Can you take tramadol 3 hours after taking trazodone?

Hi, Abuelo!
There is a risk for a very rare but serious condition. This is the Interaction Report:
https://www.drugs.com/interactions-check.php?drug_list=2221-17957,2228-0
If your doctor prescribed both these medications they have probably judged the benefits to outweigh the risk but you should be aware of any potential symptoms of serotonin syndrome.
You may want to consult your doctor to be sure it's okay.