I have continuous dizziness / lightheadedness. Is it possible that it's because of my antidepressant?

Yes, it is possible that the dizziness and lightheadedness you are experiencing could be due to your antidepressant medication. It is important to consult with your doctor and pharmacist to discuss the possibility of stopping the medication for a few days to see if the symptoms improve. If the dizziness subsides after stopping the medication and returns when you resume taking it, then it is likely that the medication is the cause of your dizziness. It is always best to consult with healthcare professionals before making any changes to your medication regimen.