Its one of many anti-depressants and works differently for different people but HelterSkelter1, its certainly one of the best for least side effects.
Some anti depressants have a "Get up and go' effect, which isnt good for people with high levels of anxiety:
other antidepressants are prescribed for people who have depression with anxiety.
Most drugs taken for physical illnesses have side effects, sometimes worse. You live with them because it is the lesser of two evils. she people only need it for a short time, it gives the mind a break to sort itself out: others need them long term.
My advice is simply to google it. Go for the NHS website
www.nhs.uk/medicines/sertraline/
Dry mouth is very common indeed, you need to drink a lot of water.