Sum up the indications and common side effects for the drugs trazodone and tramadol that you have discovered in your research and the sources.

INDICATION:
Both tramadol and trazodone are prescribed as pain relievers and sleep aid. But the difference is that the tramadol is an opioid, and the trazodone is an antidepressant. They are from different family but they could be used for the same indication.

SIDE EFFECTS:
Tramadol and trazodone may have some side effects but not the same frequency of them, for example, both tramadol and trazodone give nausea but it is more frequent with tramadol than with trazodone.
Trazodone can cause weight gain and tramadol can cause both weight gain or loss.
Trazodone takers can have nightmares and tramadol can have paranoia and hallucinations.