<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 54 year old boyfriend was put on Prozac for depression and not able to cope with job...it worked wonderfully and made him a different person. After several months sexual dysfunction appeared, the doctor switched him to Zoloft, that didn t work for the dysfunction and the wonderful feeling seemed to go away and couldn t sleep so he cut the pills in half. The doctor then switched him to Wellbutrin and don t know how that is going as he became quite agitated and became unsocial and un-talkative. Don t know how to help him because he keeps things inside that I might be able to help with. I have been on antidepressants for years and know you can t switch from one to another, stop taking them, start again then cut them in half. He is 6 3 and weights 240 pounds. What can he do?  <response>: Hello, Thanks for choosing Chat Doctor for posting your query. I have gone through your question in detail and I can understand what you are going through. Welbutrin can cause anxiety symptoms initially. Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, you can use the below-mentioned link:bit.ly Chat Doctor. 