The instruments and techniques used to prevent an unwanted pregnancy are birth control. No contraceptive method is not 100% effective, easy to use, readily reversible and without any side effects. Each of these has advantages and disadvantages. Paramount importance is the health of the woman's age, lifestyle, the family situation for the selection of the appropriate method therefor. Mechanical contraceptives The male condom is easy to use, inexpensive, readily available and also very important, profyllasei the spread of sexually transmitted diseases. The female condom is applied in the vagina and covers the perineo.Einai awkward, unwieldy is also the diaphragm and the cervical cap, which fits tightly in the neck should be removed several hours after intercourse and is always accompanied by concomitant use of spermicides. Spermicides are available without prescription as foams, creams or suppositories. Many couples do not tolerate their use. The IUDs commonly spiral is useful in women with a low risk of being exposed to sexually transmitted diseases. The contraceptive activity lasts 5 years, their placement is done by the gynecologist, preferably the last days of emminorysias.Synitheis side effects is the increased amount of menstrual blood and dysmenorrhea in glomeruli bearing copper while the mirena, glomerulus with progesterone reduces blood flow and cramps, subject however, because of hormone containing the general restrictions on the use of hormones. Hormonal methods of contraception Combined oral contraception commonly known as 'pill' contains a combination of estrogen and progestogen able to block an upcoming egkymosyni.To first tablet is taken the day of commencement of menses and continued once daily at the same time for 21 days, followed by 7 tablet-free days during which the woman feels unwell. An additional form of contraception (eg condoms) should be used in the first month, when the tablets are not fully protective. Benefits of using them is the reduction of pain and the amount of menstrual blood. Reduce the incidence of cysts in the ovaries and breasts and the risk of endometrial cancer and ovarian cancer. They allow full programming cycle. Disadvantages the nausea that can occur, headache, increased blood pressure, weight gain, pain in the breast. A big question has arisen in connection with "hormonal contraception and breast cancer." Absolute contraindications for their use are thromboembolic disease, chronic liver disease, metrorrhagia of unknown etiology, pregnancy, tumors that respond to estrogen. Related contraindications are non-smoking women over 35 years, migraine, heart disease and diabetes. Other forms of hormonal contraception is long lasting injectable form, intramuscular injection every 12 weeks, and the subcutaneous implants which are placed beneath the skin of the upper arm. They have five years duration. Removing them requires more time since their introduction and is slightly uncomfortable because of fibrosis has occurred. Unreliable contraceptive methods is the method of calculating the fertile days, the interruption of intercourse, wash after intercourse and prolonged breastfeeding with high failure rates. Emergency contraception after intercourse or tablet the next day Able to reduce the risk of pregnancy in women who came in unprotected sex or unsuccessful precautionary manner by 85%. As directly after risky sex become the receipt, the greater its effectiveness, must be taken no later than 72 hours from the time of intercourse having the greatest efficacy if taken within the first 24 hours. It is important to stress that it should not be used routinely as a means of contraception because it contains hormones at very high dose.