I Have Been Taking 100mg Wellbutrin For The Last Few

I have been taking 100mg Wellbutrin for the last few years with very acceptable results. At the moment my depression has returned similar to how it was before mI started the medication. I feel sure it is a bit of an anomaly and undoubtedly will pass. However I would really appreciated a medicationreal timely response from the medication. Is it ok if I take a second pill today? I took the regular dose about three hours ago.