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Birth control

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Introduction

Birth control

Birth control is a regimen of one or more actions, devices, or medications followed in order to deliberately prevent or reduce the likelihood of a woman giving birth or becoming pregnant. Methods and intentions typically termed birth control may be considered a pivotal ingredient to family planning. Mechanisms which are intended to reduce the likelihood of the fertilisation of an ovum by a spermatozoon may more specifically be referred to as contraception. Contraception differs from abortion in that the former prevents fertilization, while the latter terminates an already established pregnancy. Methods of birth control which may prevent the implantation of an embryoif fertilization

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Middle

diaphragm fits into place behind the woman's pubic bone and has a firm but flexible ring, which helps it press against the vaginal walls. The contraceptive sponge has a depression to hold it in place over the cervix.

Hormonal methods

Ortho Tri-cyclen, a brand of oral contraceptive, in a dial dispenser.

There are variety of delivery methods for hormonal contraception.

Combinations of synthetic estrogen and progestins (synthetic forms of progesterone) are commonly used. These include the combined oral contraceptive pill ("The Pill"), the Patch, the vaginal ring, and Lunelle (a monthly injection not currently available for sale).

Other methods contain only progesterone or a progestin. These include the progesterone only pill (POP, minipill), Depo Provera

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Conclusion

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Classification

Agents that enhance ovarian activity can be classified as follows.

  1. Gonadotropin releasing hormone
  1. GnRH
  2. GnRH agonists (i.e.Lupron ®)
  1. Estrogenantagonists
  1. Clomiphene citrate (actually a SERM)
  2. Aromatase inhibitors
  1. Gonadotropins
  1. Urinary gonadotropins (menotropins)
  1. Pergonal ®
  2. Prurified menotropins (Bravelle ®, Menopur ®)
  1. Recombinant gonadotropins
  1. Follicle-stimulating hormone (Follistim ®, Gonal F ®)
  2. Luteinizing hormone (Luveris ®)
  1. Human chorionic gonadotropin (hCG)
  1. Urinary hCG (Profasi ®, Novadrel ®)
  2. Recombinant hCG (Ovidrel ®)

Estrogen antagonists and gonadotropins may stimulate multiple follicles and other ovarian hormones leading to multiple birth and possible ovarian hyperstimulation syndrome.

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