Marvelon is a combined oral contraceptive pill that is widely used for birth control. It contains two active ingredients, ethinylestradiol and desogestrel, which are synthetic versions of the naturally occurring female sex hormones, estrogen and progesterone, respectively. Marvelon works by preventing ovulation, making it difficult for sperm to reach an egg, and altering the lining of the uterus to prevent attachment of a fertilized egg. It is typically taken once daily for 21 days followed by a 7-day pill-free period during which a withdrawal bleed, similar to a menstrual period, occurs. Marvelon is also prescribed for managing menstrual disorders or acne in some cases. As with any medication, it is important to consult a healthcare provider before starting Marvelon to ensure it is appropriate for your health condition and to understand potential side effects.