So it's important not to think of caffeine drinks like coffee, tea and cola as good thirst quenchers. If you drink cofee tea and cola, it's also important to drink plenty of water as well, especially in hot weather and before and after exercise. It can do. Taken before bedtime, it can make it harder for some people to get to sleep. It can also make you sleep less soundly.
Many drugs can affect an unborn baby.
Some studies have found links between very large doses of caffeine and miscarriage, premature birth and stillbirth. But this isn't a problem for women who have moderate amounts of caffeine in pregnancy. Doctors now recommend pregnant women have no more than 200mg of caffeine a day. This is about two to four cups of coffee or tea daily - the table below can help you work out how much caffeine you have each day. For most of us, around two to three cups of brewed coffee or four cups of tea each day is probably okay.