Question: What is the effect of depression (and antidepressant medication use) on sexual functioning?
Answer: Well one of the main causes of sexual dysfunction is actually depression itself. Studies have shown that people who are in an episode of depression often have a decreased interest in sex, decreased libido, and in men -- problems getting an erection. So we know that depression can do that.
Unfortunately, also, some people have sexual dysfunction side effects from the antidepressant medication -- most commonly decrease in libido, but also delay in orgasm or delay in ejaculation has been described.
Because both depression and antidepressant medications can affect sexual functioning, if one has sexual dysfunction problems it's very important for people to tell their doctor about this before the doctor treats them with a medication.