No libido

Patient: I have been taking sertraline 100 mg a day for 2 mth due to depression. All is going well but I gave no libido left. I cannot have an orgasm but i always could before the sertraline. It is causing me and my husband problems between us. I have read that zyban should help but it is only sold for giving up smokingIn the uk. What else can I be prescribed as an add on medication. I feel the sertraline is working and don’t want to change.