The hormonal shot
The hormonal shot consists of an injection containing the progestogen hormone once every 12 or 13 weeks. It works in the same way as a contraceptive implant.
The first injection is often given during the first 5 days of the menstruation, so that you are protected immediately. The second injection follows after 10 weeks already. After that, your doctor gives you a new injection every 12 or 13 weeks.
During the first months, there is a chance of irregular vaginal blood loss. In due course, menstruation can disappear. This is not serious: menstruation will start again after the contraceptive implant has been removed.
Methods containing only progestogen do not create any additional risk for thrombosis (clotting in the circulatory system) or for heart or vascular diseases.