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What is the best date of using marvelon pills ?
marvelon pills are oral contraceptive pills , and the best time to use OCP ( oral contraceptive pills ) is the with the first day of period 
General advices about OCP :
1. take them within the first day of period 
2. its better to take them every day in the same time , preferable at evening time 
3. dont miss you doses , and in case of missing one dose , take it once you remember , unless it the time of next dose , then just take the next dose 
4. dont take 2 pills in the same day
5. its preferable to take OCP medications with doctor supervising 
Common side effects of OCP :
1. stomach pain
2. gain weight
3. headache 
4. mood changes
5. breast pain
6. nuasea 
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Kind Regards