The medicine that you get from a hospital usually works well.
The medicine that a doctor at a hospital prescribes is quite effective.
ーThe medicine that you get from a hospital usually works well.
「病院でもらう薬は通常よく効く」
the medicine that you get from a hospital で「病院でもらう薬」
to work well で「よく効く」
ーThe medicine that a doctor at a hospital prescribes is quite effective.
「病院の医者が処方してくれる薬はすごく効力がある」
the medicine that a doctor at a hospital prescribes で「病院の医者が処方してくれる薬」
effective で「効力がある」
ご参考まで！
カナダ 
