Medicines and their possible side effects affect individual users differently. Not everyone who uses Logynon will experience the possible side effects.The following are the possible side effects of Logynon:Abdominal painNausea or vomitingHeadache or migraineWeight changesBreast enlargement or tendernessWater retentionVaginal thrushChange in menstrual bleedingDepressionMenstrual spotting or breakthrough bleedingDecreased sex driveSkin reactionsRise in blood pressureIrregular brown patches on the skinSteepening of corneal curvature, making wearing of contact lenses uncomfortableLiver problemsGallstoneBlood clots in the blood vessels Logynon should not be used by women with certain medical conditions. Check first with your doctor if it is safe for you to take this medication. It should be used with caution by women who are over 35 years of age or those with a family history of stroke, heart attack, or blood clot. It should also be used with caution by women with certain medical conditions. Check first with your doctor if you need extra monitoring while you are taking Logynon.Logynon is used to prevent pregnancy and should not be used during pregnancy. If you think you could be pregnant while taking the pills, stop taking the pills and consult your doctor right away.The hormones in Logynon can cause a reduction in the production of breast milk. It is recommended that breastfeeding women not use Logynon until after weaning.It is necessary that you share with your doctor a list of all the medications you are currently taking or have recently taken before you start taking Logynon. Similarly, check with your doctor before you start taking a new medication while you are taking Logynon. This is to make sure that the combination of drugs will be safe.