Hormonal Methods of Contraception

The second method of birth control to be tackled is the Hormonal Method.

What is the "Hormonal Method" of birth control?
The Hormonal Method or the Combined Oral Contraceptive Pill contains two hormones - oestrogen and profesterone that affect your body and stop it from becoming pregnant. Essentially the hormones in the Pill stop your ovaries from releasing eggs, they also cause your cervical mucus to be thicker inhibiting sperm movement.

It's advantages are: it does not inhibit sensation or spontaneity of sex and it is highly effective if taken properly (every day at roughly the same time). On the other hand, it's disadvantages are:it interferes with the females natural hormonal system; if taken for long periods of time it can affect fertility; it can take a long time for your natural cycle to re-establish after coming off the pill; you can experience side effects like nausea, bloating, spotting and breakthrough bleeding, irritability, weight gain and less sexual desire; it does not protect against STD's; and it needs to be prescribed by doctor.


What is the Mini Pill?
The Mini Pill is a progesterone only pill. It works by thickening cervical mucus (making it hostile to sperm) and changing the uterine or womb lining so that fertilized eggs cannot implant. The mini pill does not stop ovulation.

Injections
Progesterone Only Injections or DMPA are often better known by these trade names - Depo -Provera or Depo Ralovera. DMPA standa for "depomedroxyprogesterone acetate" , it is a liquid which contains the hormone progesterone which is similar to the hormone found inthe Pill.

DMPA is injected into the female body to provide longer term protection against pregnancy. DMPA stops the ovaries releasing eggs and makes the cervial mucus thick and hostile to sperm.

It's advantages are: you don't have to remember to take pills every day; it is highly effective - only a 0.1 -0.6 failure rate; and it only lasts for 3 months. While, it's disadvantages are: you have to be injected; it has no protection against STD's; it affects your bodies natural hormonal system; it has side effects can include irregular periods which may stop altogether, headaches and weight gain; any hormonal contraception can adversely affect fertility, when and if you decide you want to get pregnant, it is difficult to predict how long it will take to get the DMPA out of your system and how soon you will cycle naturally and conceive.

  
Implants
Implants work in a similar fashion to injection. It is a small plastic rod or set of rods containing hormones that are inserted beneath the skin in females.
Advantages:

• last for up to 3 years
• effective

Disadvantages: As for Injection method, with the added disadvantage that you really don't want to choose this option if you plan to be pregnant in the next 3 years or so. The implant can be removed at any time, but as with injections it is very difficult or predict how long it takes to get the hormones out of your system to cycle naturally and conceive quickly.

 Source: Here