The shot (also known as the Depo-Provera shot) is an injection of progesterone-only agent. It lasts for 3 months and one variable about this is that you have to come in every 3 months to get the shot. Otherwise, the effectiveness will expire.
The birth control pill has been around for many, many years. It is a nice form of birth control if a person can remember to take it every day. That is part of the compliance nature of this birth control to be effective. It requires one to take a pill every day, typically around the same time. Often most pills have a placebo amount of time - typically anywhere from 4 days to 7 days, and that's normally when the person's menstrual cycle will start. There are various types: there are progesterone-only birth control pills that are often given to women that are lactating or breastfeeding, and then most birth control pills include estrogen and progesterone.
The patch is a form of contraception that is placed on the arm. You place the patch on the arm for a week at a time and you use 3 patches in a month's time and then 1 week off and that's when you have your cycle. The side effects of the patch include: some people have an allergy to the adhesive of the patch. Although this is not common, this can occur. The main concern about the patch is that it does have a higher profile risk of blood clot formation compared to all other forms of birth control.
The NuvaRing is a type of hormone therapy that is a plastic ring made of estrogen and progesterone and it is about the size of this circle. You squeeze it and put it in similar to a tampon. It stays in for 3 weeks, then you take it out a week and that's when you have a cycle and you continue that process.
Those at risk for birth control - specifically speaking of hormonal birth control - are those that have a hypercoagulable state. That is, they personally have had a history of a blood clot formation. In particular, we're speaking of deep venous thrombosis and/or pulmonary embolus. That is: blood clots in your extremities, particularly your legs and/or a blood clot in your lungs. Also, people that have hormonal cancers - in particular, some breast cancers and endometrial cancers - typically are not candidates for hormonal birth control.