Hey, this might be nothing but my frog seems sluggish even for a dumpy. Do frogs normally sleep day and night after being treated?

I've dosed Bonk with metinozole(spelling?) for four days. The vet said he had a lot of protozoa. For two days afterwards, I've noticed that he's hidden, staying in the same place. I know he might be moving around at night, but I really doubt it since I normally catch him moving when I get up at night. He's eaten, but very reluctantly. It's not that he's being overfed, I've skipped two days between feedings.

If you think it might be something serious, I'll answer a 'trouble in the terrarium' questionnaire although my camera's dead so I can't provide pictures.

EDIT: He croaked last night but it sounded weak and soft compared to his usual sound.