hi. i think 450 is the usual maximum. when wellbutrin first hit the market, higher doses were common, but...those higher doses=a higher rate of drug-induced seizures. ugh.

"augmenting," or adding a drug to one you're already taking, is fairly common. ssri drugs can be added if anxiety and obsessive thoughts are a problem. remeron might help if one needs help sleeping, with anxiety, low mood, etc. it really depends.

the only downside to being on wellbutrin is that, as the dose gets higher, the doctor has to be more cautious about any additional drugs, because of drug-drug interactions, the potential for seizures, etc. that seems to be why most people who take wellbutrin with another antidepressant take something newer--an ssri, remeron, now and then effexor or cymbalta--versus a tca.

depending on the nature of your problems, something just to calm you down might help. gabapentin, lyrica, maybe a benzodiazepine (long term use...can be a problem...).

hope this helps.