Hallucinations while smoking weed and taking cymbalta

I've had hallucinations before when taking an SSRI (sertraline). I just recently talked to a psychiatrist about that incident, SSRI-class drugs increase serotonin levels in the brain, which is good if you have low serotonin levels, but if your serotonin levels are already normal or elevated, then on the medication, there is too much serotonin and that excess can have side effects, like hallucinations. Different SSRIs target different chemical inhibitors, so not every medication will have the same effect, I've been tried on half a dozen SSRIs and only experienced hallucinations on the one. So, it is possible that cymbalta or the dose you're taking of it isn't right for you, or that the added effects of cannabis are unbalancing the chemicals in your brain. I agree, though, that hallucinations are not, quote on quote, "normal."