Selective serotonin reuptake inhibitor.

Fluoxetine

It is a re-uptake inhibitor for the dopamine in your body. It is to be Co Administered with a Selective serotonin re-uptake inhibitor to replenish both dopamine and serotonin in your brain. Both, and allot more are found in protein shakes and vitamin/health stores.

Not a good idea, robitussin is a nonselective Serotonin re-uptake inhibitor. They will interact,

Paxil is from SSRI (selective serotonin reuptake inhibitor) class.