Low urine output: What could be the cause?

For about the last month now, I’ve barely felt any need to pee—not even in the morning after being asleep all night, just a few drops, I guess. I am drinking plenty of fluids during the day, though. I'm also on some medication for depression, so I was wondering if that might be causing this... maybe?

Check the side effects on the label.
If it keeps up, just go see your doctor. I went through the same thing and they ended up finding a bunch of sediment and tiny stones in my kidney. All that fluid has to go somewhere—check if you're retaining water.

You’re peeing way too much. Seriously, go see a doctor... it could be something with your kidneys or even heart issues. Even if it turns out to be just a side effect from medication, you still need to figure out what the underlying cause is. You have to get checked out. Plus, if you aren't even drinking more than a liter or a liter and a half a day, you should still be putting out at least 600 or 700 ml of urine, let alone if you're actually staying hydrated.