Different AAS have different effects on neurotransmitters and AAS tend to have anti-depressant effects. One effect of adding an AAS to an SSRI is offsetting the negative effects of the SSRI on libido. Other interactions are possible depending on your particular problem. Hypomania, panic, anxiety and insomnia are all possibilites.
I know of one female that had used winny, then switched to nandrolone while on Paxil. The AAS gave her more energy and offset the negative effects of Paxil on her sex drive. The Paxil was for anxiety, but made her chronically tired and sleepy. She noted no other negative interactions.
W6