In PoA, the Wolfsbane Potion is made by Snape for Lupin during Lupin's stay at Hogwarts. But what does Lupin do without drinking the potion? This applies to after he leaves Hogwarts as a student (when he was supposed to transform in the Shrieking Shack) up to PoA and during OotP-HBP. I suppose it depends on where he's living, but he can't possibly just allow himself to turn into a monster once a month and run wild. Especially in OotP, when he's living in 12 Grimmauld Place, which is in the middle of London.

Maybe he goes somewhere every month for the full moon where there aren't many people, such as a forest, etc. What do you think?