I recently purchased Enzyte and haven't started taking it yet. I also have Cialis which works pretty well for me but causes terrible headaches and is very expensive. I have heard that you have to take Enzyte for a while before noticing results (if any). Does anyone know if it is okay to continue taking Cialis for a couple of weeks when I first start the Enzyte?

Yes Cialis does cause some awlful headaches doesn't it.
There is a couple over the counter products I have found works as good as Cialis but they cause the headaches also.

They don't work the same way, it should not cause any problems.