Zoloft is designed to help those who suffer from depression, anxiety, or cost of neurontin without dr prescription obsessive compulsive disorder. It is part of a class of drugs called selective serotonin reuptake inhibitors. The mechanism by which Zoloft works is not fully understood although what researchers do know is that it works by increasing the level cost of neurontin without dr prescription serotonin in the brain by inhibiting its breakdown.