Namaste,
Since you didn't specify what medications you are taking, it's difficult to estimate the time it may take to fully take effect, But as Mr. Green stated it usually takes anywhere from 3-6 weeks for an anti-depressant to tak effect, whereas anti-anxiety medications, depending on which ones can take effect in a matter of days.
If after 4 weeks you're still not seeing any results, I'd contact my provider and let him/her know what your situation is. There is no reason for you to suffer unnecessarily.
But, be patient. I don't know how long you have suffered, but us old pros knows it may take years to find some consistent relief.
Best of luck to you.
Michael
Can take up to 3 weeks depending on the medication. Do your best to hang on in there. Far from easy at the moment for you. But once it does kick in you should be fine.