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Seroquel (Quetiapine) and Oxcarbazine (Oxcarbazepine) are indicated in bipolar disorder as both have mood stabilizing properties. Paxil (Paroxetine) and Gabapentine (Gabapentin) are used in anxiety or depression.
As you mentioned that Paxil was used in the highest dose earlier with a difficult withdrawal, now your doctor may be using it for acute bipolar depression and wants to taper him off it as soon as the depressive symptoms clear. He will not have much of withdrawal symptoms as the dose is on the lower side.
It is not uncommon to use two or more mood-stabilizing drugs in bipolar disorder when the person is not responding adequately to one drug. Also, in acute bipolar depression, antidepressants are used in combination with others drugs to treat it.
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