Prevention of pregnancy occurs most often by hormonal influence. The effect of the p-pill varies depending on which hormones are used, but most often it is:
• Blocking the ovulation, so that there is no egg to fertilize.
• Change the cervical mucus, so it is impervious to sperm cells.
• Change the cervical mucus, so that the fertilized egg can not get caught.

The most commonly used
hormones that prevent pregnancy: • Combination of the hormones estrogen and gestagen.
• Pills only containing gestagen (mini pills).
• Hormone spiral releasing gestagen.

Combination preparations are most effective as they work on all three of the above methods. The minipillers affect the cervical mucus so it becomes impervious to the sperm cells.
Different generations of contraceptives are distinguished:
• 1st generation includes norethisterone and dienogest.
• 2nd generation includes levonorgestrel, norgestrel, medroxyprogesterone acetate, and norgestimate
• 3rd generation includes desogestrel, gestoden.
• 4th generation includes drospirenone.

It is recommended by the Health Board to start with a 2nd generation pill, as the risk of having a blood clot is lowest in this generation. Blood clots are the biggest side effect / risk of taking birth control pills, so you should pay special attention in the first year of birth control. However, the risk of getting a blood clot is not much higher than normal. Studies show that among women who do not take birth control pills, there are 5-10 women per 100,000 who get blood clots a year. Among women taking 1st and 2nd generation birth control pills, there are 20 women per 100,000 who get blood clots, and among women taking 3rd and 4th generation birth control pills, there are 40 women per 100,000 who get blood clots.

Replacement of preparation
If you need to change the generation of the pill, it is recommended that you go straight to the new preparation without a break from the old preparation. Pause may be required if necessary but at most in the time recommended in the old preparation.

Forgotten to take birth control pills
Generally, for solid hormone dosage formulations in all tablets,
a forgotten tablet should be taken immediately if it is within 12 hours. If more than one tablet is forgotten, only the last forgotten tablet is taken and you continue the pack and hold the scheduled break. You are not protected from pregnancy if you have missed a dose, and extra contraception should be used at least the next 7 days. If there are less than 7 tablets left in a 3 week pack, the scheduled break will be skipped and will be delayed immediately with the new period. However, it is always recommended to read the package leaflet on the individual preparation to ensure the procedure.
If there is a different concentration of hormones in the tablets, it is recommended that you read the package leaflet as the procedure may vary.
If in doubt, contact your pharmacist or your doctor.

Pregnancy and breastfeeding
After pregnancy, it should take 6 weeks before restarting the pill. This is due to the fact that the pills can affect milk formation, thus producing no more milk. If you experience a high effect on milk formation, you can stop taking the pill and milk formation should normalize.

Pills are only available on prescription from your doctor.

Read how to find out if the pharmacy has received a prescription from your doctor