medical examination fee is around 600 yen."＝「診察代は600円ほどです。」
"The cost of the medicine varies depending on the day."＝「薬代はその日によって変わります。」
追加: "It's not only the medical examination fee you have to pay for. The medicine also costs something."＝「診察代だけではない。薬にもお金がかかるのだ。」
ご参考に。
アメリカ合衆国 
