All Selective serotonin reuptake inhibitor (SSRIs) antidepressants are well known for causing both a loss in libido and what is called in the medical trade 'sexual disfunction' i.e. an inability to either get an erection or ejaculate.
In the USA, this is dealt with by also prescribing the patient a generic drug called 'Bupropion' (brand name 'Wellbutrin') which counteracts the 'sexual dysfunction' side effects of the SSRIs the patient is taking (I know, it is bad enough being depressed, but then not being able to enjoy sex as a side effect form SSRIs - it is almost a cruel joke). Unfortunately in the UK (unlike in the USA), Bupropion is not licensed to be prescribed for the treatment of depression so your doctor cannot give it to you to counteract the 'sexual dysfunction' side effects of SSRIs.
However - your doctor in the UK CAN
prescribe you Bupropion if you need it to help you stop smoking
You can thank me later